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It really depends on the make/model of your car. Suspects include: Idle Stepper Motor/control valve, engine CPU, fouled injectors, incorrect spark plugs
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∙ 16y ago
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Lawn motor idles up and down?
Either the fuel mix is adjusted wrong or the carb is dirty
Why would a 1999 Ford Contour shake or vibrate at idle?
I also wish someone would answer this question as my 1997 Ford contour does the same thing. It shakes and vibrates very bad when it idles and it idles really low. They set the idle up to make it so it wouldn't die so now when I start it it revs up really bad then it idles down then it idles down to low and shakes I also wish someone would answer this question as my 1997 Ford contour does the same thing. It shakes and vibrates very bad when it idles and it idles really low. They set the idle up to make it so it wouldn't die so now when I start it it revs up really bad then it idles down then it idles down to low and shakes
2001 Nissan altima 2.5 engine idles up and down Cleaned throttle body does computer need reprogrammed?
O2 sensor(s) needs replaced.
4.2 liter ford idles but dies when you try tp move?
If the engine idles and revs up okay in neutral, it is likely the torque converter clutch lock up solenoid.
Your 87 Nissan truck idles up and down?
check for vaccum leaks.
How do you tell if a 1993 chey p.u. egr valve is bad?
Start the engine, and spray a little carb cleaner around and on the EGR valve. If the engine changes sound are idles up are down then the valve is bad.
Why does my 2001 Lincoln continental service engine light is on and idles erractly?
Needs a Tune up
I have an 1992 Oldsmobile 88 It starts and idles good but will die win I drive the the car down the road what do you think is wrong will it?
Could be a plugged fuel filter, time for a good tune up.
What is wrong with your Briggs and Stratton engine that just keeps revving up and down?
The most comon cause of an engine that keeps revving up and down (aka surging) is a dirty air filter.
2002 ford pick up idles fast when first stated then idles low runs good going down the road but when you stop it idles low and rough?
It could be a dirty air filter or a dirty throttle body.
What is causing the high idle sound when you start your car?
Cars often idle fast when you start them up. The automatic choke will make the car idles fast for a while then the idle speed will slow down, once the engine warms up.
1993 buik Le Sabre idles up and down?
Listen and look for a vacuum leak. Could be anywhere.
