Question about 1988 Plymouth Sundance

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The engine has recently started to idle very fast when the car is in park, and tapping the gas pedal doesn't help.

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Examine all the vacuum hoses as one most likely has cracked, usually at a bend or
has come completely off. This will cause very high idle.Hope this helps.

Posted on Apr 01, 2011

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Is the check engine light on? Check the IAC valve this adjust your engine RPMs when a load is put on your engine,such as a/c-power steering,brakes,ect.check by unpluging the electical conection,start the motor for 30sec,shut off,disconect battery for 30sec,hook battery back up and electical plug to IAC,start engine,if this does not correct the problem replace the IAC valve,

Posted on Apr 01, 2011

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1 Answer

1996 ford escort lx engine runs to fast


If it idles high, with it in park, block off mouth of throttle body with something, it should kill the engine. If very little or no effect on idle, you have false air getting in there from somewhere.
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Put parking brake on to park my Caravan. Went to start it, released the parking brake. Press the gas pedal, put the van in gear, it wont go forward or reverese. What should I do?


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I have a 2002 PT Cruiser. On a cold start it starts on fast idle which is excessively fast. It is actually unsafe to put the car in drive. It will stay on fast idle for 5 minutes before dropping, but then...


code p 1193 refers to inlet air temp sensor problem --circuit high
a faulty ambient air temperature sensor or barometric pressure sensor will cause this effect as the idle control in the ECM is not getting correct temperature readings to set idle speed

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What kind of carb does the 76 c10 4x4 come with need to adjust


mcdevito75 here, The fast idle is needed when the engine is cold to make the air and fuel mixture rich to keep the engine running while cold, the carb. choke doew this with a bi-metalic spring in that balck round box on the side of the carb, a screw also hepls keep the choke closed until warm up, this screw can be adjusted tpo control how tight it holds the choke cloesed, here"s how to adjust this screw to slow fast idle speed, Locate on the carb, where the gas pedal connects, have a friend operate the gas pedal with the engine off, once you locate the linkage, you"ll also see 2 screws with springs around them, 1 is for fast idle the other for regular idle, you want the fast idle screw, notice this screw will lay against and Half moon shaped tab, while the other screw lays against a shaft, you need the screw that lays against the half moon shaped tab. Start the engine and step on the gas pedal slightly and relaease, at the screw that lays against this half moon, simply turn it counter clockwise or toward you just 1 2 or 3 turns very slowly, you'll hear the fast idle come down but you don"t want the fast idle to low, listen to the engine very carefully, slow it down just a bit, it should still race though but not out of control. Of course for a full carb, adjustment the shop should handle that., but this info will help.

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1 Answer

Cranks right up but cuts off immediately unless the gas pedal is pressed


IF YOU RECENTLY UNHOOKED BATTERY OR HAD DEAD BATTERY THE COMPUTER WILL NEED TO RELEARN IDLE STRATEGY,START VEHICLE KEEP IT RUNNING AND DRIVES ON 2OR 3 MILE RUN SHOULD BE SUFFICIENT IF THIS DOESN,T WORK LOOK FOR VACUUM LEAKS IN ENGINE COMPARTMENT OR POSSIBLE BAD IDLE AIR CONTROL LOCATED NEAR THROTTLE BODY

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1 Answer

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Carbureted models have a fast idle cam on the throttle,It is a screw that sets against a movable part,called the cam,when the engine heats up,the cam will drop upon tapping the gas pedal.Set the carb,while the engine is cold,by tapping the gas pedal,then adjust the fast idle cam screw by turning it in,with the engine running.Start out by turning the screw in a full turn before starting engine so it will run,then adjust the screw as the engine runs.

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Engine will start at very low idle, sometimes killing, then may fast idle, then low idle, back and forth. What may cause this?


check and make sure air filter is ok, and there are no restrictions in hose to throttle body, check iac (idle air control.

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1 Answer

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