Regarding the RPM's like you mentioned only has 3 culprits.
1. Ford has been known to have a very faulty TPS sensors ( Throttle Position sensor) you might wanna replace it, it's very simple and msrp should be from $10-$15
2. if equiped you might also have a faulty MAF air sensor, have this checked out.
3. least likely but in the intake hose/tube you might have a Vacum leak. check all of the lines and make sure they are snug and very tight.
i hope i helped.
SOURCE: IAC control valve. Locato\ion 2002 ford escape
If it's not idling and has problems starting, it's probably the IAC motor. It's located on the throttle body. Follow the airfilter box all the way to the engine, where the rubber flex hose attaches. The throttle body should be the first aluminum part you come to. Attached to the side you'll find small little aluminum part with a small wire harness attached. Unplug it, take the IAC motor off and clean inside with carb cleaner. This should fix the problem with the idle.
SOURCE: here is the problem when i start my car 1999 vw
I researched this & you need to replace the throttle body gasket & get the throttle body re-calibrated. Seems to be dealer only. Also, the t.p.s. (throttle position sensor) could be bad.
SOURCE: whats firing order diagram of 2002 ford escape v6
Ford V6's - rear bank of cylinders are 1 - 2 - 3. Front bank are 4 - 5 - 6 starting from passenger side (front) of engine.
Your firing order is
1 - 4 - 2 - 5 - 3 - 6
You're welcome.
SOURCE: 2002 Ford Escape V6 XLT, problem w/ initial start in cold weather
Does the engine crank but just not start? Or... are you cycling the ignition switch without trying to crank the engine? Based on the information you have given, I would first guess that the fuel pump may be going out. I say this because when you first turn the key on the pump primes the engine with pressurized fuel. If the pump is getting old, it may take a few power cycles to get it going. You can test this theory by having somebody listen near the rear of the car while you turn the key on for the first time. The fuel pump make a faint, yet distinctive high pitch noise that can be heard when you turn the key on. Try that first. Next thing you would try is checking the relays for proper function... starting with the fuel pump relay. Good luck.
SOURCE: FORD WINDSTAR 3.8 V6 ENGINE IDLE ROUGH UP AND DOWN WHEN STANDING
Idle air control valve is the problem. "idle motor" tap it with a hammer it should temporarily solve your problem. it is right on top by the throttle body.
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