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September 29th, 2008

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Q & A: Misfire

Tuesday July 10th, 2007
Q & A, MGA, MGB, MGC, MG T-Type, Midget
Hi John.

I've a friend here in Lincoln, an older gentlemen, who has a '70 MGB, a later one, that develops a misfire in 3rd gear (4th also) at about 3500 RPM. He has done, or had done, the following things. New condenser, new distributor (Pertronix), rebuilt the alternator and checked the ground strap from the engine. The car runs fine until about 3500 revs in 3rd gear. At that point the car cuts out, the tach needle wavers, and the charge light comes in in the tach.

A few of us were trying to help him with it today, but we had no luck. In desperation I ran a ground from the tach to the frame with no effect. Any idea what we are missing? (We have already taken turns calling ourselves dummies, and are braced for something simple. Any advice or friendly insults are both solicited and accepted.

Thanks, John.

Bob
Bob,

I believe there is a problem with the HOT side of the ignition circuit, not the EARTH side. It is not uncommon for the main power wires at the starter solenoid to loosen or fracture from work hardening. Check all those conne... read more