Join Date: Nov 2001
Location: North Central Illinois
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Re: Backfire Problem Help Needed
Check to see if you have an exhaust leak , especially at the collector on your Thorley . The fuel left over when you let off the throttle gets a whiff of oxygen through any exhaust leak ahead of the muffler , that O2 will cause the hot gasses to ignite . Sometimes pretty violently . I remember the early to mid 70's Chevy Nova's that had that wonderful smog pump . If the bypass valve got bad , it would throw all this cool fresh air into the exhaust during deceleration , and blow the muffler clean off the car . Some of them did it with huge flames under the rear of the car . Pretty cool , in a way.....