Ford Aerostar
Honda Prelude
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Cause of surging idle on 97 ford aerostar?

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2005-11-20 10:27:31
2005-11-20 10:27:31

From experience I'll tell you,,,Take it to the dealer and have it scanned! It can be anything from bad wire connectors or bad wires to one or more sensors out of range. Unless you're rich with a lot of idle time on your hands, get it to a FORD dealer.

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Related Questions


It is important to know the causes of problems in a vehicle. A surging idle can be cause by a bad o2 sensor, bad fuel pump, or a computer starting to go bad.

my 2002 was doing it, they told me it was supposed to do that. morons.

No a bad egr will cause surging at idle or bucking while under light acceleration.

Your 1994 Honda Civic will overheat when the thermostat is malfunctioning. The overheated engine can experience the idle to surge. The engine should be turned off immediately.

a vacuum leak can cause high idle

Check: 1.- PCV vacum hoses 2.- Engine oil cap looseness. 3.- rocker cover gasket

sounds like it could be the timing when it's under a load.

The most common cause of a 1996 Ford Escort to idle rough is bad spark plugs or bad spark plug wires. A plugged air filter will also cause it to idle rough.

How do you know it is surging? The most common cause for a jump in idle speed while the AC is running is when the cooling fan cycles on and puts a draw on the alternator.

The most common cause of engine surging (rev up and down) is a dirty air filter.

There is a vacuum leak in the engine. When there is not enough pressure in the air system the car will not idle correctly. This can cause a slow idle, erratic idle, or even a surging idle. Check the vacuum lines and intake for any leaks.

Separation of the ethanol due to water in the gasoline.

Vacuum leak or IAC (idle air control) valve stuck/sticking.

If it has an idler control valve, and most do, I'd go with that.

chances your spark plug wires in wrong order happenned to me on my 92 i was given different firing orders be specific with whomever if its distributor or coil pack

Any of factors can effect your idle. Things you can have checked or check yourself, if you feel brave enough are: vacuum leaks, fuel system, egr, pcv, air filter, could be your fuel is not putting out sufficient fuel, head gasket (to my experience, usually not the cause if car properly maintained). Usually this is caused by the fuel system not operating properly.

first it will cause the car to idle and run rough.It also can cause the check engine to stay on.

first you will need to determine if it is surging due to a fuel issue or governor issue. to do this hold the throttle linkage at the carb from moving. slightly higher than at idle. if it stops surging then it is the governor that needs to be reset. if it continues to surge then you have a fuel issue

there is a few things it could be, it could be a dirty injector, a bad lift pump, the pump has to have over 12 psi at idle or you injector pump might be going out they usually run $1250. those could be your posibilities.

Im not sure about a 92, but when it happened to my 98, i had to replace the Idle control valve. its generally about 50 bucks and is very easily done.

simply put you can't if it is idleing not normal their is a problem surging/hunting idle=fuel pump/filter high idle =vacuum leak or sometimes fuel pump

I ASSUME it would be the same as the 4.0 liter in my 1995 Ford EXPLORER ; ( 39 / 40 PSI , key on , engine off , and 30 PSI with engine running at idle )


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