Question about 1999 Ford Explorer

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99 explorer 4.0l(pushrod)idles at 1500 at start up then drops to 1100

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  • laurendeau3 Nov 27, 2009

    I understand that. However this also happens at temp, and often when stopped!



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At start the computer idles the car quicker until it gets a signal that the motor is warming up at which time it cuts the idle speed. this is perfectly normal.

Posted on Nov 27, 2009


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I have a 99 gmc jimmy Ive notice while i slow down for a turn my car is still trying to accelerate and only when I come to a full stop it goes back to normal Also when first starting the car it revs up to...

Vacuum leak from brake booster. If you hear a sucking noise when you press the brake pedal replace it. Another way to check it is to place truck in gear set e-brake press brake pedal repeatedly and see if idle goes up and down. DO NOT PRESS GAS PEDAL DURING TEST.

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I have a 96 ford explorer v6 with a pushrod motor and after we replaced the pushrods, the head gaskets, the valve cover gaskets and the fuses, the car will not idle. what could be the problem?

Have you adjusted the pushrods properly? Pushrods generally need to be adjusted after installation.

Not sure how to do this on this model, although I own a 94 Ford Explorer with the V6 4.0 Liter motor.

Basically, when a gas engine doesn't run, you check 4 things, and narrow it down from there.

1. Gas (Is gas pressure good, is gas flow strong enough?)
2. Spark (are all spark plugs firing properly? Is spark strong enough)
3. Combustion at each cylinder (timing, pushrod adjustment)
4. Air Flow (MAF/MAP sensor working? Air Filter dirty?)

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Occassionally when I start my 99 Ford Explorer it'll die when I take foot off accelerator. I was told that I need to replace IAC motor. Any advice? Does this sound like typical "symptom" for IAC...

It could. Be sure to clean the throttle body first. Open it wide open and take an old toothbrush and carb cleaner and make sure its clean. Usually when the IAC is bad, when you firsty start the truck the idle speed will "flare" to like 12-1500 rpm, then settle down to 7-800. If it doesnt do that, then it could be bad.

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hate to say it but this model is known for fuel pump issues. I had a '99 4X4 and had similar problems, replaced the fuel pump and all was good. If you do this job yourself I recommend pulling the bed off over dropping the tank. Though the whole repair is a pain in the *** this actually the easiest.

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