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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

Electric Vehicles
01/26/2021 in the Technical Theory Forum
I was watching the news of the storms in the mid-west and freeway parking lots and it struck me that as we go to more and more all electric vehicles (maybe even trucks) that there is going to be many requiring a tow after they run out of battery power wai...
01/24/2021 in the Technical Theory Forum
[Driveability: 04 Saturn Ion 1 2.2L] cat has a hole in it that looks like some how a 45 was inside the cat and fired outwards. the volcano shape directed exhaust gases at the shifter cable grommet and caused the lower dash to burn. anyone seen this and a...
2015 VW alternator charging information
01/17/2021 in the Technical Theory Forum
[Electrical: 15 Volkswagen Golf S 1.8L] This fine Golf is a bit of a challenge for us. It came in with fire suppression powder all over under the hood as a no start. Customer told us he was boosting it and the cables caught fire. We tested the battery an...
Alternator Output Fuses
01/12/2021 in the Technical Theory Forum
The October 2020 Motor Magazine "Foreign Service" Column is about a 300-amp fuse in series with the output of a 140-amp alternator. The alternator is on one side of the engine while the alternator's connection to the battery bus is on the other side, so t...
Using oxygen sensors to diagnose intermittent stall
01/09/2021 in the Technical Theory Forum
Customer with a GMC 4.3L (V6 with a distributor) pickup with very intermittent power loss/stall/ no restart. Was needing a tow every 2 weeks. Instead of spending all day to drive the truck, I sent it back with the owner and a data logger on the OBD2 port....

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