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Hunting Laser
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CarGuru > Open discussion > Hunting Laser 28 April 2005 07:58:27

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Hunting Laser

Nirodac 28 April 2005 07:58:27
 OK, here's my problem.
1991, 1.8 liter Plymouth Laser.

At idle the engine rpm hunts up and down between about 1000 and 1500
rpm. After about a week of driving, it seems to settle down at about
700 rpm. There is no problem will driving the car, pickup is good, and
there is no sign of throttle hunting, the tach has a constant (but maybe
higher than normal) reading. It's only when the clutch is depressed or
the car is in neutral that we have this problem.
There seems to be a cycle of three swings every 5-8 seconds. On the
down side of the last cycle it seems to drop slower than on the previous
swings c.
This is really pronounced after the battery has been disconnected,
sometimes.
The idle position sensor tests ok at idle, closed at idle, open when off
idle, and throttle cable is lose.
The throttle position sensor test OK, 5k ohms, in spec, according to the
service manual (I can watch the resistance change as the throttle is
changed).
The throttle motor position sensor varys when the engine is hunting. As
well the static test shows the resistance of the sensor(about 5K ohms)
is within spec. Didn't try the portion of the test that calls for
energizing the throttle motor though.
No check engine light.

I've emptied two cans of ether trying to find a vacuum leak, no luck, no
leaks.

I've run out of ideas, any suggestions??







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CarGuru > Open discussion > Hunting Laser 28 April 2005 07:58:27

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