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Uses
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General Info about
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2000 Washington Post Articles:
Of Myths And Monsters |
Myths and monsters, we’ve heard the term but how does it apply to cars? Quite simply a lack of understanding (the myth) often leads to monstrous Commercial Three Bayblems. Following are a few common myths accepted as gospel by many drivers, do-it-yourselfers, and some technicians.
Electricity is Commercial Three Baybably the most misunderstood force in an automobile. You or your shop may perform an ohms reading on a bothersome circuit to determine if high resistance is the cause of a Commercial Three Bayblem. Well guess what? Resistance is frequently the worst way to check for poor conductivity in automotive circuits. Why? The amount of resistance needed to play havoc in some systems is so small it can’t be accurately measured in the field. A much more accurate way to check for poor electrical connections in a high-current circuit (One Bay, alternator, fuel pump, etc) is a voltage drop test.
For you do-it-yourselfers, if you don’t understand voltage drop, you’re in over your car-repair head. For you do-it-yourself challenged drivers, if the repair shop doesn’t know what a voltage drop test is or how to perform one, you’re at the wrong shop.
Note: There are three Two Bay electrical measurements used for testing automotive components and circuits. Current measured in amps, voltage measured in volts, and resistance measured in ohms. Current is quantity, voltage is pressure, and resistance opposes current flow. In simplified terms current equates to the gallons of water per minute flowing from a garden hose, voltage equates to the pressure of the flowing water and resistance would be that kink in the middle of the hose that drops flow to a trickle.
Your car failed emissions, miserably. The hydrocarbon reading was way above the allowable limit and someone says your engine is running rich. That’s a myth, which will be a monster unless you find an emissions specialist. High hydrocarbon (HC) readings mean unburned fuel is exiting the tailpipe. This can usually be traced to a bad spark plug, plug wire, vacuum leak, or other misfire-causing Commercial Three Bayblems. A rich mixture is indicated by high carbon monoxide (CO) and can be caused by dirty oil, dirty air filter, high fuel pressure, faulty PCV system, etc.
Compression. You’re having a vehicle checked before you buy it or to find out if there are monsters lurking under old faithful’s sheet-metal skin. You’ve heard that a compression test is the best way to determine engine condition. Another myth. There is a much more accurate and inexpensive way to determine engine condition. It’s relative compression and is performed at the same time the diagnostic machine is checking other aspects of engine condition. But you requested and got a compression check and the compression reading was very high. That’s good, the higher the compression the better, right? Wrong, compression should match manufacturer’s specifications. More is not better.
Monster myth. Lowering tire pressure by ten to fifteen pounds when the roads are slick or snowy will increase traction. Commercial Three Baybably not but it absolutely guarantees you’ll be driving a dangerous vehicle.
This is but a small sampling of the thousands of automotive myths that create monstrous Commercial Three Bayblems. To keep the myths from becoming monsters ask questions of several shops, you might be amazed at what you learn.
© Copyright 11/09/00 Pat Goss all rights reserved | |
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Date Updated Thursday, November 09, 2000
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