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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

How does the PCM know the engine vin?
07/31/2021 in the Technical Theory Forum
Just read this article How does the PCM know the replacement engine is not the one originally in the car, & what is different about an OEM certified replacement engine?
Vehicle won't shut off
07/29/2021 in the Technical Theory Forum
[Electrical: 14 Dodge Dart GT 2.4L] This Dart has a curious condition: it will start and run just fine (it has Push-button start) when KIN is pushed, but will not shut down when the button is pushed. A message does appear on the IP after a shut-down atte...
pcv system theory and operation gm 1.4 and 1.8
06/30/2021 in the Technical Theory Forum
i was posting this for clarification on how the crankcase is evacuated . I cannot find any way system pulls any fresh air to displace crankcase vapors.
Can I use 23 month old 50/50 coolant-distilled water mix?
06/17/2021 in the Technical Theory Forum
Hi all, I'm about to change my Coolant again for maintenance. When I changed it last time, I bought a new gallon of P--stone Ethylene Glycol based green antifreeze and a gallon of distilled water. I mixed the two together (in two jugs) for a 50/50 mix of ...
Cleaning primary convertor debris from secondary convertor
06/02/2021 in the Technical Theory Forum
[Driveability: 11 Volvo XC90 3.2 3.2L] The manifold convertor disintegrated and the particles have plugged up the secondary convertor. I've been able to get the big chunks and a good bit of powder out of it but it is still partially plugged. Is there any...

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