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Miss and Knock problem

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Chris Wh1

Member
Joined
Jan 23, 2004
Messages
334
Got a problem that has been going on for a bit and cant seem to figure it out. The car misses at idle pretty rough. After the car warms up and I shut it off, then start it back up, it misses REALLY bad, like its running on 4 cyl. Any ideas??

Second issue on hand. Knock is been a problem since day one. I dont even have to get into 3rd gear and it will show 10+ degrees of KR with a O2 over 800. I turned down the fuel pressure to see if it could maybe rich knock, but all numbers stay the same, no matter where the fuel psi is set. When it shows knock, I let out and it takes about 5-7 seconds for all the knock to go away, as it goes down slowly. I am only running 15 lbs of boost and have been between 35-45 psi line off while trying to tune the car to somewhat run ok untill i get a turbo tweak chip. The car has stock turbo, IC, blue tops, and 3'' THDP. Any ideas would be great as I am about to pull what little hair I have out.
 
Forgot to mention, scanmaster readings after warm, iac is 19, tps is .42-.44,maf is 5, and blm is 128
 
Your running the stock chip then? I would upgrade to the TT chip asap I bet your car clears up. I had similar problems when i purchased my car it ran like crap, after searching on this site and making some posts i got a TT chip and the car was totally different. As far as knock if you still get it after the chip is installed you can adjust for it in the chip and will probably eliminate knock at 15lbs pretty quick.
 
Im running a Lubrent chip, 20* of timing, 93 octane. Its not as agressive chip as I want, but I figured with low timing and boost, I wouldnt have knock problems.
 
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