QuestionThe car idles well but when I accelerate the car misses and backfires but having reached 20mph works fine. The SU`s damper pots are topped up with oil.
Running her in the garage as soon as you open up the throttle she starts misfiring the as the engine picks up revs it works fine?
AnswerHi Robert:
Your description makes the diagnosis a bit tricky, which means it could
be one of several things, so lets look at the most likely first.
1. The fact that she is only having trouble taking the gas at first, points
me into the direction of the fuel pump. If you have the original pierburg
fuel pump, it could be going bad. If you have noticed a humming from the
fuel pump when the ignition switch is on, that would be a good indication.
Tapping the fuel pump with the handle of a screw driver a few time will sometimes
temporarily fixed the problem.
2. Also, check your spark plug wires by re-seating them. One could be loose and
this would cause arcing initially, but would settle down and fire correctly
at higher speed. Also a foul plug would exhibit this behavior until hot.
Let's eliminate these two items above before looking elsewhere.
