Four proven ways to run a tighter ship at your shop.

Spend any amount of time in the auto repair industry, and you’ll hear customers sharing strange ideas about the “right” way to drive and care for their vehicles. We assembled a list of common and confusing advice, then asked the gang to weigh in on some very questionable practices.
Technician A and Technician B are discussing ways to use fuel trim as a troubleshooting aid. Technician A says that fuel trims that are correcting for a lean condition at high RPM and load conditions indicates a problem in fuel delivery. Technician B says that this condition is caused by a vacuum leak.
Technician A is diagnosing a misfire. He states that a misfire is caused by a fault in the ignition system and that new plugs and coils will repair the problem. Technician B says that a misfire is detected when the ECM detects a variation in crankshaft speed.
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