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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

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...
Fisher plow motor amperage
02/18/2019 in the Technical Theory Forum
[Electrical: 13 Chevrolet Silverado 2500 HD LT 6.0L] I thought it would be a good idea to ask some of you guys in the snowy states for some help on this on. Last week, this customer had a new XV2 Fisher plow installed on his truck to replace his older on...
4 Wire AC Pressure Sensor Voltage to Pressure Conversion
02/15/2019 in the Technical Theory Forum
[HVAC: 98 Mazda 626 DX 2.0L] The late model European Mazda 626's have a four wire AC pressure sensor / switch with four wires. I was wondering if anyone has a voltage to pressure conversion for these sensors? The AC on this specific car doesn't cool at a...
Greatest cleaner on earth.or another wallet flush?
02/14/2019 in the Technical Theory Forum
We've recently started using Terra Clean products(not this particular one though) and the ESO found this video and sent it to me. Admittedly,his explanation of how it works sounds like Greek to me. Educated opinions welcome.
Ford Smart charging systems
02/10/2019 in the Technical Theory Forum
I need help understanding (and fooling)the PCM on a vehicle with PCM controlled charging system. The car in question is a 2011 Ford Crown Vic PI that threw a rod and now has a 1998 4.6L DOHC engine from a Lincoln Mark VIII in it (for off road purposes of ...

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