How do you know when it’s time to flush coolant? Technicians may have different views on the subject, but Dorman Training Center instructor Pete Meier explains how using a test strip at every service is a surefire way to get an accurate picture of the coolant’s health.
With the variety of electronically controlled systems on a modern automobile, the days when a test light or simple voltmeter was enough to diagnose problems are long gone. Using a digital storage oscilloscope (DSO) can make troubleshooting faster and more accurate, and open doorways when tackling a range of electrical and engine driveability problems.
But first, you have to learn how to use it. You can access more online in the Dorman Training Center.
Take your new scope journey even further with this video.
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Technician A completed a compression test, noting high readings suggest an exhaust restriction, while Technician B says the test checks volumetric efficiency.
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.
Diagnosing the cause of a battery drain can be a challenge today.
Need a smooth finish on a part you’re cleaning up with a file? Lemmy shows how draw filing can achieve a clean result with a totally different method of holding a traditional file.
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