Richard Ewald wrote:
> A problem such as this can be caused by several things. Paul
> mentioned misfire and high voltage break down. This is a strong
> possibility. Your B probably needs about 10-12K volts to fire the
> plug at idle. Open the throttle and it might take up to 20K volts.
> If your car's plug wires start firing to ground at 15K volts it will
> run fine at idle, and low throttle openings. A large throttle opening
> will cause the engine to misfire and no acceleration.
> A low output from the coil could also cause this. If there is not
> enough voltage going into the coil due to poor connections this could
> show up. It could be a bad coil, but honestly, these are real rare.
> Coils almost never go bad.
> These are just some of the reasons that back in the day tune up shops
> had O-scopes in them. About 30 seconds on a scope and I could nail
> the problem.
> I very seriously doubt it is a vacuum leak. As a percentage of total
> air going into the engine a vacuum leak is greatest at idle. A vacuum
> leak having an effect at 3500 RPM would require a huge leak, and I
> doubt the engine would idle.
> Stuck carb pistons could cause such an issue, but I would look at the
> electrical stuff first.
Another possibility would be a clogged fuel filter or weak fuel pump.
-The Roxter
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