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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

BMW CAN lines
05/13/2021 in the Technical Theory Forum
[Driveability: 06 BMW 530xi 3.0L] I have no communication on the CAN bus for this vehicle. I have scoped the CAN lines, and have disconnected every module connected to it, with no obvious change in the waveform. With the gateway disconnected, I lose all ...
2007 nissan altima 2.5 used pcm
05/01/2021 in the Technical Theory Forum
I've a tech help post going on a P0075 for vvt solenoid circuit issue, not many replies, but fairly sure its pcm issue as its fully grounded, yet diagnostics don't acknowledge it could be a pcm. My question is can a hook up a used one just to check circui...
Drive By Wire (For Dummies)
04/23/2021 in the Technical Theory Forum
Interesting he never mentioned emissions. Nice elementary explanation.
1969 GTO restoration & comedy of errors! Cost over runs!
04/21/2021 in the Technical Theory Forum
[Miscellaneous: 69 Pontiac GTO 6.6L] S [1969 Pontiac GTO, Photo] So there we are, working on an old project that had many different hands involved in a complete restoration project. Our mission was to make this complete rebuild engine, transmission, carb...
2013 Toyota Tundra Cam Towers
04/20/2021 in the Technical Theory Forum
[Engine: 13 Toyota Tundra 5.7L] Hello all, I am working on a fairly clean 2013 5.7 Tundra w 130K I am replacing the cam tower seals which I have never done before. The job seems straight forward. My question is what other parts typically get replaced on ...

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