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severe engine knock?
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Old 25 Jul 2013, 10:19 PM   #1 (permalink)
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severe engine knock?

Hi guys I have a 2009 impreza 2.5i auto with only 40k miles on it. I do all the service and maintainance regularly including Spark plugs (ngk laser platinum). Anyway according to my logs engine knocks bad between 2000-3000rpm. So much so that IAM drops to zero and engine pulls as much timing as possible which often leads to poor low end power (more like non existent power). BUT I personally don't hear anything but my car does have a noisy heatshield/exhaust at low RPMs in hot weather. Am I a victim of false knock? I use premium gas only and car is stock.
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Old 26 Jul 2013, 01:47 PM   #2 (permalink)
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Re: severe engine knock?

shouldnt be doing it so may point to a duff sensor, im guessing your US?
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Old 26 Jul 2013, 11:38 PM   #3 (permalink)
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Re: severe engine knock?

I'm in canada, toronto to be exact. Altitude is about 300 ft. Gas i use is ethanol free 91. Same gas I use in my turbo Acura RDX running 15-16 psi boost with no issues. Intake tempratures are about 70-80f.

here are couple logs i saved:
https://docs.google.com/file/d/0B3d0...NZZmRhZGc/edit
https://docs.google.com/file/d/0B3d0...drcnREWWc/edit
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Old 29 Jul 2013, 09:32 AM   #4 (permalink)
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Re: severe engine knock?

strange that the first logging has a few sensor readings missing!, your AIM seems rather low too on the 2nd set ,which says to me its seeing knock all the time tbh,
there is no Grams/s for the Maff either,
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