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There are a couple possible reasons. It could be a cracked carb boot that is letting unmetered air into the engine causing a lean condition. It also could be a cracked crank seal causing this problem. Check your plugs to see if it is running lean. Spray carb cleaner onto the carb boots when it is running to see if theres an idle change.
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What does a vacuum leak do to a 1998 Plymouth neon espresso?
High idle, misfire, check engine light,High idle, misfire, check engine light,
What causes a 1998 Chevrolet 305 engine to idle high?
Check throttle positioning sensor.
How do you move the idle tensioner for a 1998 3 liter dodge?
"How do you move the idle tensioner for a 1998 3 litre dodge?"
Where is the idle speed control motor on a 1998 ford escort ZX2?
where is the idle control motor for a 1998 ford escort
What would cause 1998 jeep wrangler to idle high after it warms up fuel pressure regulator i have replaced idle sensor?
Unmetered air sneaking in to the intake. Look for vacuum leaks.
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How high is your idle? idle should be 800rpm good oil pressure is obtained at this idle
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You don't. The ECU controls the ISC (Idle Speed Control Motor) which adjusts the idle. If idle is out of control (too low or too high) try gently tapping the ISC with a small (0.5 pound) hammer or a large wrench while the engine is running. If tapping the ISC makes a change in idle speed, you need a new ISC. Clean the throttle body whenever replacing the ISC. If the ISC is not the problem, look for vacuum leaks which can cause both high and low idle. Low coolant level can cause high idle. Also, note that many clueless drivers assume that the idle is wrong (high) when the car is just using high idle (normally) for a short time after a cold start especially in cold weather.
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how can I clean the Idle Air Control Valve on a 1998 Nissan Frontier
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Vacuum leek
How do you adjust the idle in a 1998 Cadillac Catera?
You cannot adjust the idle in a 1998 Cadillac Catera. It is computer controlled. If the idle is not at 750 rpms then there is another problem with the engine. Check for codes with an OBD2 tester.
Why would a 1998 Ford Windstar start running only at high rpms?
Either the throtle cable is hanging or the idle control solonoid is not working
What would cause 1998 Jeep Grand Cherokee to idle high and check engine light to come on?
most common cause, a vacuum leak.
