imprezkid Posted December 25, 2018 Share Posted December 25, 2018 08 OBXT; EBCS, inlet, Catless DP & CB, composite TGV deletes, dw300, vf52, perrin AOS. Car was having loads of knock (-11) while cruising and some random misfires. Figured it was a fueling issues; replaced w/ ID1000's. Switched a coil pack & my MAF out. Misfire's are gone, knocking persist & id say worse than ever. Was Opensource before; went V3 when got the ID's, tuner is on round 2 of getting me a good base before dyno & e85. 5eat Considering the problem is still alive & thriving i am coming here for help (I've sent my tuner the log too) to see if anything can point me in the right direction. I believe this is a hardware issue & want to get it figured out before the dyno day. I pulled this log tonight after cruising home from Grandmas and the knock pulling timing so bad i barely had the power to keep going. I pulled over; reset the ECU; and pulled this for the rest of the way. Let me know what you think & thanks for the help in advance. I tried reading up on understanding logs but i just don't have it figured out yet. Merry Christmas!!!Knock Long 12-24.csv Link to comment Share on other sites More sharing options...
moral hazard Posted December 25, 2018 Share Posted December 25, 2018 You seem to have fluctuating AF correction, did the tuner change the maf scaling after the intake upgrade? I'd try cleaning the maf sensor again or swap it out if you have a spare to test with (borrow a known good one?). Link to comment Share on other sites More sharing options...
imprezkid Posted December 25, 2018 Author Share Posted December 25, 2018 Intake hasn’t been changed, I was planning on putting a CAI and he said this tume should be good with either for now. He noticed the maf issues as well and asked me to clean it. I cleaned it and nothing changed so i swapped it with the one from my sti yhsf works. Before I swapped the maf it would get to the point I had no throttle. While driving now I can feel an almost constant surging. Maf wiring? Link to comment Share on other sites More sharing options...
Yasha Posted December 28, 2018 Share Posted December 28, 2018 Hmmm, I had a **** ton of knock on my car once the turbo inlet boot ripped right where it connects to the turbo. Would cause A/F learning to go hay wire as well. Also, take off the intercooler and do a thorough check for any vaccum leaks. Check all the vaccum hoses. For me it went, fix one vaccum leak, *does pull*, new vaccum leak appears. Every single vaccum hose has been zip tied or replaced at this point. Link to comment Share on other sites More sharing options...
imprezkid Posted December 31, 2018 Author Share Posted December 31, 2018 i don't think im going to be that lucky. Did a compression test & cylinder 4 was down to 130psi; leakdown came back at 12% with air leaking into the crankcase. I don't want to say ringland, but id guess its possible. Plug was of course VERY light (lean). Link to comment Share on other sites More sharing options...
Yasha Posted December 31, 2018 Share Posted December 31, 2018 Damn, that really blows man. I hope this wasn't your daily. Going to be out for a little bit. Link to comment Share on other sites More sharing options...
relative4 Posted December 31, 2018 Share Posted December 31, 2018 i don't think im going to be that lucky. Did a compression test & cylinder 4 was down to 130psi; leakdown came back at 12% with air leaking into the crankcase. I don't want to say ringland, but id guess its possible. Plug was of course VERY light (lean).Eh? 130 is great, and 12% is fine. What are the other cylinders? Link to comment Share on other sites More sharing options...
imprezkid Posted January 2, 2019 Author Share Posted January 2, 2019 Other cylinders are 150 across the board; around 6%. If you watch the AF correction you can almost see it try to correct when it hits cylinder number 4. Any other ideas i should try before planning a rebuild? Like i said the plugged appeared as though it was running very lean; i switched it out with no change Link to comment Share on other sites More sharing options...
relative4 Posted January 2, 2019 Share Posted January 2, 2019 Wow, never seen above 135 on an EJ255. Well, if those numbers are all for sure, I'd pull the valve cover and check the valve clearances, then if the leakdown is for sure into the crankcase... Link to comment Share on other sites More sharing options...
imprezkid Posted January 2, 2019 Author Share Posted January 2, 2019 motor is a 257; was fine in my sti making almost 480 wheel (), put it in the outback and less than 10k later its broke. Here was my leakdown test; all plugs removed, regulating at 80psi; showing 70psi on the inner gauge. Listened in the exhaust, nothing; listened in the intake, nothing. Removed the oil cap (should have done that sooner i know) and there was clear air moving. I have always been suspect of my AOS setup in this car, but being that the other cylinders were different i couldn't come up with a reason why this would be causing any issues with the test. Link to comment Share on other sites More sharing options...
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