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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

obd2 question
03/10/2019 in the Technical Theory Forum
[Driveability: 03 Cadillac Escalade 6.0L] I am having trouble getting the oxygen sensor monitor(not the sensor heater) to complete. All other monitors have run to completion. I noticed today when I first started the car cold that the coolant temp. sensor...
03/07/2019 in the Technical Theory Forum
This may be a little unusual, 2012 Ford Super Duty, 6.7 diesel. Out in the field they could not get engine to start, one they got it started it kept running after they cut the key off, not a run away, just at and idle. An alleged mechanic of ours came alo...
injector waveform
02/21/2019 in the Technical Theory Forum
[Driveability: 91 Dodge Stealth R/T Turbo 3.0L] I have an old Stealth that I've been playing with. Won't start, cranks OK. Will run on ether. Fuel pressure is spot on, but there isn't any fuel getting into the cylinders. Timing is also fine. The vehicle ...
2013 F350 body control module
02/21/2019 in the Technical Theory Forum
Truck came in as a no start, many modules not communicating, found broken wire from bcm to battery junction box to turn on start run relay, got it running. Multiple other problems, bcm and instrument cluster not communicating until started, found another ...
ZVR reference
02/19/2019 in the Technical Theory Forum
Anybody know what the difference is between a zero volt reference signal and a ground? Working on an IC Coach body system issue and there are a huge number of circuits needing a ZVR connection to complete, but it just seems to be a ground that runs throug...

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