Jdubgt530 Posted January 10, 2016 Share Posted January 10, 2016 I'm calling this the final misfire thread because it's the last one I'll post. I'm about to bring my car down to my buddies uncles shop to replace the clutch and figure out what is causing my misfire. Just want opinions on what it could possibly be. Here's what I have replaced so far; (ej25d) Spark plugs (ngk iridiums 0.44 gapped) Spark plug wires Coil pack Igniter Fuel injectors Fuel pump (went out one day) Cam position sensor Crankshaft position sensor Gates timing belt kit Crankshaft timing pulley Remuanfactered heads Head gaskets Ecm This problem has persisted since I've owned it and have had misfire codes popped since I've owned the car. The misfire codes change constantly. One that pops up the most is p0304. I've narrowed it down to either wiring, timing, or the cats. Everything I have done has been done correctly and I've even brought it to a Subaru shop here in my town and they can't find the problem. Just getting last minute opinions before I work on it what people might think it could be Link to comment Share on other sites More sharing options...
Tr00b Posted January 10, 2016 Share Posted January 10, 2016 How was your crank pulley shear key? If the bolt isn't torqued the pulley will walk back and forth or the shear key is slightly sheared. Check fuel pressure. Regulator issue perhaps. Link to comment Share on other sites More sharing options...
Jdubgt530 Posted January 10, 2016 Author Share Posted January 10, 2016 The sheer key is in great shape and the drive belt pulley was torqued down correctly. I'm pretty positive that the shop I took it to said that the fuel pressure was solid. I haven't checked the regulator yet though. Link to comment Share on other sites More sharing options...
Guest Posted January 10, 2016 Share Posted January 10, 2016 Did you gap the iridium yourself? Link to comment Share on other sites More sharing options...
Jdubgt530 Posted January 10, 2016 Author Share Posted January 10, 2016 Came gapped at 0.44 I only checked the to ensure that it was correctly gapped Link to comment Share on other sites More sharing options...
Guest Posted January 11, 2016 Share Posted January 11, 2016 Ok, I was about to say that you don't Gap iridiums, you'll break the point Link to comment Share on other sites More sharing options...
Jdubgt530 Posted January 11, 2016 Author Share Posted January 11, 2016 Oh I know that lol. I only checked them for correct gap. Definitely at a loss for what this could be other then what I stated above Link to comment Share on other sites More sharing options...
Jdubgt530 Posted January 12, 2016 Author Share Posted January 12, 2016 This is what it says for a misfire. Which is why i have done everything I have done. Compression comes back good (i didn't do the test personally but the shop said that my compression is perfect), ignition components came back good, and fuel pressure is good. I am beginning to think it might be the 02 sensors. They were not fully checked when I had them check it. I have a brand new one for the upstream. Link to comment Share on other sites More sharing options...
FLlegacy Posted January 12, 2016 Share Posted January 12, 2016 Are you using the oem oxygen sensors, I have heard of aftermarket ones causing false cels. Sent from my SAMSUNG-SGH-I337 using Tapatalk Link to comment Share on other sites More sharing options...
Jdubgt530 Posted January 12, 2016 Author Share Posted January 12, 2016 I'm not sure what is on it right now but I have a Bosch one to replace it with. I heard from my buddy who lives a town over from me that the Bosch o2 sensor works great Link to comment Share on other sites More sharing options...
Osei Posted January 15, 2016 Share Posted January 15, 2016 Suggestions anyone? O. Link to comment Share on other sites More sharing options...
Tr00b Posted January 16, 2016 Share Posted January 16, 2016 I've heard lightened flywheels or loose flywheels can cause misfire cels. Link to comment Share on other sites More sharing options...
Jdubgt530 Posted January 17, 2016 Author Share Posted January 17, 2016 Tr00b you make a good point there. My fiancés uncle asked if my car is chattery (meaning rough starting out from first from a stop) and he said my flywheel might be toast or needs to be surfaced. So it works out that I'm doing a full clutch kit on my car. Hopefully that will solve the mystery Link to comment Share on other sites More sharing options...
Tr00b Posted January 18, 2016 Share Posted January 18, 2016 For that matter a bad harmonic balancer could cause the Same effect as a bad flywheel. Check out the rubber on it, if it's cracked a bunch or squeezing out you might do good to try a different one Link to comment Share on other sites More sharing options...
twisty Posted January 19, 2016 Share Posted January 19, 2016 one thing that isnt on that list that caused my ghost misfire is the timing sprocket. i changed everything chasing my code down as well, but didnt solve it until i noticed the timing sprocket had the nubs chewed down by the sensor being too long, causing the misfire that wasnt actually misfiring. when i changed that out, no more code. Link to comment Share on other sites More sharing options...
Jdubgt530 Posted January 19, 2016 Author Share Posted January 19, 2016 The harmonic balancer is in great shape, I checked that awhile ago. Twisty, I did change my cam position and crank position sensors. Which sprocket are you talking about? On the cams? Link to comment Share on other sites More sharing options...
twisty Posted January 26, 2016 Share Posted January 26, 2016 the timing sprocket on the main, for the timing belt. its the one the top sensor reads, looks like this: http://subaruvanagon.com/tom/Timing%20Belt/Crank%20at%20TDC%20and%20timing%20mark%20sm.jpg Link to comment Share on other sites More sharing options...
johnegg Posted January 26, 2016 Share Posted January 26, 2016 for the record, this pick is NOT the correct position for installing the timing belt. i do not think anyone suggested it was, but i do not want anyone making a mistake because it was not specified. http://subaruvanagon.com/tom/Timing%20Belt/Crank%20at%20TDC%20and%20timing%20mark%20sm.jpg Link to comment Share on other sites More sharing options...
twisty Posted January 26, 2016 Share Posted January 26, 2016 ya, i noticed that when i went back in. its from a thread here in legacyGT forums too, hehe. Link to comment Share on other sites More sharing options...
Jdubgt530 Posted January 26, 2016 Author Share Posted January 26, 2016 Yeah I've replaced that crankshaft sprocket, I did it when I replaced the heads and timing components. I also replaced the crankshaft position sensor also. No dice on that route. Does anyone else think a flywheel could be causing this? Link to comment Share on other sites More sharing options...
Jdubgt530 Posted January 29, 2016 Author Share Posted January 29, 2016 Anyone? Link to comment Share on other sites More sharing options...
Tr00b Posted January 30, 2016 Share Posted January 30, 2016 Have you looked at the flywheel yet? Link to comment Share on other sites More sharing options...
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