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Repair Topics / Engine Tachometer
Car and Truck Engine Tachometer Question This
category contains featured questions as
examples. They relate to most vehicles.
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 / Engine Tachometer
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