High Idle

[thewest]

I have a '98 Ranger v6 3.0 4x4. I've had it for about a month. Since I purchased it I have had poor gas milage (13mpg) and a high neutral idle. When moving and engaging the clutch (neutral) the idle hangs around 2100-2200rpm, when the truck is at rest and I rev it up in neutral and release the gas it drops to 700-900 like it should. I have relpaced the AIC and the DPFE sensor, I've tested the EGR solenoid, EGR valve and every vacuum line i can find associated, they work great. All my electrical connections are in pristene shape as well not a bit of corrosion. I've also cleaned the pcv valve.

Alright, so get this, if I hop in the truck to drive it around the block, stop half-way, and unplug the brand new AIC the truck runs perfectly!! I can't help but feel that by leaving it that way I'm trading one problem for another especially when the weather gets colder.

So there is 1 of 2 problems I can think of:
Something is causing one of the sensors to read wrong
or
One of the sensors that reports to the computer that directly effects the state of the AIC needs replaced


Anybody know exactly which sensors effect the AIC? I would replace the temperature sensor but I don't think that would explain why it doesn't have the problem when at a complete stop.

 

[J_Davis]

I dunno if this is right but how about the throttle position sensor, my dad's 98 3.0 keeps the revs high when you press in the clutch to shift???

 

[Stxrangerbumper]

clean iat sensor maf sensor and iac whit the cleaner

check in autoparts store
I unplug my mass air flow, my problem has disappeared I have been victim to this kind of problem was. and / or lubricate the throttle cable