General Ford Ranger Discussion General discussion of the Ford Ranger that does not fit in any other sub-forum.

HELP!! Reving Problem can't seem to fix.

Old 03-04-2012
Thread Starter
Join Date: Mar 2012
Location: Louisville, KY
Posts: 1
HELP!! Reving Problem can't seem to fix.

Hey everyone, I got a big problem that I cannot seem to figure out. I have a 1998 Ford Ranger 4x4 with a 3.0 V6. Here is the problem: While I am driving and I press my clutch in my motor will rev anywhere from 2000RMP-2800RPM. It will continue to hold that RMP until I come to a complete stop, in which case it will finally drop back down to idling speed. The only code that was being thrown was a EGR Valve code (which has since been replaced) This only happens when I am driving and the truck is warmed up. I cannot for the life of me figure out what is doing this. Here is a list of things I have tried so far.

New EGR Valve
EGR Solenoid and Pressure sensor
Idle Air Control motor
Throttle Position Senson
Check all Vacuum lines and found no leaks
New Mass Air flow sensor

I have heard that the speed sensor might cause this problem and have ordered one. mine is located on the rear Diff and is listed as an ABS sensor. Not sure if this is the one I need or not.
If anyone has had this happen or have any idea Please help me out ! Thanks in advance
Old 03-05-2012
97ranger xlt's Avatar
Join Date: Feb 2007
Location: Mass.
Posts: 490
so there are no codes now? did you re-set the computer?

a bad pcv valve will cause a high idle and not throw a code.
Old 03-05-2012
V8 Level II's Avatar
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Join Date: Nov 2004
Location: Michigan
Posts: 7,910
This is not likely to be a problem with the rear axle VSS/ABS sensor.

Here's a quick check that you can try. With everything plugged in normally, throttle closed, engine off, ignition on:

Measure the TPS voltage between the gray/white and gray/red wires. The voltage should ideally be about 1.0V at closed throttle. If it is significantly greater, let's say roughly 1.5V or higher, the RPM may hang until the vehicle speed drops down near zero.
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