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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

excitation resistor
02/11/2020 in the Technical Theory Forum
[Electrical: 09 Hyundai Accent GS 1.6L] where is it? can it be serviced? how does it work? [excitation resistor in the charging system circuit. ] thanks mark.
2008 F250 trans function
01/29/2020 in the Technical Theory Forum
[Transmission: 08 Ford F-250 Super Duty XLT 6.4L] Well I am not much of a tranny guy but I have been asked to diagnose this one anyway. I have this Ford that has reverse but no forward gears. The tranny had failed and been rebuilt and is like this after ...
Blue Gas
01/09/2020 in the Technical Theory Forum
Has anybody here heard of "Blue Gas" as a fuel source? I was forwarded an article regarding it and I have not heard of it nor am I able to find information about it. Below in quotations, is an excerpt from the article written by a Nick Hodge in today's We...
Engine After-run Diagnostics and Functions
12/17/2019 in the Technical Theory Forum
A long long time ago I had a vehicle whose ECM was not getting any power at key on. The (87) relays were not energizing. The working theory at the time was that the ignition switch either sends a ground or a CAN message to the fuse box and the fuse box cl...
Internet Connected Vehicles
12/13/2019 in the Technical Theory Forum
For those of you who see and service the newest connected vehicles with internet on board, I am curious how the system is connected and how the system is configured into the vehicle, along with what type of service the system can provide. Does the custome...

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