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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

Milky Diesel
11/19/2019 in the Technical Theory Forum
Does anyone know what causes milky diesel like this? Customer has a tank on his yard that he gets it from. Not separating yet, but may later. Vehicle runs terribly, all the injectors are ruined. Can’t figure out what caused it. Smells pretty close to...
Reverse Coil Polarity
11/19/2019 in the Technical Theory Forum
Hi all, had an interesting discussion with a student today who asked me what would happen if the primary wires were reversed on an ignition coil. I have personally never experienced this nor given it much thought to be honest. So I found myself struggling...
11/19/2019 in the Technical Theory Forum
Hello gentleman I’ve quick one here. I’m trying get my hands on ADAS calibration, going to purchase stands, targets, etc. I wonder, do I need to be online and logged in to perform calibration or not? Thanks.
Misfire Counter
11/09/2019 in the Technical Theory Forum
Vehicle came in for normal service and CEL. Felt rough at idle and smoothed out off idle. Pulled misfire code for cylinder four. Plugs and cylinder 3 coil done 40k ago. Knowing there is a high failure rate on these coils, sold cylinder one coil and s...
Wheel torque
10/28/2019 in the Technical Theory Forum
I have seen so many problems with lug nut torque and customers coming back with loose lug nuts I have to rethink my procedures. I just tightened the lug nuts on a jeep and I had torqued them to 120 foot lbs with the torque sticks (that I have tested with ...

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