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September 29th, 2008

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Q & A: MGB Popping

Saturday March 30th, 2002
Q & A, MGA, MGB, MGC, MG T-Type, Midget
John:
My problem relates to a 1977 MGB (Canadian edition).
The relevant facts are as follows:
The car was brought out of storage recently after many years of beauty
sleep
(BTW - I am the original owner and the car has but 10K miles on the
odometer.)
The stale gas has been siphoned out of the gas tank and new spark plugs
installed.
After getting the car back on the road, it was backfiring and "farting"
whenever I lifted off the accelerator - I replaced the gulp valve and the
backfiring problem was relieved.
However, whenever I lift off the throttle, it still "farts" and produces
some fireworks at the tip of the exhaust pipe.
Your guidance would be appreciated.
Regards
Ron Wieleba

RON!

Nearly all cars with working air pumps give a subdued "pop-pop-pop"
on deceleration. This is not uncommon on other vehicles with faulty
exhausts. In both cases, fresh air is entering the exhaust... read more