Subaru WRX Forum banner
1 - 1 of 1 Posts

1 Posts
Discussion Starter · #1 ·
2005 Subaru Wrx - 162k miles
Cobb stage 2 on 91oct

Over the past few months I've been seeing more and more knock reported on my Cobb AP. Recently the DAM dropped to 12 (from 16) which I saw as a cause for concern. For fine knock learn (FKL) and feedback knock (FK), ive been seeing values as low as -9 and a lot of consistent numbers around -4.

I consulted with Cobb and had two shops look at it, but they all agree the engine seems to be running fine. I followed their recommendations but its seems to keep getting worse. I had the timing belt replaced, new iridium spark plug, boost leak test, new boost hoses and clamps, and a compression test which came back around 160 for all cylinders.

After the replacements, the DAM rose to 15 but now im seeing timing added to FKL at a consistent 0.35. I've switched to Shell 91oct two days ago but haven't noticed any change. I can't for the life of me figure out what is going wrong.

SOS - save our subie!
1 - 1 of 1 Posts