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International Automotive Technicians Network

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

O2 / Tomato Sensor Operation
01/19/2018 in the Technical Theory Forum
In a discussion from 2007 about the operation of O2 sensors, one of the participants cited a "Berkley" paper, SAE 930352, Static Characteristics of ZrO2 Exhaust Gas Oxygen Sensors. The given link was dead, but I was able to find a partial copy via the Way...
BMW Relarive Compression
01/18/2018 in the Technical Theory Forum
I just performed a relative compression test on a 2003 BMW 330ci, 3.0L inline 6 with my scope. The peaks of the waveforms were at 1,600 amps. Is this normal to be seen on a BMW? I am not trying to diagnose anything, just curious as to what is normal ...
Intake Carbon
01/17/2018 in the Technical Theory Forum
[Driveability: 11 BMW 335d 3.0L] New customer and new issue in our shop regarding Diesel with intake carbon build up. BMW dealer diagnosed and we confirmed codes for Swirl Flap actuator, EGR recirc. rate control, EGR gas temp sensor. All related to exces...
Bank 2 cams not turning
01/12/2018 in the Technical Theory Forum
[Engine: 11 Porsche Panamera 4 3.6L] I have read about this, but my 1st one. Towed in, lots of codes. Tries to run on 3 cylinders. DME (Digital engine electronics) ( 11 ) Abnormal P1583 Sport mode not available P1023 Fuel pressure/quantity too low at st...
Preventative maintenance
01/10/2018 in the Technical Theory Forum
[Engine: 17 Chevrolet Suburban LT 5.3L] Hello fellow IATN members, I purchased a 2017 Suburban new one year ago for my wife. My question is what recommendations you might have to prevent carbon build up. I serviced it at 3,000 miles with 0w20 Mobil one o...

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