It may be wrong-headed, but if the manual’s a tough read, I’d rather try to figure it out on my own first.

How do you decide if a job is profitable?

No engine vibrates when it’s shut down, so how does crankshaft RPM turn into vibrations and how can we ‘unwobble’ them?

Voltage and current measurements of components that exhibit dynamic resistance will not jive with calculated values if we insert the component’s OFF resistance into the Ohm’s Law equation.

Joe Vehicle Owner would buy a can of his favorite brand of spray carburetor cleaner, remove the air cleaner, spray the heck out of anything that looked like it had anything to do with carburetion, start the engine, then finish the treatment by spraying the remainder of the can down the carburetor throat while attempting to keep the engine running.

The effects an engine can have on the vacuum waveform.

A reciprocating engine will always vibrate when it’s running, and not just because some parts go up and down or in and out.

How engine temperature sensors work and what they influence. And, we’ll examine some unusual coolant temperature sensor monitoring methods employed by PCMs from different manufacturers.