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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

GM oxygen sensor code strategy
09/16/2021 in the Technical Theory Forum
[Driveability: 16 GMC Sierra 1500 Denali 6.2L] This is one from last week that's already fixed and gone, but it got me to wondering about the theory behind it. I was given this truck for a complaint of rough running and MIL on (it barely made it to the s...
Ford APIM SYNC technology
09/15/2021 in the Technical Theory Forum
[Electrical: 17 Ford Explorer XLT 3.5L] Hey group I have a question about Ford's APIM tech. I've dealt with a lot of different issues with radio screens missing partial menus, not turning on, no audio, etc. I always have to send them to a Ford dealer bec...
Self Excitation Alternators
08/30/2021 in the Technical Theory Forum
I kinda morphed a different discussion into a totally new topic of 'self exciting alternators' so I'm restarting it here. from the previous thread.............................................. I am familiar with generators with field coils wound around so...
loss of power
08/24/2021 in the Technical Theory Forum
this is a hybrid vehicle. Customer wants plugs and coils due to power loss. No codes no misfires. What I do notice, on my scanner is the SOC (state of charge) is down around 60% and drops when you climb on it. I believe that the low state of charge in the...
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?

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