Topic: Chirping noise
in Forum: C3 Engines

Moderator
The chirp noise may or may not be associated with the EGR, but...if there has been a leak in the EGR for a while it can lead to the base gasket of the carbatator burning out, and THAT can cause a chirp noise.

Joel Adams
C3VR Lifetime Member #56
My Link
(click for Texas-sized view!) NCRS
"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
Joel, car ran pretty crapy tonight lots of hesitation, when I accelerate it goes but when you just cruise you feel it holding back.
Good friend of mine in our vette club is an older retired mac tool salesman, he's fantastic on Carbs. He asked me when the last time the carb was kitted and I said never. He said I think it is deserving of a kit. I'll pull the carb this weekend and have him rebuild it. Coming down hill to my drive way I down shifted to 2nd and it chirped then also, almost seems like an exhaust leak. When it goes through the gears its in puurrrfect harmony with the RPM's
So how much are EGR valves is it a no brainer to just replace it anyhow?
ebo

Moderator
The chirping could be an exhaust leak, depending on whether or not you have metal gaskets on the manifolds where they bolt to the heads. They can "whistle" at times, and it may get worse when you let off the pedal. IF you have a catalytic converter that is semi-stopped up, the extra backpressure could also cause an exhaust leak to make a whistle/chirp noise....as could a lonely cricket under the seat....

Joel Adams
C3VR Lifetime Member #56
My Link
(click for Texas-sized view!) NCRS
"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
OK put the rebuilt Q-jet back on and went for a spin, still have the hesitation and the chirp. Since I have run some of engine additive maybe cat is plugged would that cause hesitation?
I'm pretty sure all the hoses are good as I was able to check that all real good with the carb off.
And still not sure about the egr valve? Plus I guess even though it does not sound it wonder if I do have a bad spark plug. I know last fall when I did change the plugs one was loaded with the white yellow deposits......
Carb looks great though the guy rebuilding it said he never saw one with the anodize still looking like new, light brushing with laquer thinner cleaned it right up.












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