| Emissions Crystal Ball |
 | Lambda
Parts of this article excerpted from Vehicle Emissions Diagnostic Strategies, by Sam Bell, available for sale in our online store.
Lambda is an accurate way to calculate the air/fuel ratio, based on exhaust gas measurements of CO, CO2, O2, and HC. This is a big deal. If your exhaust gas test equipment displays a lambda value, and you aren't using it, you are missing out on a potent tool that diagnoses engine air/fuel ratio imbalances immediately.
Here's why lambda is important: A ca ...
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| Hybrids |
 | Prius Service Opportunities
Welcome to our series on hybrid vehicles and new technologies that will be serialized over the coming weeks.
Forget about the hybrid system for a moment and look at the Toyota Prius as a car that has brakes and spark plugs and filters; a vehicle that offers profitable service opportunities. Let others steer clear of hybrids, while you steer them into your shop!
Brakes, oil and fluid changes, and filter replacements are all low tech, and easy to do. You’ll need to use recommended fluids a ...
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| Electrical Troubleshooting |
 | The Old Headlight Trick
Fuse-popping shorts in electrical circuits can be hard to locate. Younger techs have been known to incinerate a couple dozen fuses looking for a voltage short to ground, while the truly fearless among us simply install a fat jumper wire in place of the fuse, and follow the smoke from burning insulation. Neither approach will garner the "top troubleshooter" award.
Back in 2006, Sam Bell wrote an article in Motor magazine that mentioned replacing a burned fuse with a sealed beam headlight whe...
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| Thinkin' Out Loud |
 | Coincidence, Logic, and Statistical Improbability
The great fictional detective Inspector Morse didn't believe in coincidence, and most of the time, neither do I. But a normally mundane spark plug replacement turned into a bit of a mystery this past weekend, when two statistical improbabilities joined forces to scare the livin' bejeebers out of me.
Let me set this up. I normally screw in a new set of spark plugs every 50K miles. Yeah, I know the 100,000 mile tuneup is the love child of every OEM marketing department, along with its sibling...
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