Question about 1993 Lincoln Mark VIII

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Idles fast may car idles fast while running dose not idle down when stopped

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  • jasongorman Nov 23, 2008

    when i start my car the rpm's are up to about 2500 and wont go down. I changed the mass airflow sensor and an idle control sensor and it still does it.however if i unplug the airflow sensor when the car is running the rpm's go down to bout 1500 please help.

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Check for a intake manifold leak, we had some problems with seals used on the upper section of the intake on your engine, get a can of carb spray and spray it around the intake, see if the engine reacts, if it does you have a leak.

Posted on Oct 01, 2008

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3 Answers

I have a Ford 1990 f250 xlt 7.5 When starting revs up and down slowly then dies sometimes, why?


Clean the throttle body and idle air control motor(IAC) on the side of it. Mostly the IAC and the hole it sets in. Also check the air filter.

Apr 26, 2015 | 1990 Ford F250

1 Answer

My 83 Ford Bronco keeps cutting off at every stop. it puffs like it's fighting to stay on before it go's out please help.


Sounds like your Carb needs to be tuned. If that doesn't do it rebuild or Buy a new one.

When I get in my Chevy First start of the day I press the gas pedal to the Floor 2 times and then hit the key to start it and it starts right up at a fast idle then you have to manually kick it down to a lower idle by putting it to the floor and letting off real fast kicking it to a normal running idle.
It could benefit you to let it warm up a bit longer also. I have to give my chevy 5-10 minutes before I drive off in it..


Might try and run some fuel stabilizer through it. Stuff that will remove water and other things that will make your motor run worse (maybe run a better grade of fuel in it).


When was the last time you replaced the Spark plugs? That could also benefit you. Just the general tune up things could make a world of difference.


Also if it does this when the motor is fully warmed up you might turn up your idle as that could be a problem. Let me know what works for you.

Mar 24, 2013 | 1983 Ford Bronco

3 Answers

Engine idle speed too fast some times. idle speed


Three things to check for:

1) High idle switch is on..*(vehicle thinks AC is running but it isn't.
You can try turning on the AC and see if the engine slows down to confirm this one.

2) Sticking or worn out Idle Air Control or IAC, You might get a check engine light with this one.....you might not if it's a mechanical failure.

3) Simplest of all. A vacuum leak. You can get the engine vacuum read while running if you go to a mechanic with a vacuum guage or an OBD 2 ecu code reader. There should be specs on what vacuum levels are normal for you car at idle.

Good luck and be careful!

Dec 29, 2009 | 1996 Isuzu Trooper

2 Answers

I have a 2002 toyota camry 4 cyl and sometime it shuts down at stop sing or light it starts ritght a way but I am consern why it does it only at idle speed please give me some ideas


idle control valves are very commend on car if your engine seems to be running lower then 600 rpm idle control valve most commend

Sep 23, 2009 | 2002 Toyota Camry

1 Answer

1987 volvo 244 intermittent fast idle floods after shut down


The coolant temp sensor sends signal to the ECU and the ECU adjusts the idle RPM. When the coolant is cold, the engine requires more fuel to sustain idle with thick oil (oil gets thicker & more viscous when cold). This makes the engine to idle at faster RPM but it should settle down to 850 RPM or so after the coolant warms up. The sensor is nothing but a thermistor; a device that changes electrical resistance according to the coolant temperature.

Apr 05, 2009 | 1987 Volvo 240

1 Answer

88 dodge dakota has rough idle and stalls at slow down.


Change/thoroughly clean the idle control solenoid. It may be sticking and causing rough idling.
Cleaning it is unlikely to be more than a short-term solution.

Jan 07, 2009 | 1988 Dodge Dakota

2 Answers

Idles to fast


When I crank my truck it runs wide open for a minute of so and then it starts to idle down. What causes this? It is a 1992 Chevy S10 v6 pickup. How can I fix this problem? I have no manuel on this vehicle for a diagram of the engine at all.

Thank you. Dave

Oct 16, 2008 | 1992 Chevrolet S-10

1 Answer

Fast idle


I have a similar problem which seems to stop ,if after 20 mins of driving or warmed up engine if you stop for 10 mins the revs die to a more normal 1500 revs! it is a spanish car now living in theUK I think the problem is choke related.

Oct 14, 2008 | 1988 Volkswagen Cabriolet

1 Answer

Have a 1989 Honda Accord LX and my idle after warmed up, every time I come to a stop my car dies. I've changed plugs, set idle speed a number of times, it will run good for a few days and then it's right...


If you can keep the engine running with your foot on the gas at a stop it is likely to be the Idle control valve. Older Hondas' have 2 valves. fast idle control (which is prone to cause fast, or surging idle due to vacuum leakage) and the Idle control that takes over from the cold idle control once warmed up. They are located at the throttle butterfly assembly.

Jul 26, 2008 | 1992 Honda Accord

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