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Matt, Mechanical Engineer
Category: Car
Satisfied Customers: 22467
Experience:  BEng hons Mech engineering, in auto industry 22 years
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My 1998 4.0ltr range rover auto runs at 3000rpm from cold then

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My 1998 4.0ltr range rover auto runs at 3000rpm from cold then drops down to1500rpm and wil not lower to(###) ###-####changed idle switch, plenim switch ,plugs,leads,checked vacum hose for leaks,plenim cover for leaks,nothing.THE only time it will drop rpm is when you unplug the air intake plug after air filer
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Customer: replied 1 year ago.
Hello if you haven't already then I'd check the wiring and connector to the airflow meter for any signs of corrosion or damage. you can do a quick fault find if you unplug the meter and run the engine without it.if the engine condition is the same then chances are the meter or the connection to it is faultyAir leaks are very temperature dependent as gaps can open or close up as things expand with heat, so the weather and engine temperature can effect them.This leads them to be quite intermittent in the case of mild leaks its also worth cleaning the airflow meter by removing it from the car and spraying the exposed sensor wires inside the tube with a brake or switch cleaner - ensure that the cleaner is one of the old fashioned, non Eco type that does not leave a residueOn no account touch the sensor wires with anything physical as they are extremely fragile and lastly remove the air intake hose and wipe out the throttle body and check its closing off fully as it should 'snap' shut if all of this is OK then it I'd try adjusting the closed position of the throttle
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Matt, Mechanical Engineer
Category: Car
Satisfied Customers: 22467
Experience: BEng hons Mech engineering, in auto industry 22 years
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