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2000 ford explorer high idle problem


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pinhead_862002
New User

Jul 24, 2006, 6:56 AM

Post #1 of 3 (10395 views)
2000 ford explorer high idle problem Sign In

i own a 2000 ford explorer with a 4 liter sohc since spring it has started idling high between 600 to 1500 rpms i have replaced the maf sensor, throttle positioning sensor, and the iac valve. none fixed the problem. i get no check engine light i had it at the dealer and they told me to give the iac valve 2 weeks to relearn itself well its been a month and still no change. i am completely stumped i took the whole intake apart cleaned it and checked the seals all of them are good no vaccume leaks or bad hoses. it will do it every time it warms up but it will also do it when it gets warm out. the only thing i was concerned about was the bosch duel platinum plugs i put in because i found one that worked itself loose last night. i am putting in stock plugs and wires tonight to see if it helps. if anyone has any ideas to what else it could be i am desperate to get it fixed it shifts hard when traveling at low speeds. i also replaced the fuel fitler and air filter. when i purchased the vehicle 7 months ago
jonatha


pinhead_862002
New User

Jul 24, 2006, 8:35 AM

Post #2 of 3 (10384 views)
Re: 2000 ford explorer high idle problem Sign In

i went back to the dealer and they told me what ever controls the iac is what is causing the truck to idle high. anyone know what controls the iac valve
jonatha


way2old
Veteran / Moderator
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Jul 24, 2006, 10:06 AM

Post #3 of 3 (10380 views)
Re: 2000 ford explorer high idle problem Sign In

What controls the IAC is the coolant temperature sensor, load on engine(a/c on or off), or the PCM. I would look to the coolant temperature sensor first, then check to be sure the a/c relay is not hanging on making the PCM think a/c is always on giving a high idle. Lastly is the PCM. I have not replaced all that many Ford computers in the years I have worked on them. They seem pretty reliable.



Being way2old is why I need help from younger minds






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