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The inlet manifold is leaking air, weakening the mixture, OR the engine timing/sparkplug electrode gap is outside specified limits.
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Can a bad battery cause a car to idle high?
No, that has nothing to do with idle speed.
Dodge 318 engine noise knock at idle?
Added info to question: Vacuum also coincidently went from steady 20psi to 15psi/knock - small backfire/miss on acceleration from idle. Knock is steady at idle.
What happenes if the Idle speed in a car is too high?
the engine runs at a faster rate than when the idle speed is lower.
How do you adjust the idle speed of a 1993 jeep wrangler the idle is set to high?
Idle is computer controlled and can NOT be adjusted.
94 SC1 how to adjust the idle speed The rpm's is at 1600 at idle speed to high?
change the TPS Throttle Position Sensor
How do you fix high idle speed for 1996 jaguar xj6?
May be idle position sensor.
Why does dodge Aries idle high?
Could be the carburetor/idle speed out of adjustment, possibly a vacuum leak
How do you adjust idle speed on Hyundai Accent?
it seems there a small screw back of the intake but the idle is control by the ecu.
How do you adjust the idle speed of a 1999 jeep wrangler the idle is set to high?
Idle is not adjustable. You have a electrical or vacuum issue that needs diagnosed.
How do you set the idle on a 1988 ford Thunderbird?
Not really possible. There is an idle speed control on most 1988 v6 machines. If you are experiencing high idle, it may be a broken ISC. The idle speed is controlled by computer. http://www.marksatterfield.com
How do you adjust idle on 1998 ford escort?
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.
How do you adjust the idle speed of a 1997 jeep wrangler the idle is set to high?
You shouldn't have to, check for vacuum intake leaks
