Posted by fixerupper on November 21, 2009 at 18:50:19 from (207.177.13.178):
It'll blow the muffler wide open if I let up on the gas too fast for the first five miles or so after a cold startup. What a bang! Lights up the countryside if it happens at night. Letting up on it slowly avoids the bang, but what gives? I've been scratching my head about this for several years and several mufflers too. I had a straight pipe on it for awhile to avoid the damage but got a fixit ticket for that stunt. It still did it with the straight pipe. Last night it lit up the countryside for my son but the muffler didn't open up this time.
It's obviously an over rich situation from the choke combined with a cool exhaust system allowing a buildup, but no other vehicle I've ever owned did this.The exhaust is tight with no air leaks around the manifold area, or anywhere, as far as that goes. The timing is right and it's not chugging from being over choked. The converter is not on it anymore. Could that be the reason for this? I have more invested in mufflers than the car is worth! Jim
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