Cylinder 4 sti 2009, 15k miles, cai, turbo inlet, 20g, dw750's, walbro, 3" exhaust, tgv deletes (grimm), phenolics, fmic, etc. Ships worldwide! Mar 1, 2017 · Cylinder 4 (misfire) Check Engine Light randomly, BUT light went away-- As it says. Drove it 3 hours, temperatures were fine. 5L firing order is 1-3-2-4 which is a unique firing pattern for this engine. Nov 10, 2020 · Buy Cylinder 4 Chamber Cooling System Compatible with Subaru WRX/STI/FXT/LGT by GetaDomTune: Accessories - Amazon. Easy 30mins job. 5 litre, double overhead camshaft 4 cylinder with 4 valves per cylinder. Jan 19, 2017 · I'm getting misfire codes on all 4 cylinders. It is a pretty easy install. Picked up the car bone stock a few months ago and since then ive thrown on a few parts from my previous sti (downpipe, cobb sf intake, and stage 2 AP reflash). 5L 2006-2015 By REPS312505 at Walmart. Nov 10, 2021 · Anyone made their own cyl 4 cooling mod? Factory 2. 5L Turbo) Any MOD 4 will wok it taps into coolant line near the heater core what this does is supply coolant to cylinder 4 which is the last in the cooling system by doing this the heat on it comes closer to the other 3 in temperature thus reducing knock the hotter the cylinders the more prone you are to blow a ring land, I understand why other forums Nov 6, 2023 · Subaru 2. Not looking for speed, just want the car Here, you are looking at the Torque Solution Cylinder 4 Coolant Mod. Bought a access port May 29, 2019 · In 2004, Subaru said: "The 2. Installing this mod will increase coolant flow around the left side head. I reset my ECU and the car ran fine until the next day (about 70 miles later) when the code popped up again. Improving the coolant's flow improves reliability by reducing detonation causing hot spots. Until now, STi-badged Subaru vehicles had been available only in select world markets. Simple, yet effective. This helps reduce knock and detonation in cylinder #4, which is known to cause the dreaded EJ ringland Oct 21, 2010 · which cylinder is #4 on an ej25? Factory 2. Torque Solution Cylinder 4 Coolant Mod for Subaru EJ Engines was designed to increase coolant flow to cylinder #4 head area. Mar 19, 2012 · Are knock sums for each cylinder supposed to be at zero? Because I looked at the knock sums cyl 1 was 3 cyl 2 was 7? Aren't the values for knock always supposed to be zero? Sry if its a newb question. About a month ago i threw a P304 (miss fire cylinder #4) thought it might just need new plugs so I replaced them and she ran fine. Great for WRX STI enthusiasts seeking a "drop-in" engine package. Cylinder number four, being furthest from the primary coolant source, tends to run hotter than the others. Going to be sticking with the stock turbo but converting to top feed injectors. No symptoms, but #4 is at 90 psi so I'd rather rebuild now before it calls for even more work later. 5L Impreza WRX STI 4 Cyl 2. Billet fittings are fixed in place onto quality coolant hose with genuine Knock is detected from cylinder 4, which is the hottest cylinder. I also managed to get a compression test done: #1 - 148 #2 - 141 #3 - 149 #4 - 150 So cylinder #2 is a little lower than the others, but still looks in the good range to me. The engine had DOCH cylinder heads, 16 valves and based on semi-closed cylinder block (2004-2006 EJ257 shared the same EJ255 block). Contact me if you have any questions about this awesome Subaru WRX STI. This unfortunately required me to remove Jun 11, 2024 · I have tried looking everywhere but couldn't find anything. Nov 22, 2019 · So I did a compression test. I can’t find too much info on how much this actually helps. Like where is #1,2,3,4? The manual uses the perspective like you are sitting in the car facing forward. Any ideas on what it could be? I run shell 91 octane (Hard Got the cylinder 4 cooling mod installed In my Subaru STI today, so we don't gotta worry about cooking cylinder 4 anymore!! Before I built the engine in this Jan 13, 2025 · Subaru STI Cylinder 4 Reverse Cooling Mod | COMPLETE & DETAILED INSTALLATION | Installation of the Cylinder 4 Reverse Cooling Mod on an STI | GetaDOMTUNE |. I can understand one cylinder being low, but two, on the same side and with the same low pressure?. If you think t Nov 12, 2008 · I just dealt with the same issue on my 05 STi - pesky 4 cyl misfire. This mod doesnt make the it so cyl 4 wont have a problem. Once or twice a week an individual posts about having a misfire Jan 12, 2017 · Misfire in cylinder 4 (P0304 + PFFFE) Factory 2. 0 liter, base, no mods. Applicable to any hydraulic assisted Subaru and other potential makes. took it around the block and pulled back into my shop and Jun 1, 2020 · My friend had to sell his STI because literaly everytime he got in it he turned into a dangerous/bad driver, tickets and close calls, $10,000 fixing parts on a $30,000 car in 2 years. Welcome to another episode of our 400hp Built Not Bought series! In this video, we dive into the installation of the GDT Cylinder 4 Cooling Mod on my 2019 Su Jun 22, 2021 · Drove my 2016 STI with 63K miles to a reputable tuner shop and had a compression test done. I'm willing to be that if he had the coolant passing through the head, like it really should, he would not have had the rings butt. The result of this reduced efficiency? In some cases, carbon 2011 WRX STI Cylinder 4 cooling mod installed end of February, went to a tuner shop and they checked compression and said cylinder 4 was at 86, 1-3 were at 150’s A week ago I checked all fluids after bringing the car home, oil was fine, coolant from radiator was fine, overflow was empty, and turbo coolant reservoir was also empty. Hey all, Took my first “long” road trip in my STI to Texas on Thursday for work (~5 hours one way). You could try swapping the injectors, plugs, and coil packs from cyl #2 to #4 and see if the misfire follows. Stopped, checked the gas cap, everything was ok. The result of this reduced efficiency? In some cases, carbon Dec 7, 2011 · 2011 STI and Cylinder 4 Factory 2. Mar 17, 2019 · These higher cylinder temps also come into play as Subaru decided to locate the knock sensor nearest to cylinder 4 for this very reason. I checked the codes and got misfire cylinder 4 and ignition coil D issue. So leak down test, and noticed that 2&4 are lossing pressure and can only hear it through the rocker cover breathers. com FREE DELIVERY possible on eligible purchases Jan 1, 2023 · Anytime I see Cylinder 4 on sti's it's 90 percent stories about Ringlands failed. #1 ~125psi #2 ~118psi #3 ~127psi #4 ~115psi Is there any cause for concern? Main reason for doing the test is the oil usage is a quart per ~1500 miles, do drive it very hard though. Cylinders 1&3 130psi. 2) Inspect spark plugs - swap between 2 and 4 3) Swap injectors between 2 and 4 4) Compression test (and hope for the best) My cause was a faulty injector. With all the logic and science behind it just makes sense. 5L Turbo) Cylinder 4 Coolant Mod for Subaru EJ Engines was designed to increase coolant flow to cylinder #4 head area. Nov 21, 2016 · I have a 2006 sti with 80k miles. For Subaru STI 2004-2020. She was stock when I bought her, a month later the first cylinder 1 misfire occured, I got a new coil pack and spark plug put in. --This kit balances the coolant flow by diverting it from the head to the heater core lines, reducing knock and ringland failure risks. Cylinder 4 Cooling Mod | 2008+ Subaru WRX STi Adrian Morse 2. 5L Turbo) I have 58k on my 2019 STI and haven't done the mod and have no desire to do it. The next day, as I was about to head home that evening, I got a misfire code about 2 minutes after a cold start. This unit has an output of 305 bhp (309 PS/227 kW) of power at 6000 rpm, and maximum torque of 393 N·m (290 lb·ft/40. -ran an injector cleaner -secondary air injection system removed May 11, 2009 · Yeah I plan on replacing my fuel filter some time soon, want to prevent any further possible injector problems. Learn what Cylinder 4 Misfire Detected means, location and how to repair. Technicnally it may make cyl 4 less prone to detonation under extrememe high temps but that would be under extreme conditions. I'd swap the coils around, but I can't get to those. Mods: Cobb SF intake Cobb catted DP Fuel pressure regulator Stage 2 e-tune from Torqued Performance Any ideas as What is up guys? In this video I show you how to install Dominic's Cylinder 4 Cooling Mod. Sep 21, 2014 · Re: 2013 STi Cobb Stg2 P0304 Cylinder 4 missfire Only way you are going to do this is learning how to read logs and knowing what variables you need to watch. I always let my car warm up before giving any sort of high boost. Going with forged internals. It wasnt designed for that. Turns out it was a bad stock injector on number 4. would anyone know how much it would cost to fix this? What is the EJ205/EJ207/EJ20G Engine? Is it good or bad? Read about Subaru EJ205/EJ207/EJ20G Engine design and features, its the most common problems and relaibility. This is a step by step guide so, no more excuses! I go over the theory of how it works, the completed & detailed Oct 28, 2010 · This is not a thread for posting your own misfire problem! Please start your own thread in the General Maintenance & Troubleshooting forum. I have the '05 factory service manual, and I don't find where the cylinder positions are defined. 0:1. BUT I want to take care of my current problem, the misfire. 2 and cleared the code. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many Mar 8, 2011 · knock sum AccessPortWelcome to the NASIOC. As the beating heart of Subaru's flagship WRX STI models, the EJ257 engine has powered countless motorsport victories, street builds, and track monsters. Well yesterday I ran a combustion leak test and it came back with the fluid staying blue and now today I did a Compression test… well cylinders 1-3 all had PSI Rating at 120-130 but cylinder 4 had 50-60. The lon Torque Solution Cylinder 4 Coolant Mod: Subaru EJ EnginesBrowse for more products in the same category as this item: Select Your Car Select Your Car > SUBARU Select Your Car > SUBARU > Impreza WRX STi 2008-2014 Select Your Car > SUBARU > Impreza WRX 2008-2014 Select Your Car > SUBARU > Impreza 2012+ Select Your Car > SUBARU > Impreza 2008-2011 Fluid Delivery (Coolant / Fuel / Oil / Water Well you asked for it so here it is! The GetaDomTune Cylinder 4 Cooling mod. After much struggling, I got the air out of the coolant system. I'd like to learn of any tips or tricks the community has for performing this. For Subaru WRX 2002-2014. 2K views 11 replies 7 participants last post by hhhydeee Mar 10, 2022 H Precision Works Cylinder 4 Coolant Mod Subaru EJ Engines Key Features: Increase flow to cylinder 4 Reduce cylinder 4 temperatures to keep all cylinders temp. Please do feel free to post your own resolution to misfire problems though in this thread. Typically, replacing spark plugs, ignition coils, or fuel injectors can range from $100 to $300 per component, including parts and labor. It recently developed a misfire for cylinder one. This is a 2010 Subaru Impreza with 150k miles. com FREE DELIVERY possible on eligible purchases Cylinder 4 cooling has long been a known issue on the EJ Family of Subaru engines. I will randomly get misfire for Cylinder 4 + Random Misfire (together) and generally just RESET the ECU to clear the code so I don't have an annoying Check Engine light on. Programmable variable power steering assist system. Apr 14, 2024 · The Subaru WRX STI is equipped with a 4-cylinder engine. The engine equipped with AVCS system on the intake camshafts, turbocharger IHI VF48 (1 bar), DBW, and pistons for compression ratio 8. into my commute I threw a CEL. A misfire means that your engine isn’t running as efficiently as it should be: either there’s too much or too little fuel being injected into each cylinder, air is going into the wrong cylinders, or something is blocking the flow of exhaust gases out of the engine. I'd rather do injectors than spark plugs. Each kit contains: 1x Custom machined and anodized […] Jul 31, 2024 · Have an 04 that finally kicked the bucket. com Subaru designed the cooling system to ensure that cylinder #4 ran slightly hotter than the rest of the cylinders, this allowed them to then tune the system so that if knock were to occur is would happen first on cylinder #4. If you think t Buy New Cylinder Head Gasket Compatible With Saab Subaru Forester XT Limited 4 Cyl 2. Apr 20, 2023 · This is a 2015 WRX turbo, 2. Any help is appreciated! Sent from my SAMSUNG-SGH-I897 using Tapatalk Dec 2, 2018 · P0304 Definition: 4’th Cylinder- Misfire Detected 4’th Cylinder P0304 is a cylinder-specific misfire code, meaning only your WRX’s fourth cylinder has a misfire. Subaru sti cylinder 4 cooling mod installation. 5L Turbo 4-Cylinder engine 6-Speed Manual transmission All-Wheel Drive. Jul 2, 2005 · Hi Im inbetween picking a car and I wanted to know how the JDM STi (4 cylinder) compares to the USDM STi? Also if anybody knows any sites that sell performance parts for the 4 cylinder STi please share. I think that cylinder 4 gets the most action due to the stock tune (?). They Explore the detailed engine parts diagram of Subaru STI, including components like pistons, cylinders, crankshafts, and more. 1 - Cylinder 4 Coolant Mod. A 6 speed Aug 29, 2011 · So anyways the car is an 06 sti with 100k miles, and a cylinder 4 misfire code. I am looking for feedback from early adopters. Last week I was on the freeway and my CEL came on and she started sputtering and went into limp mode. Jun 2, 2007 · Swapping injectors is easy too. The lon Torque Solution Cylinder 4 Coolant Mod: Subaru EJ EnginesBrowse for more products in the same category as this item: Select Your Car Select Your Car > SUBARU Select Your Car > SUBARU > Impreza WRX STi 2008-2014 Select Your Car > SUBARU > Impreza WRX 2008-2014 Select Your Car > SUBARU > Impreza 2012+ Select Your Car > SUBARU > Impreza 2008-2011 Fluid Delivery (Coolant / Fuel / Oil / Water Jan 12, 2014 · cylinder number & firing order Vancouver Impreza Club Forum -- VIC NEWLY UPDATED (AGAIN!!, AGAIN!!) Now with 100% more billet aluminum T fitting Industry first DOHC EJ Cylinder 4 Combustion Chamber Cooling kit increases coolant flow in the LH head to improve reliability by reducing detonation causing hot spots, reducing EGT delta and improving overall cooling system performance. New to Subaru, please advise Factory 2. Wires look great (OEM Subaru) and I believe they were changed at 60k but just to double check, I swapped the cylinder 4 wire with cyl. The answer in my opinion is the rings/cracked Jul 26, 2021 · Learn about common problems with Subaru's EJ257 engine in the WRX STI including engine internal failure, caused by performance upgrades. Now all cyls get equal back pressure and exhaust scavenging, so the heat does not build up specifically in cyl4. They came back with a sheet that said all 4 cylinders were at 115psi. IAG's 550 Subaru EJ25 Long Block Packages are a valve cover to valve cover, crate engine. The rest of the mod are listed in one of the pictures. For Subaru Forester XT 2004-2008. I bought it new. Blind-Spot Detection. At JDMuscle, we specialize in delivering high-quality Subaru WRX and WRX STI aftermarket parts, and today, we're here to share deep insights The EJ257 is one more Turbo version specially designed for WRX STI. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features GDT proudly offers the industry's first Subaru DOHC EJ Cylinder 4 Combustion Chamber Cooling kit that increases coolant flow in the left-hand cylinder head. nipponpower. I will be adding a catch can eventually though. Cylinder 4 Coolant Mod for Subaru EJ Engines was designed to increase coolant flow to cylinder #4 head area. I also added an aftermarket radiator and an AOS. The answer in my opinion is the rings/cracked I’m looking into making my EJ more reliable on my sti and the cylinder 4 cooling mod is what the local shop suggests. This is on my 2005 WRX STI, but it Jul 10, 2025 · All EJ20 / EJ25 engines. Pretty easy with YouTube videos and such for a newb? Step by step guide on how to install the Getadomtune cylinder 4 cooling mod! I hope this video is clear enough on how to get this done yourself! The install Jun 15, 2020 · Variety of Cylinder 4 Cooling System Kits Factory 2. Maybe there are some tuners or track-day junkies out there that have firsthand experience with the before & after results of this kit. I have about 73k miles on my car, and had not Jun 30, 2013 · You can also mention that if two adjacent cylinders (1 and 3, or 2 and 4 on our specific motors) both have low compression, its most likely from a leaking head gasket between the two cylinders. I've installed a catch May 11, 2025 · This modification addresses a known issue in Subaru Tecnica International (STI) engines, specifically the uneven temperature distribution across the cylinders. Leather Heated Seats. Then I went back to add an EBCS. For Subaru Legacy GT 2005-2009. When I got it back, first thing I noticed was the ground to the bellhousing wasn’t bolted down, fixed that and thought all was well then started noticing this miss… The odd thing Sep 7, 2024 · The cost of repairing a cylinder 4 misfire in a Subaru can vary depending on the specific cause of the issue and the labor rates in your area. Pass mods by previous owner was a cat back self weld job and a protune by a well known Subbie tuner. Installation of the Cylinder 4 Reverse Cooling Mod on an STI | GetaDOMTUNE |. Mods 750 injectors Aem fuel pump Cobb intake Cobb turbo back And stage 3 ots been running the map for only a day as all these parts Well you asked for it so here it is! The GetaDomTune Cylinder 4 Cooling mod. Last summer before storage I had a misfire in cylinder 1 and cylinder 4 after doing a pull. Meaning it will knock before the other 3, by cooling cylinder 4 down you’re taking away that protection, and all cylinders will be knocking instead of just 1 before the engine pulls timing. Mar 9, 2022 · Is cylinder 4 cooling mods must have for stock car? If so do I need tune for it and how about factory warranty Jump to Latest 5. Out of the blue I got a CEL, code P0304 (cylinder 4 misfire). I Have a 2012 STI with around 141xxxkm on it. Seeing how my misfire in cylinder 2 followed the injector to cylinder 4, it's a pretty safe bet that's what the current issue is. May 29, 2021 · Cylinder 2 rings were warped and cylinder 4 rings were broke. com Donate: / sti Instagram @JOTAJOTA_STI Amazon Associate (Paid How To Install A Cylinder 4 Cooling Mod On A Subaru STI | GETADOMTUNE | + GIVEAWAY WINNER Step by step guide on how to install the Getadomtune cylinder 4 cooling mod! I hope this video is clear enough on how to get this done yourself! The install is not that hard to do at all, and can be accomplished in your own garage/driveway. 67K subscribers Subscribed. 5L Impreza WRX STI Special Edition 4 Cyl 2. It is the most powerful 4-cylinder engine available in the US. It's my daily driver and doesn't have an AOS or catch can yet either. Is there anything I should look at before I start buying random parts. Hi I'm a little desperate because I need to drive my car today. com Aug 14, 2014 · Has anyone purchased a cooling kit for Cylinder 4 chamber? Seems to be a clever idea as it offers a solution to a known engine issue due to higher detonation risk in #4 chamber, and the install seems straightforward too. I'm planning to install IAG v3 street series AOS & getadometune cylinder 4 cooling mod on my sti 21. Not a whole lot of tools you guys need. This helps reduce knock and detonation in cylinder #4, which is known to cause the dreaded EJ ringland failure Subaru sti cylinder 4 cooling mod installation. 5L Turbo) Torque Solution Cylinder 4 Coolant Mod for Subaru EJ Engines was designed to increase coolant flow to cylinder #4 head area. The engine is a raw1 about 6months The cylinder 4 cooling mod is definitely a must have for any STi owner. The car has been: -Pressure tested/Smoke tested -Compression tested (145psi across all 4 on cold motor) -changed plugs. Another/different sign of a leaky HG is when doing a leakdown test, if you take off the rad cap and see bubbles forming, its from the compression (air) leaking past the HG, into the coolant jackets. And the knock sensor is in that cylinder which prevents proper cooling? Can someone explain this like I’m an idiot and maybe also suggest Cylinder 4 Cooling Mod and Radiator Install by WRXperts! (2017 WRX STI) #jotajotasti #jotajota #cylinder4coolingmod www. The success of the WRX prompted strong demand from American consumers 2 days ago · 2. . The kit is designed to fit all EJ20 / EJ25 2002-14 WRX, 2004-2021 STI, 2004-08 Forester XT, and 2005-09 Legacy GT. This disparity can lead to localized hotspots, increasing the risk of detonation, pre-ignition, and ultimately, engine failure 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021 Subaru Legacy, Outback, STI, WRX on PLM Subaru Jan 27, 2025 · Fit for： All EJ20 / EJ25 engines 2002 - 2014 Subaru WRX 2004 - 2020 Subaru STI 2004 - 2008 Subaru Forester XT 2005 - 2009 Subaru Legacy GT. The kit also includes a Mar 28, 2010 · I'm looking into buying an Sti in the near future and I found one in my price range but it has 109k miles. What This automobile has a 4 door saloon (sedan) type body with a front positioned engine powering all four wheels. Buy New Cylinder Head Gasket Compatible With Saab Subaru Forester XT Limited 4 Cyl 2. Premium Sound with SiriusXM. If cylinder 4 isn't knocking than the other 3 cylinders must be fine. Alloy Wheels. What do you guys The Torque Solution cylinder 4 coolant mod for 02-14 WRX and 2004-2021 STi was designed to increase coolant flow to the cylinder #4 head area. Other four-cylinder engines usually have a firing order of 1-3-4-2, so this one is pretty specific. It just seems a little odd that all 4 are misfiring. The kit also includes a metal "T" fitting and worm clamps. However, 2&4 both at 70 psi. You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. Do the following to troubleshoot: 1) Swap coils between 2 and 4 cyl - see the the misfire follows. 5L Turbo) Apr 28, 2024 · Bevinsee Cylinder 4 Coolant Mod Kit Compatible with Subaru FXT WRX STI LGT For EJ25/EJ20 Engines 2002-2020 4-Chamber Coolant Module Water Hose Adapter Black Aug 1, 2009 · This seems simple, but I want to be sure I have it right. Specifically, it features the Subaru Technica International tuned EJ257 4-cylinder engine. This is all on a 2017 WRX STI. This is a step by step guide so, no more excuses! I go over the theory of how it works, the completed & detailed installation, and offer tons of tips and info along the way. Honestly this was much easier than I thought that this install would be. He did a compression test and the results came back as cyl 1 140, cyl 2 125, cyl 3 135, cyl 4 130 So I just bought a 2013 Subaru STI and after a couple of days I had a misfire in cylinder 4. Each kit includes an assembled hose kit that features a high-grade silicone hose and custom machined 6061 anodized fitting. This modification has been designed to increase the coolant flow to the cylinder number 4 head area. - Subaru WRX STI 2004-2020. 5L Turbo Powertrain (EJ Series Factory 2. Sep 15, 2007 · im looking to purchase a 07 sti and its at an extremely good price, but it is because (cylinder 4 misfires). Buy Torque Solution Cylinder 4 Coolant Mod 2002-2014 WRX / 2004-2021 STI / 2004-2008 Forester XT / 2005-2009 Legacy GT, a Cooling Modifications by Torque Solution, for only $76. 5L firing order Before we get into any details, it’s crucial to state that the Subaru 2. Nov 6, 2023 · Subaru 2. parked the car that night and had spark plugs replaced. May 9, 2020 · So I'm pulling my 2014 STi out of storage on Monday and I'll be performing the cylinder #4 cooling mod in a few weeks. Nothing too flashy here. Mar 17, 2019 · This week we will be speaking about @getadomtune cylinder 4 cooling mod. 5L Turbo) Apr 3, 2012 · 2005 STI, 113000kms - 70625 Miles Mods: Invidia N1 Catback Exhaust Bought my STI in september and it is starting to throw cylinder 4 misfire codes, you can feel it in the idle only sometimes checked to see if there was foam around the oil cap and there is none, changed my plugs, haven't tried moving the coil packs yet but that is next. Jun 5, 2009 · I've since replaced the knock sensor but when I went to clear the code there was a second code; P0304- Misfire Cylinder 4. com! Jul 13, 2022 · Hey guys, Got a fresh motor last July and have had a conditional cylinder 4 misfire ever since getting the car back. 7K views 9 replies 7 participants last post by Neil Brown Aug 19, 2021 Supacool1 Discussion starter Jun 14, 2020 · Repair Information for P0304 Subaru code. Industry-first (and patent-pending) DOHC EJ Cylinder 4 Combustion Chamber Cooling kit increases coolant flow in the LH head to improve reliability by reducing detonation causing hot spots, reducing EGT delta, and improving overall cooling system performance. Code came back about 5 miles later as cyl 4 misfire (P0304). I replaced the plugs, swapped Mar 18, 2022 · The reason cyl 4 is the weak link is because with UEL headers, cyl 4 gets the brunt of the 'unequal' pressures, which causes heat buildup. Its less of an issue with the equal length headers, and not an issue on the FA20DIT in the 2015+ wrx Cylinder 4 looks super easy to do, how about AOS if I have a full set of tools/garage at my disposal. 5-liter turbocharged powerplant is the largest displacement engine ever installed in a WRX STi model and is exclusive to the North American market. The nature of the water passageways around this area means a lack of cooling can lead to an increase in the temperatures around this cylinder. I went ahead and changed the coil packs and spark plugs and the code went away. 49 at Subimods. From that point of view, it seems Oct 2, 2008 · Hi all, Just after an opinion on my (dry) compression test results for my 2008 STI. I have a friendly local service writer/dealer and took it in there to get it checked out. Type: Coolant Mod Kit. I thought maybe it would go away on my way home but no such luck I made it to the dealer on my way home and the code came back cylinder 4 misfire. Check out the deal on Roger Clark Motorsport Cylinder 4 Cooling Mod Kit (Gloss Black), '02-'14 WRX & '04-'21 STi at OAKOS Automotive Apr 5, 2019 · This mod claims to reduce the cylinder 4 "hot spot" which would mean that the coolant is absorbing more heat from cylinder 4. com Subaru forum. This was released during last summer and I decided to give it a go on the STI. Jul 2, 2017 · Driving last night after a long trip as soon as I come of the highways I get the cylinder 4 misfire code does anyone have any suggestions as what it could be. Each hose kit features a custom formed NBR hose and custom machined 6061 anodized fitting. It has only 28,500 miles on it and never had a problem. Obviously, there is something wrong Feb 18, 2017 · Hey guys, I am out of ideas on whats up with my STI. 7K views 9 replies 7 participants last post by Neil Brown Aug 19, 2021 Supacool1 Discussion starter Sep 11, 2015 · 13 wrx misfire issuestrange fix Warranty Issues & SOA Problems Jun 14, 2020 · Repair Information for P0304 Subaru code. Car seems fine if I don't get on it to hard. Namely: When draining the coolant, is it best to just pull the lower hose on the radiator? Or Jan 31, 2021 · I dont think the cylinder 4 cooling mod is all that great. In the last 7 months I have replaced around 7 spark plugs and a coil pack and I only drive her on the weekends. It would be highly unlikely that 4 coils or 4 injectors went bad all at the same time. Yes, that is the logic there. 5L Turbo) Oct 20, 2011 · Hey guys, on my way to work last night, about 20 min. It is exhibiting rough idle, lack of power, strong smell of gas from exhaust. GetaDomTune Cylinder 4 Chamber Cooling System Stainless with 5/8 T - 2002-2014 Subaru WRX / 2004-2021 STI Cylinder 4 cooling mod is for the ej257 and ej255 especially with unequal length headers. Navigation System. Tech told me I also had 2 vacuum leaks Nov 29, 2012 · 06 STI Cylinder #4 Misfire Factory 2. Before you can even diagnose P0304 in your car, you need to find the fourth cylinder’s location. Get a better feel of the track by reducing power steering assistance at speed while maintaining assistance for slow speed turning and parking. Industry first DOHC EJ Cylinder 4 Combustion Chamber Cooling kit increases coolant flow in the LH head to improve reliability by reducing detonation causing hot spots, reducing EGT delta and improving overall cooling system performance. The Subaru WRX STI's engine is a turbocharged petrol, 2. 2004 - 2020 Subaru STI. RCM's cost effective solution to this problem lies in our easy to fit Street Spec Cooling kit. I have a persistant misfire at idle, below 1200rpms only. Keep your EJ happy by installing our kit. Get to know the inner workings of your Subaru STI engine. Apr 29, 2016 · So I started getting a P0304 code this past Sunday (4/24). Aug 26, 2025 · All EJ20 / EJ25 engines. What do you guys think? I haven't gotten the Apr 19, 2025 · When you think about Subaru performance, one engine platform immediately comes to mind—the EJ257. I wish I installed it much sooner, might've saved me an engine rebuild! Basically it If your Subaru car is misfiring, it’s not a good situation. Aug 17, 2021 · 2004 - Cylinder 4 Coolant mod (link) - any benefits on a relatively light tune? Jump to Latest 7. Nov 2, 2025 · This helps reduce knock and detonation in cylinder #4, which is known to cause the dreaded EJ ringland failure Fit for： All EJ20 / EJ25 engines 2002 - 2014 Subaru WRX 2004 - 2020 Subaru STI 2004 - 2008 Subaru Forester XT 2005 - 2009 Subaru Legacy GT Package Inlucidng： 1× Cylinder 4 Coolant Mod 1× T Fitting 2× Clamps Just as picture shown . So I installed the getadomme cylinder for cooling mod this past week. Backup Camera Push Button Start. This mod helps to cool down cylinder 4 so the valves doesnt get burn and bend. According to them the normal Jul 13, 2005 · Figured I would update for funnies. I noticed throughout the week that it would come in sooner and sooner each time. Does anyone knows if it could void the warranty? Sep 21, 2024 · Buy Cylinder 4 Coolant Mod Cooling Hose Kit Replacement for Subaru WRX/STI/LGT/FXT EJ 20 25 Engines 2002-2020: Accessories - Amazon. Leaving cylinder 4 to see the highest coolant temps, least amount of fuel and most aggressive tuning. I guess where would you start, compression test first? Or do spark plugs and coils. This is how I diagnosed the problem in less than 10 minutes. even Reduce knock and detonation Prevent ring land failure 6061 billet aluminum Precision CNC machined Multi-layer silicone hose Stainless steel clamps Designed t Aug 23, 2018 · DOHC EJ Cylinder 4 Combustion Chamber Cooling kit Factory 2. So it brings the temps of cylinder 4 down a couple of degrees, ok and. Oct 23, 2011 · 2011 STI Cylinder 4 misfire Newbies & FAQsWelcome to the NASIOC. The GetADomTune Cylinder 4 Coolant Mod is an essential modification to the EJ 25 engine. Yesterday i did an oil change and afterwards she was idling weird, sounded and felt like it was missing. Nov 8, 2025 · Description： 100% Brand New Color: BLACK Cylinder 4 Coolant Mod for Subaru EJ Engines was designed to increase coolant flow to cylinder #4 head area. May 13, 2025 · All EJ20 / EJ25 engines. The additional coolant flow helps reduce cylinder #4 coolant temps and keeps the temps more uniform with the rest of the cylinders. 1 kgm) at 4000 rpm. This will help reduce the cylinder number 4 coolant temperatures to keep them more uniform with the rest of the cylinders to reduce knock and detonation. 5L Turbo) Jun 10, 2010 · Im down right pissed off at this point. Reset the ECU by unplugging the battery, still came back after Nov 23, 2021 · Currently have a 2021 STI with the following mods: Cobb SF Intake w/ airbox Cobb EBCS Cobb LF BPV Cobb Catted Downpipe Cobb AP w/ Pro-Tune Invidia R400 exhaust (catted) IAG AOS Does anyone recommend upgrading the fuel system with the above listed setup? I saw a Cobb Fuel System upgrade kit for Oct 6, 2009 · 2004 STI misfire in cylinder 4. This additional coolant flow helps reduce cylinder #4 coolant temps and keeps the temps more uniform compared to the rest of the cylinders. I have notice it will bog at idle, don't know if sti's do this. 2002 - 2014 Subaru WRX. I followed several online Subaru designed the cooling system to ensure that cylinder #4 ran slightly hotter than the rest of the cylinders, this allowed them to then tune the system so that if knock were to occur is would happen first on cylinder #4. srcif lqcqso six uvclzn qxpax yeir cjoir frhbzbo wnvx jwbt hfwfv yzt owhr yxns pkhown