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Alternator Testing For No Charge Conditions

If only battery voltage is present at the battery on a running engine, does this mean the alternator is “bad?” No, it does not. It only means that the alternator is not charging, but does not reveal...

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Diagnostic Procedures For Stop/Start Systems

When trying to resolve a complaint, code or no-start/no-crank condition on a stop/start vehicle, it is essential to know how the system operates. The problem may not have a complicated reason –...

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Lifter Deactivation

The basic function of a valve lifter is pretty simple. It sits on the camshaft and transfers the motions of the cam lobe up through the pushrods and rockers to open and close the valves. The size and...

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Repairing Wiring Harnesses

The Hippocratic Oath states a doctor shall “do no harm.” The technician’s oath is the same, but that we “do no harm” to a vehicle we are trying to diagnose or repair. This oath has become more...

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Air Filters and Fuel Trims

The modern engine measures two things extremely well: the amount of air going into the combustion chamber with the mass airflow sensor (MAF); and the byproducts that are generated by the combustion...

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Using a Scope

A secondary ignition waveform is not just about the coil; it is also about the resistance of the air and fuel mixture inside the combustion chamber. When you are looking at a secondary ignition...

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Diagnosing Misfires

What is a misfire? Is a misfire when the cylinder does not fire? Is it when the cylinder fires too soon or too late? The answer is “yes” to both questions. Some misfire complaints are a flashing check...

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Belts and Pulley Alignment

Drive Belt Alignment Alignment is key to the health of an engine belt. The belt drive system is designed to create friction between the grooves on the belt and pulley to transfer power from the...

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Can You Jumpstart an EV?

Here’s a real-world scenario: A customer brings their EV into your shop for service, and it’s been there for quite a while because the parts are on backorder. After a few weeks, you get in the vehicle...

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Tesla Model 3 TPMS Service

One of the first items to be replaced on any Tesla model are the tires. This is due to tire wear from the instant torque of the electric motor. When replacing the tires, you will have to service the...

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