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Exhaust chirp

Biasatti98

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Biasatti98 Enthusiast

Biasatti98

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Posted

I have a 2000 gmc sierra 1500 5.3 with true duals no cats I recently put full soze glass packs on it then I started it this morning and there is a chirp coming from the driverside pipe. I check for leaks couldn't really find anything then i was wondering if a valve or something is bad so i put a piece of paper over the exhaust and there is a flutter out of both pipes so i got scared thinking a valve is burnt or stuck but i am not down on power it starts right up and fuel millage is normal so i dont know if i just got a bad glasspack and its chirping through something but any help is appreciated thanks.

  • 2 weeks later...
Supreme Pizza Senior Enthusiast

Supreme Pizza

Posted
Posted

I would visit an exhaust repair shop. Don't pay anything, this should all be free. Ask them to listen to it (Or a recording of it). They will put it up on the rack, and check all the normal culprits. If they can find a problem, ask them for a free estimate on repairs. Take the vehicle to another shop, and ask them if the repair estimate you were given is correctly diagnosing the problem, and what they would charge to fix the same problem. If you pay for an exhaust repair to fix the problem, don't do it unless they guarantee it will solve the problem or refund your money. Any shop that is doing things properly, will agree to these terms. They won't waste your money that way.

 

It could be unburnt fuel entering the exhaust, due to the cold start engine management adjustments (richer fuel trim) Normally a stock exhaust system would hide these sounds. If you went to strait headers, I bet you would hear some more engine noises that you are not accustomed to as well. Modifying the exhaust can effect engine performance, noise, fuel economy, power output, etc.

 

The stock setup is the best all around exhaust system for general use. Its also good, because the first set is free (already on the vehicle). Racing demands better flowing exhaust, either by increased pipe size, or removal of restrictive components. Most people buy exhaust for a "better" or "louder" exhaust sound.

 

If you have a burnt or stuck valve. Symptoms would be:

 

Low or No compression in a particular cylinder

Compression does not increase after oil is added to combustion chamber

Engine shaking more than normal.

Check engine light on,

OBD2 code referring to: cylinder misfire, especially a particular cylinder

OBD2 O2 sensor codes

Decreased fuel economy

Smell of fuel in the exhaust

Backfiring

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