Question about 1999 Ford Explorer

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I999 ford explorer 4l engine. When in gear it idles fine, but in neutral or park it reves up and then goes low and sometimes stalls. WHAT COULD BE THE PROBLEM?

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I would check either the idle air control valve or the throttle postion sensor. Is the check engine light on?

Posted on May 09, 2010

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2003 Ford Explorer XLT Wants To Stall At Low Idle,, especially when at a stop light


How does it idle in park , does it run ruff or smooth? Are any lights lit on the dash , check engine etc. ? Could have a partially plugged IAC air passage .idle air control (IAC) valve ! The engine computer uses the IAC to control idle , when under a load such as when put into gear the computer raises the idle ! It does this by allowing more air to by pass the closed throttle into the engine raising the idle ! If these air passages clog they restrict the air flow an cause a idle problem ! Now if it runs ruff at idle in park you could have vacuum leak ! Rough Idle How to Fix Ford Taurus Engine Stalls at Stop Signs

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Stalling issue


an 03 has a gen 2 OBD that stores faults (not all faults trip the ck engine light) i would start there by doing a download (all faults)with a code ck'er , could be something as simple as an idle adjustemnt or maybe a vac line got broken/left off when doing the plugs/wire change , happens!!!

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Rough idle after engine is warm


Dirty air filter, dirty throttle body...try 2 bottles of gas line fuel injector cleaner...has your car been parked for awhile? Heet gas additive will work on any low gas tank sludge that you may have. Hope this helps.

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I have a 1993 Ford Explorer that goes into high idle when I put in gear. It does this when the engine is hot or cold.


On some cars there's a speed sensor on the clutch or transmission. That might cause an idle problem.

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My Nissan sentra fn15 with a ga15 engine, the rev counter does not change with rpm increase, drive car for 10 mins it slowly goes to 5-600 rpm, it also stalls sometimes, are they related


WHAT YEAR? CAR.
the engine tachometer reads what.
that whole post is a contradiction.
ahh, you mean the engine does not accelerate, or the engine bogs.
600 RPM is why below, 800 normal (most cars)
the engine stalls, well sure it will as low idle speed will surely do.
so the real post is my engine stalls.
and if i try WOT ,it will go above 600 rpm in or out of gear?
wot means wide open throttle.
can the engine race to 3000RPM in PARK (or neutral)
if engine power is ok, full WOT power up a hill and is only and idle problem say some. and we work bad idle.

the top reason for stalls (besides #1 never ever doing the 60k mile service,repeats at every 60k)_
is a stuck open EGR (part of same service to do that but Ill add that)
or stuck closed ISC (electric IAC)

Oct 16, 2013 | Cars & Trucks

1 Answer

98 Ford Explorer erratic cold idle / SOHC engine / idle continuously jumps from 500 - 2500 rpms when cold / is fine when warm


98 ford explorer erratic idle from cold reves jump. ok when warm but still stalls at times.

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1 Answer

Engine won't keep idle speed intermittently


check the idle control valve they sometimes get dirty

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near the throttle body there is an adjusting screw(flat head) for air fuel mixture, it's on a deep cavity sometimes with a cover, adjust counterclockwise will increase the idle.

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Engine stalls at stop lights and stop signs


sounds like the torque converter lock up might not be disengaging. You might also want to check for engine vacuum leaks. Does engine idle smoothly when in park or nuetral ? if the idle is good I would suspect torque converter problem.

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