Inconsistant Knock

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Sep 17, 2001 | 12:12 PM

z28dan

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Joined: Jul 1999

Posts: 111

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From: Chicago

Inconsistant Knock

After looking over my datalogs, I noticed a inconsistent knock appearing. It's not at any specific RPM or load. I am not sure how to tune for something like this, I normally look for patterns. One thing in can think of is that my exhaust is hitting something possible the floor board under hard acceleration. Could the knock sensor mistake this noise as knock? I do not believe that my knock sensor is over sensitive, it's never been changed out.

Any ideas?

------------------
1988 L98
Vette Heads/no EGR
SLP Headers/Y-Pipe
ARAP bin

Sep 17, 2001 | 12:36 PM

Grumpy

Supreme Member

Joined: Jun 2000

Posts: 7,554

Likes: 1

From: In reality

Car: An Ol Buick

Engine: Vsick

Transmission: Janis Tranny Yank Converter

Quote:

<font face="Verdana, Arial" size="2">Originally posted by z28dan:
After looking over my datalogs, I noticed a inconsistent knock appearing. It's not at any specific RPM or load. I am not sure how to tune for something like this, I normally look for patterns. One thing in can think of is that my exhaust is hitting something possible the floor board under hard acceleration. Could the knock sensor mistake this noise as knock? I do not believe that my knock sensor is over sensitive, it's never been changed out.
Any ideas?
</font>

The GM *knock detector* is an acoustic devise, it just listens for a particular noise, it doesn't care what the source is.
Exhaust rattles, Altern Bearings, serpentin belts can all trigger one.