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.
| FUEL TRIM LEAN DIAGNOSIS 04/02/2025 in the Technical Theory Forum Had a vehicle in recently with a P0171. It was long term trimming at 20% and short term varied between 5-15%, depending on how it was driven. This was true at idle and all through the various throttle, load ranges. Assuming fuel pressures were in spec, th... | ||
| Brake Pad Wear Sensing Strategies & Circuits 03/21/2025 in the Technical Theory Forum I'd like some feedback, First the background: I'm reviewing a brake training program. It claims that all pad wear sensing systems are the same and simply ground the warning light circuit to turn on the light. That's it, nothing more! This was accurate on ... | ||
| SAS calibration after wheel alignement 02/10/2025 in the Technical Theory Forum Do we have to reprogram the SAS sensor each time we align a vehicle? some shops never recalibrate the SAS sensor after an alignment and never have any consequences. Others do it by default but are subject to customer judgment. When a car came in with a st... |
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