Engine popping under a load with HEI

[RACR_73s]

Try the toggle switch for the ignition next to the push button for the start. Happened to me a few years back and I chased it for several weeks at the end of the year and through all next years practices. Lots of frustration for a $5 part.

[Bubstr]

Try the misting from the windex sprayer. It makes them shorts show up. If it's popping, you have a spark jumping. You can't ride on the fender under load, so you help the short show you where it is. If it's popping, that indicates a wrong cylinder getting spark at the wrong time. Look to spark jumping from wire to wire or cap or coil.

This method does two things. It puts some load on the engine by revving and braking, even if it don't pop and bang and it helps conduct that spark jumping that causes it. Try it, you'll like it.

Last thing use good wires with soldered ends and never pull wire off a plug with the wire.

[LimitedLM06]

had a buddy have the same problem last year. Bad toggle switch was the problem.

[LimitedLM06]

remember that an HEI MUST have 12 volts to run properly. any less and you have problems.