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Because you have a bad idle control unit. It is located behind the glove box. It is a square unit(3x2) and is a black relay. It has around 25-30 electrical pin connectors.
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Why does your car rev drop when you accelerate on idling?
Um that's not right, that's a red flag. Get it checked out.
Why does my 1972 Ford Mustang with a ford 302 motor rev up and down while idling?
You have a vacuum leak at the intake.
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I assume that this is a petrol engined Mondeo The Mondeo's idle speed is controled by a sealed air system Most erattic idling problems are caused by an air leak somewhere in the system.
Is it ok to start a 2003 BMW X5 4.4 after four months of not running or will there be problems with the gasoline?
Just be gentle with it! The fuel should be ok. Start it up, resist the urge to rev. Let it idle for a min. Rev gently and slowley, do not exceed recommend rev's by the white lines around the rev counter. Drive, but let it fully warm through until you drive it like a BMW again!
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mite be the icv (located near the rev cable) that needs cleaning i had same problem idling around 400 and sometimes cutting out a carb cleaner will clean it
What would cause a 2001 aurora 3.5 to rev up to 3000 rpm and stay there while idling?
the idle air controll valve is broken. You will need a new one.
Low revs causes car to cut out?
You may need to adjust the throtle or idle of the car. In older cars this is as simple as tightening a cable. So when the car is just idling it will naturally rev higher and not stall.
89 Toyota sr5 4wd 3liter while idling will rev up and down over and over again Its really bad when oil is down around half also when the clutch is pressed in?
check your coolant level.
Can a incorrect engine timing cause a engine to rev up to 5000RPM?
Incorrect timing can cause several problems. One of which is high idling. 5000 rpm sounds high though, there may be other problems as well.
Why would a 1999 Mitsubishi eclipse have a very high rev when the engine is hot and jerk when idling or at constant speeds but accelerate smoothly?
Check the compression for the cylinders on the Eclipse. If there is?æa leak in one of the cylinders then this could cause the jerking.
Why does a 1992 Elantra rev up and down while idling?
# Vacuum leakage # Air filter clogged # Fuel pump not delivering sufficient fuel to the injectors # Leaking head gasket # Timing belt and/or pulleys worn # Camshaft lobes worn
1991 Acura Legend when cold startup the vehicle idles normal then after a few minutes the engine will rev up and down like its pulsing Any ideas?
No idea. But mine just started doing the same thing (91 Legend L automatic). I haven't started it in 1 1/2 to 2 weeks, and the same, idles normal for a few minutes, then begins reving between 1 and 2 k rpms like it's pulsing -- does the same in neutral. About to take it in on Tuesday... I would check your tps first
