98 Ranger 3.0 Engine high RPM's when warm
 

When my 3.0 Liter 98 Ranger warms up I have an intermittent problem with high RPM"S - I'll pull up to stop or be in traffic and the engine goes to about 3000-3300 RPMS' - sometimes I can get it to slow by feathering the clutch a few times and then it will drop back to idle in nuetral or with the clutch in - but this is hit or miss? I suspect some sort of sensor - help please!

RE: 98 Ranger 3.0 Engine high RPM's when warm
 

Was the battery disconnected recently?

RE: 98 Ranger 3.0 Engine high RPM's when warm
 

sounds like iac valve (idle air control sticking)

RE: 98 Ranger 3.0 Engine high RPM's when warm
 

i have a 97 that did the same thing for sometime all i did was hit the gas pedal very hard and it quit doing it.

RE: 98 Ranger 3.0 Engine high RPM's when warm
 

Yes - I had a new starter put in so the battery was disconnected - but it was doing this even before - what's your thought?

RE: 98 Ranger 3.0 Engine high RPM's when warm
 

i'm with hockey, check the IAC valve and also the TPS (throttle positioning sensor) to make sure they are operating within spec volts.

RE: 98 Ranger 3.0 Engine high RPM's when warm
 

yeppers if I had to bet money I say IAC, take the 2 blots off unplug the wire get you some carb. cleaner , and down inside the holes get filled with blowby jest keep rinsing it out till its clean , an carefully see if the plunger will move up an down. If i remember rite it has a one inch stroke that provides the computer with over 230 diff settings !!!!,, I have seen them so clogged up the the holes in the throttle plate where closed off,, they are basicly a metered vaccum leak