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Automotive Technical Theory Forum

Professional automotive forum for discussion of the theory of operation for any automotive system or component. Discussions include electrical and electronic theory, engine propulsion theory, fuel system theory, ignition systems theory, and much more. This forum is for experienced automotive repair professionals only, membership required.

Continue to the description of our next automotive discussion forum, the Technical Tips Forum.

Recent Automotive Discussions in the Automotive Technical Theory Forum

Variable fuel pump control
01/08/2024 in the Technical Theory Forum
[Driveability: 15 Lexus NX200t 2.0L] We are trying to understand how this system works and Lexus is not very forthcoming. Playing with fuel supply pump. No start situation. Vehicle is not damaged, no history. If we supply power to light blue it starts an...
Boost while running, or not?
12/26/2023 in the Technical Theory Forum
I just watched a familiar face in a you-tube short give some boosting advice. Don't leave the good car running, he says. "...it's alternator is spinning, and when you jump start it to the other car, when that car starts, that alternator will start spinnin...
Why so much trouble with diesel emission systems?
12/16/2023 in the Technical Theory Forum
In the early stages of my career we had "2-gas" exhaust analyzers. They measured CO and HC with some degree of accuracy. There were relatively effective at determining and adjusting fuel mixture in applications that did not have any air injection or catal...

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