An engine exhibits a knocking noise. During a cylinder power balance test, the noise abates. Which technician has the correct diagnosis?

Don’t waste your time with codebreaking. Just grab a paint pen.
Chefs know a helpful hack to keep spaghetti from falling out of an opened bag, and the same idea happens to work perfectly for zip ties. Give it a try next time you have a pack of zip ties that doesn’t have a resealable closure.
A walk (or drive) through the history of gas and service stations.
Auto care news and advice you can use.
Ready to grow your shop’s business with fleet maintenance, service and repairs?
How many times have you seen a hub dust cap with ugly dents from a sloppy installation? A dust cap tool is a handy tool for installing caps on customer vehicles without damaging the cap’s appearance.
Do your customers know the benefits of magnetic oil drain plugs? Swap out their standard drain plugs to help protect against unnecessary engine damage.
A customer states the brake pedal falls slightly when the brakes are applied while starting the engine. Which technician response is correct?
In November 1988, two employees snuck a camera into AMC’s Kenosha plant for a farewell tour.
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Auto care news and advice you can use.
It might be time to rethink oil changes.
Inspection of a belt goes beyond the old standbys of checking for cracks and fraying.
On a car with disc brakes, what is the most likely symptom of a vehicle with rotors that measured out-of-spec for thickness variation when measured at several places on the rotor surface?
Peter Meier discusses the importance of testing coolant and how mechanics can use simple strip testers to keep cooling systems safe.
Dorman trainer Pete Meier turned me on to a handy new tool.
Nick and Lemmy check out a flex plate from an imported Japanese automatic transmission with very few miles under its belt.
Throw a set of these resettable “fuses” in your toolbox.
A defective harmonic balancer can affect the accuracy of ignition timing readings or a defective harmonic balancer can damage the crank. Which technician is correct?