05.5abpLGT Posted December 14, 2013 Share Posted December 14, 2013 Sooo, 2005 5eat with a Bnr 16g, tuned to 19.5psi. Car has had a slight loss of power here lately but in the last 24hrs its gotten to the point it will barely move under 4k rpm . Acted like plugs were fouled so,it has new now and still no power . Possible cnt catted downpipe clogged?? Strange part is the ecu is pulling timing as soon as it.begins to build boost, i've seen as much as -10 degrees at 10psi?? Any ideas?? Link to comment Share on other sites More sharing options...
ibr_adam09 Posted December 14, 2013 Share Posted December 14, 2013 I'd stop boosting. Can you get us logs ? Any noises ? can you still build full boost ? cel codes ? Link to comment Share on other sites More sharing options...
05.5abpLGT Posted December 14, 2013 Author Share Posted December 14, 2013 No noises other than power steering pump which i've bypassed to make sure it wasn't "the" problem. No cel codes, I'll load the log as soon as i can. I'm leaning towards cam sensor due to the ecu retarding timing. . . . It also wouldn't suprise me to be transmission related due to the power level on the completely stock trans. . . Fyi Link to comment Share on other sites More sharing options...
05.5abpLGT Posted December 14, 2013 Author Share Posted December 14, 2013 Not hitting target boost either, barely building 10psi before it begins to bog and the rpms fall Link to comment Share on other sites More sharing options...
ibr_adam09 Posted December 14, 2013 Share Posted December 14, 2013 Id assume the car is in limp mode. disables boost and runs only waste gate pressure. Sounds like knock may be occurring, did you log that ? look into any air leaks, maf sensor, and fuel system like injectors, pump, fpr. Might be running lean. I'd also run a leak down test. Link to comment Share on other sites More sharing options...
JmP6889928 Posted December 14, 2013 Share Posted December 14, 2013 Limp mode would be my guess as well. I would look at front O2 and possibility of cat either being clogged itself or coming apart clogging exhaust. Had a Mazda MX-6 do that with the front cat came apart and clogged up the rear cat and it would idle fine and go slowly fine, and then had no guts at all. Eventually, all it would do is idle and would barely go at all. Check your exhaust flow out the rear of the car and see how it feels. If you can find someone else with a car basically the same as yours, check and see how their exhaust flow compares. Link to comment Share on other sites More sharing options...
I Donated thefultonhow Posted December 15, 2013 I Donated Share Posted December 15, 2013 Very low power, low boost, possible knock? Sounds like a compression test might be in order. Link to comment Share on other sites More sharing options...
05.5abpLGT Posted December 20, 2013 Author Share Posted December 20, 2013 So here's a log from the recent test drive after checking mechanical timing which was correct, and cleaning the MAF. Problem is definatly still there. I'm seeing some posts about the passenger cam sensor? I find the small irrregularity between the driver and passenger AVCS timing to be strange as well.datalog36.csv Link to comment Share on other sites More sharing options...
I Donated thefultonhow Posted December 20, 2013 I Donated Share Posted December 20, 2013 You are logging too much, and you're logging the wrong things. Log RPM, boost (a.k.a. manifold relative pressure), load, IAM/DAM, knock sum (these last two replace feedback knock correction and all four roughness counts), and throttle position for sure. Others may want timing, injector duty cycle, MAF (g/s), and WGDC. A third gear pull would help too. I do notice your WGDC is 0 throughout the log, which probably means IAM is 0 too. Two possible reasons, judging by the weird Cyl 4 Roughness numbers: 1. Bad injector in that cylinder. Swap injectors between 2 and 4 and see if the problem follows the injector. You may need to log the cylinder roughness counts to determine this. 2. Low compression in that cylinder. Do a compression test. Link to comment Share on other sites More sharing options...
JmP6889928 Posted December 20, 2013 Share Posted December 20, 2013 If Subaru would just make these damn things a 3 cylinder, there would be no more cylinder 4 failure.... Link to comment Share on other sites More sharing options...
05.5abpLGT Posted December 20, 2013 Author Share Posted December 20, 2013 Yes i noticed the roughness, its odd its only at idle and goes away as soon as i take off. I would also think low compression wouldnt be an intermittent problem as my problem comes goes, occasionally it runs flawlessly, unfortunately the problem shows itself 90% of the time. It does slowly get worse the longer it runs which leads me to think electrical (cam sensor, avcs related??) Link to comment Share on other sites More sharing options...
I Donated thefultonhow Posted December 20, 2013 I Donated Share Posted December 20, 2013 Yes i noticed the roughness, its odd its only at idle and goes away as soon as i take off. I would also think low compression wouldnt be an intermittent problem as my problem comes goes, occasionally it runs flawlessly, unfortunately the problem shows itself 90% of the time. It does slowly get worse the longer it runs which leads me to think electrical (cam sensor, avcs related??) When I cracked a ringland and lost half the compression in Cyl 2, I got considerable knock at idle, but less when under load. But, your problem seems to be that the roughness is high until the knock correction shoots up, then the roughness goes down. Basically, the ECU retards timing so much that knock goes away. As for the intermittent thing... my car ran fine with the broken ringland at full throttle. It was crap at part-throttle, though. Also, I wasn't at wastegate boost. Link to comment Share on other sites More sharing options...
05.5abpLGT Posted December 20, 2013 Author Share Posted December 20, 2013 Mine seems similar, although, it runs good at partial throttle and is garbage at more than 50% throttle. Ill try and do a compression/leak down soon. Link to comment Share on other sites More sharing options...
05.5abpLGT Posted December 20, 2013 Author Share Posted December 20, 2013 Latest symptom, small amount of oil pooling around passenger cam sensor, just enough to smell through the interior vents. Link to comment Share on other sites More sharing options...
Pazuzu Posted December 20, 2013 Share Posted December 20, 2013 just throwing it out there. did you check your fuel pressure? what did your plugs look like? Link to comment Share on other sites More sharing options...
05.5abpLGT Posted December 20, 2013 Author Share Posted December 20, 2013 Solved: So the problem at hand was indeed solved by a new passenger side cam sensor, $25 at local parts store. Ecu seems to be relearning itself but all hesitation is gone, thanks for the input fellas and ill still be looking into the cyl 4 roughness........ Link to comment Share on other sites More sharing options...
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