kr and pinging - Page 3 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 06-07-2005, 01:16 AM   #21
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checked the plugs and re gapped them. The plugs looked nice and clean light gold / brown. didnt have time to swap back to stock pulley
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Old 06-07-2005, 02:40 PM   #22
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Yeah for the TPS mod you are fine if your idle is BELOW .75v. I did the mod and I think my idle is .60 so you should be fine there.
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Old 06-07-2005, 09:30 PM   #23
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It'* strange that it doesn't pick up knock when you can hear it but does once you let off the gas. It'* especially strange because assuming your timing is not insanely advanced (which it looks normal) with a wicked lean condition (which also looks normal), detonation only comes under load. Even then you're more likely to see detonations
evil(er) brother, pre-ignition.

A knock sensor listens for a specific tone. If it'* given that everything is in excellent shape from the PCM to the knock sensor (and the knock sensor isn't too tight or loose), I suspect you may have something rattling at just the right frequency to set it off. It'* possible that while under load you can hear it better but free revving creates that certain tone. Some SII guys use a sound barrier on their transmission and around the knock sensor for just that kind of issue.

Maybe try revving it in neutral (don't go too far!) and see if you get a few degrees of KR that way. Another way would be to take it up to speed and manually downshift it. You could take that a step further and tap the gas a few times while slowing down just to jolt the car. If you get KR with either of those you should spend some time checking that everything is bolted down tight and nothing is banging against the block/trans. If you don't get any knock then definitely try the stock pulley and see if that hushes it up.

Just a thought..
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Old 06-07-2005, 10:51 PM   #24
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To my knowledge the knock sensor sends the signal to the prom and the prom relays that info to the computer and then the computer is what tells the engine to change the advance / retard. correct me if I am wrong.
I still think that the prom is screwed.
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Old 06-08-2005, 06:54 PM   #25
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anyone ???
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Old 06-08-2005, 07:27 PM   #26
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Yes, the knock sensor does that.

No, I don't think there is a problem with your prom. My guess is probably something else.
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Old 06-09-2005, 12:15 AM   #27
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Quote:
Originally Posted by d.denis
To my knowledge the knock sensor sends the signal to the prom and the prom relays that info to the computer and then the computer is what tells the engine to change the advance / retard. correct me if I am wrong.
I still think that the prom is screwed.
what I am saying is, if the prom is what relays the info to the computer then maybe the prom is screwed. causing a delay between the knock sensor hearing the knock and the computer retarding the timing.
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Old 06-10-2005, 12:55 PM   #28
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