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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

Ford Smart Charging
12/12/2017 in the Technical Theory Forum
Good evening all, I\'m seeking a lil more information on what the strategy and operation of Fords new smart systems. I have read Alldata and Fords actual operation information on this system, however feel like I\'m still lacking specific specs and st...
O2 sensor ground
12/12/2017 in the Technical Theory Forum
[Driveability: 05 Nissan Sentra SE-R Spec V 2.5L] "Just the facts, Maam." My car. Running fine, no mil. Service it, notice the main ground cable is broken off the trans. Look for supplemental grounds, find nothing significant, express surprise that it st...
PCV system, and screaming seals?
12/12/2017 in the Technical Theory Forum
[Driveability: 08 Chevrolet Malibu LS 2.4L] Shop calls, and says, "Got a weird one here...it's got a MIL with a P0171, high crankcase vacuum and a whistling noise at idle." To me, it's a classic case of the cam cover having PCV issues, so I give 'em some...
2005 Chrysler -83.2F o2 heater temp
12/09/2017 in the Technical Theory Forum
[Driveability: 06 Chrysler 300 C 5.7L] Codes p0031 p0037 p0051 p0057. All sensor heater low. Is anyone familiar with heater temp of -83.2F? all 4 sensors are at -83,2F. Daniel Lynn references this temp as indicating sensor disconnect when he tried to fin...
Megohm meter and transmission solenoids
12/07/2017 in the Technical Theory Forum
Recently diagnosed a couple of transmission solenoid issues in which the manufacturers information was quite lacking, codes were for gear ratio errors, both were intermittent. Obviously an ohm test from the disconnected TCM connector to the solenoids in t...

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