Re: Stupid Tuning Question

[MGBay@aol.com]

Rob,

Back firing is generally an indication of a lean fuel mixture.  This could be
the fuel mixture of the SU carbs or possibly an intake vacuum leak.  Try
enriching the carbs a little at a time and see if that doesn't get rid of the
backfire.  To check for a vacuum leak, spray carb cleaner around all the
surfaces of the intake manifold while the car is running.  A decrease in the
RPMs would indicate a leak,  Then try tightening up the offending area.

Safety Fast!

Randy