Okay, tell me how you diagnose a HEI module failure without a meter, by the side of the road.
Pssst - being a mechanic means knowing what tools to carry. A pocket scanner and a multimeter is a must - the multimeter is essential even on non-computer cars.
stick your known good spare in and see if it works.
Pssst - being a mechanic means knowing what tools to carry. A pocket scanner and a multimeter is a must - the multimeter is essential even on non-computer cars.
Psst! Did you know that battery operated gizmos don't work below freezing very well? And did you know they don't work at all at -10 to -40 degrees?