Engine backfires when decelerating

SGT in Ont.

SGT in Ont.

Senior Member
My engine has started to backfire when I decelerate coming to a stop sign. I've tried re-setting the points, runs fine when cool, but starts to act up when the engine gets hot. Any suggestions?
 
have you cleaned the jets in the carb, checked the float level, checked the bowl for sludge, rust and junk...more than likely on of the culprits.
 
Usually means it's running lean. Vacuum leak or carb jet problems. Where do you run your GAV?
 
Could easily be caused by a leak in the manifold or exhaust clamp altering the gas to air mixture, or as said, just running too lean.
 
I agree with an exhaust leak . If driving with the the spark partly retarded, this will also contribute to deceleration backfire.
 
Is it backfiring out the carb or the exhaust? They are 2 completely different problems. If you backfire out the exhaust it is most likely a leak, especially if it is once the engine is hot. The muffler and manifold flex once hot and any imperfection in the sealing of either of them will become worse.
 
700rpm said:
Usually means it's running lean. Vacuum leak or carb jet problems. Where do you run your GAV?
Click to expand...
Driving around town the GAV is about 1/2 turn open down to about 1/4. If I go out on the secondary roads where the speed limit is 50mph I have to open the GAV to about a full turn open so that it has the power to keep up with traffic.
 
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