Check for an exhaust leak at the exhaust manifold/downpipe flange (blown
gasket, etc.).
bs
On 9/10/2010 4:17 PM, Leonard Berkowitz wrote:
> Just read an old post concerning backfiring. My BJ7 has been back firing
> badly for about a year. I thought it was due to a small leak in the flex
> pipe, which I have repaired - no change. Someone mentioned lean mixture as a
> possible cause. I have reset my carbs to run about as rich as I can but this
> also has not helped. I do notice when the engine is cold there is less back
> firing. I'm not sure if that is because of the temperature or because the
> choke is pulled out giving me a very rich mixture. However with the engine
> hot and the choke out there is also a marked decrease in back firing. By the
> way the back firing only happens under maximum vacuum conditions, like going
> down hill or decelerating from high speeds with my foot off the gas. Other
> then the back firing I do not seem to have any other problems with the motor.
> Any suggestions!
> _______________________________________________
>
>
--
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Bob Spidell San Jose, CA bspidell@comcast.net
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