Does you '69 still have its emission controls? If so, I would check the
glup valve on the intake manifold, air pump, and the check valve on the
air injection manifold.
If necessary, the original gulp valve can be replaced with a readily
available Nissan part. I have the p/n at home.
Good Luck,
Dave
RETWIZBANG@aol.com wrote:
>
> I've been patiently trying to get a 1969 MGB to run for about a month. So
> far, I have cleaned and sealed the gas tank, installed all new fuel hoses,
> filter, tune-up, and I switched the Weber which came with the car for
> original SU dual carbs. I have the same symptoms as before - BACKFIRE -
> through the exhaust and carbs. The car idles fine, but as soon as I rev, it
> backfires like crazy - the mothers grab their youngns for fear of a drive-by
> shooting (automatic weapons fire). Any clues? Thanks.
>
> Rich Townsend
> Manassas, VA
> 69 MGB
> 75 TR6
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