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.
| Excessive Fuel Trim (Extreme Negative Values) 11/07/2025 in the Technical Theory Forum [Driveability: 16 Chevrolet Malibu LT 2.0L] 2 [2016 Chevrolet Malibu LT, Engine/Propulsion Photo] [2016 Chevrolet Malibu LT, Photo] 2016 Chevrolet Malibu LT 2.0L 8-spd VIN: [...] This vehicle was sent to us by a salvage yard that had sold the installer a... |  | |
| intermittent miss and no start 09/04/2025 in the Technical Theory Forum [Driveability: 10 Ford Mustang 4.0L] checked this for son a couple times ran good for me. has run rough for him at times and no start after hot soak a couple times. he waits then starts and runs good. has code p0443. I diagnose this using alldata diy all... | ||
| Stepper Motors 08/23/2025 in the Technical Theory Forum Servo motors, 3-phase BLDC motors and stepper motors are increasingly common on modern cars. They are even more common on EV's. And they are widely misunderstood (IMO). Stepper motors are especially unique and confusing. I first encountered stepper motors... |
Video