Stock C5 Knocking???
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Joined: Oct 2005
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From: Warner Robins Georgia
Stock C5 Knocking???
Hi guys,
I have noticed recently that I'm getting what I believe to be a knocking sound from my C5. It seems to occur above 4500 rpm, while at WOT.
At first, I thought it may be the traction control kicking in; however, I turned it off, and the sounds persisted. Next, I thought it may be bad gas, although I only use Chevron, 93 octane... I filled her up again, and the problem was still there.
I am a bit confused though... I would think that the slightest bit of knock would trigger the check engine light; however, mine has yet to come on. Would a knock trigger the CEL?
Are there any scan tools or diagnostic equipment that would monitor in real time the timing to see if the computer is taking timing away at high rpm?
If the CEL does come on if the motor knocks, I guess I can eliminate that as a suspect (unless the knock sensor is dead??)
what else could be causing this type of sound?
Help!
I have noticed recently that I'm getting what I believe to be a knocking sound from my C5. It seems to occur above 4500 rpm, while at WOT.
At first, I thought it may be the traction control kicking in; however, I turned it off, and the sounds persisted. Next, I thought it may be bad gas, although I only use Chevron, 93 octane... I filled her up again, and the problem was still there.
I am a bit confused though... I would think that the slightest bit of knock would trigger the check engine light; however, mine has yet to come on. Would a knock trigger the CEL?
Are there any scan tools or diagnostic equipment that would monitor in real time the timing to see if the computer is taking timing away at high rpm?
If the CEL does come on if the motor knocks, I guess I can eliminate that as a suspect (unless the knock sensor is dead??)
what else could be causing this type of sound?
Help!
Pro
Joined: Oct 2004
Posts: 538
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From: Edmond Ok
Originally Posted by 91_LX
I am a bit confused though... I would think that the slightest bit of knock would trigger the check engine light; however, mine has yet to come on. Would a knock trigger the CEL?
The CEL should not come on with a knock. It should come on if there were a bad knock sensor (ks).
There are tools that can monitor ignition timing, (someone should step in that knows the brand), and it can record how the ks is advancing or retarding the timing.
Race Director
Joined: Nov 2005
Posts: 14,553
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From: Supporting the Corvette Community at Abel Chevrolet in Rio Vista, CA 707-374-6317 Ext.123
St. Jude Donor '08
Have you indtalled an aftermarket air intake recently?? Sometimes an air leak can happen between the boot and MAF or the T/B and bellows. I have seen a couple in our shop for the same problem.
