Subaru cylinder 4 misfire, I have a question. 2014 Subaru Forester Cylinder 1 misfire (worn piston rings) Timing chain cover oil leak Driver rear tpms is broken A/C has a refrigerant leak No other problems with the car . 1 and 2 fire at the same time and 3 and 4 fire at the same time. What should I do other than swapping a whole new engine. . OUTLINE OF DIAGNOSIS Detect the presence of misfire occurrence. Interestingly, it didn't throw any codes. Sep 7, 2024 · The P0304 code means that the cylinder 4 is misfiring or is randomly misfiring. Turned out the #4 spark plug boot was torn, and the valve cover gaskets were leaking a bit. New wires/plugs, spark plug grommets and VC gaskets, and now it runs beautifully! Brian Edited June 5, 2009 by Bmm001 spelling Dec 2, 2018 · If your Subaru WRX has P0300 and P0304 error codes, it’s best to diagnose why the fourth cylinder is misfiring and see if that will fix the P0304 code. 5 times of FTP) and catalyst damage is made obligatory by the law. I have searched the forum for all code P0304 threads and followed the suggestions. I just did a leak down test and here are my results: 1: 168 3: 164 5: 174 2: 162 4: 163 6: 142 Pretty interesting that the cylinder that had a misfire had the most compression. Oct 9, 2024 · This engine has a dual spark ignition and the plugs fire twice per cycle. I found that the ignition coil was bad on cylinder 3 so I replaced it. Try doing the swap test from the previous section. Jul 13, 2025 · The coil on this generation fires 2 cylinders at the same time, so 2 cylinders can misfire at the start of the problem. Any advice on that? The cylinder one I replaced the fuel injector because the coil was fine. Misfire affecting these two has three patterns below. May 10, 2015 · Hi all, I’m getting a random misfire on cylinder 4 code on the MY06 Facelift 2. I have a 2012 Subaru outback that has 2 misfire codes for cylinder one and three. Cars has a clean title DTC P0304 CYLINDER 4 MISFIRE DETECTED1. 5XT . 21 hours ago · The car has a misfire in the #4 cylinder but still drives. Single cinder misfire could be the plug, wire, injector, and even recently reported the injector driver in the ECM. After I replaced it I got a p0353 ignition coil code. My 06' legacy gt had bad compression on the driver side cylinders ( video is cylinder 4) and the mechanics told me that the engine is basically cooked because we replaced the coils, spark plugs and the fuel injectors and nothing fixed it. This causes a chain reaction because unburned fuel exits the cylinder and the AF sensor sends the feedback to the ECM that the exhaust is rich and it leans out the fuel affecting all 4 cylinders and can create the atmosphere I swapped cylinder 5 and 3’s plug wires and 5 still had misfire and 3 still ran fine so I mostly ruled out the wiring. Sometimes I get it on cold start up, sometimes she runs as smooth as Oct 28, 2010 · Updating the ROM in the ECU to the latest revision from Subaru helps alleviate most false misfire issues. Aug 25, 2014 · While driving home the check engine light came up with code P0304 Cylinder #4 misfiring Detected. Start by checking for intake leaks and if no leaks are found the next step is to replace the spark plugs on cylinder 4. Jun 5, 2009 · A few weeks ago, my '03 outback started missing/stumbling when it was cold. This can be done through the stealership or opensource software. (Revolution fluctuation method) Monitoring Misfire which influences exhaust deterioration (1.
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