Backfiring on decelaration - Team Camaro Tech
Troubleshooting Diagnosing problems done here.

 
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post #1 of 5 (permalink) Old Dec 10th, 02, 04:00 PM Thread Starter
 
Join Date: Sep 2002
Location: Glendora,CA U.S.A.
Posts: 9
Help. I hava a 68 camaro with a 72 350 ci and a quadrajet. I just put a hei distributor in to relieve backfire thru exhaust but to no avail. I have the stock exhaust manifolds and have a moderate exhaust leak in exhaust pipe about 12" past exhaust manifold. Timing is @ 6 btdc. ANy ideas? Thanks, Jim.
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post #2 of 5 (permalink) Old Dec 10th, 02, 05:35 PM
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Join Date: Feb 2002
Location: Williamstown,PA
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Your problem is the exhaust leak near the manifold. I had a donut gasket on the manifold on my truck leaking and it blew the muffler in half. The leak lets air into the exhaust pipe and the slightest spark from the exhaust port on deceleration turns your pipe into a cannon.

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'69 RS Camaro
355 5-speed 4.11
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post #3 of 5 (permalink) Old Dec 11th, 02, 05:52 AM
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Join Date: Sep 2000
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Carb running alittle rich?

Turn down idle mixture screws 1/4 to 1/2 turn, lean the mixture out.

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Everett "OBJECTS IN THE MIRROR APPEAR QUICKLY UPON RAPID DECELERATION"
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post #4 of 5 (permalink) Old Dec 11th, 02, 04:05 PM Thread Starter
 
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I thought it might be the exhaust leak, thanks alot for confirming,I'll lean out the carb too.
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post #5 of 5 (permalink) Old Dec 11th, 02, 08:56 PM
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Have a vacume gauge to read the manifold preasue reading. Tune mixture or mixtures for max vacume effect at idle.
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