When I first started in this business, you could diagnose most running problems based on a generalized set of rules. Of course, this was in the day of carbureted engines and mechanical ignition systems. Today, the Engine Control Module (ECM) does a p
When the 4.6L first appeared under the hood of brand new Crown Victorias back in 1992 (Town Car got it a year earlier), those of us who pounded the concrete and pulled steel in Ford dealership service departments expected a host of new problems. You
Vehicles sitting on car lots can experience a lot of problems because they sit for long periods of time. Batteries aren't unhooked, and can drain. On this Dodge Caravan, the driver door lock was malfunctioning.
A window that won't roll back up is not the only power window complaint you may face. Other common faults are windows that only move partially through their travel before grinding to a halt, work in one direction only or no longer respond to their au
The Jeep Wrangler belongs to a fellow employee and just needed a routine oil change. A simple task, right? No matter what the customer complaint is, I always do a complete visual inspection so I can advise my customer on his or her car's current cond
There are hundreds of color-coded wires on every vehicle, some of them carrying loads, but many more conductors these days are carrying delicate signals that require almost no current at all through tiny little wires.
This van is kicking me around, Donnie told me. I had been out of the field for a few years, having traded my toolbox for a grade book, an office and classroom, laser pointer and a lab full of automotive students. My old friend and fellow drivability
Diagnosing circuits operated by a control module is not as hard as many techs think. Like any diagnostic situation, it all comes down to understanding how the module operates. Control modules are computers programmed to carry out specific functions.
Most automotive repair professionals have a working knowledge of the operation of the basic oxygen sensor. However, newer wideband designs are more sophisticated and often misunderstood by even the most experienced technicians.
As long as vehicles have been rolling, the speed of the load-carrying wheels has been an issue. When I was a young boy watching western movies in the 1960s, I could always tell when a wagon was going to crash, because the camera would focus on a wood
To troubleshoot any power door lock system, understanding that particular system is key (pun intended). In the beginning, power locks basically were reversible motors with a threaded armature that would spin around a rod with matching threads. Spinni
The operation of electric cooling fans is not complicated, and troubleshooting a loss of fan operation usually is pretty straightforward. This month, we'll share a few tips on diagnosing common faults.
No-crank or slow-crank concerns are among the most common customer complaints we deal with as automotive service professionals. If you can verify the concern, these are relatively easy to diagnose when compared to the myriad of possible engine perfor
For more than 40 years, the auto industry has devoted a major portion of its engineering resources to reducing exhaust gas emissions. In the U.S., it all began with positive crankcase ventilation, introduced in 1967. Air Injection Reaction (AIR) was
Vehicles today feature more safety technologies to keep vehicles from being in an accident, including changes to the brake systems, stability control and new blind spot detection. Here's a description of some of the systems you'll see in your bays to
You don't use one testing method to dianose drivability problems, do you? In fact, I bet you know more than one technique for testing nearly every system on the car. We learn these various techniques in order to accurately troubleshoot the problem at
Today's cars are getting more and more electronic, with computer modules controlling engine management systems to automatically turning on the wipers at the first hint of rain. Diagnosing problems in these circuits can be involved, and the more testi
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