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Engine Tachometer
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Car Engine Tachometer Question
Question: 1998 Ford Taurus, mileage: 180,000. My Taurus has what I
would describe as a twitch in the tachometer. I first noticed it at freeway
speeds (65-70 mph) when going down hill. Presumably, letting off on the gas
a bit. Now it happens while in park or in neutral, with the a/c on or off,
and at any speed I am driving. The tachometer needle always bounces up never
down in rpm. At idle it will move up 100 rpm or so. At 70 mph, it has
jumped up as much as 500 rpm. When the tachometer needle jumps up it is only
for a second, then it returns to where it was. However, it will continue
jumping up and then back, like a twitch, for several seconds. The car has
recently had new PCV, fuel filter, and air filter. What could cause this?
Answer: If the spark plug and coil wires have not been recently changed,
this could be the source of your problem. Replace with new to repair problem.
Repair Topics /
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