98 2.5L 5sp rpm won't decrease during shifting
#1
98 2.5L 5sp rpm won't decrease during shifting
I have a 1998 Ranger with a 2.5L 5 speed tranny. My problem is while the clutch pedal is pressed in during shifting (foot off of accelerator) the engine rpms never decrease. IAC valve has been changed,no codes thrown. Any help is appreciated.
#3
This is a normal "dashpot" function of the IAC motor. The engine will retain its RPM during shifts to reduce emissions.
A dashpot is a mechanical device, a damper which resists motion via viscous friction. The resulting force is proportional to the velocity, but acts in the opposite direction, slowing the motion and absorbing energy. It is commonly used in conjunction with a spring (which acts to resist displacement).
A dashpot is a mechanical device, a damper which resists motion via viscous friction. The resulting force is proportional to the velocity, but acts in the opposite direction, slowing the motion and absorbing energy. It is commonly used in conjunction with a spring (which acts to resist displacement).
#5
If you want to determine if it's the "dashpot function" or another problem, you can disconnect your VSS sensor in your dash. Can't remember what color wire it is. But if you do it right, your speedo wont work either. The GEM won't think you are moving so the motor decreases RPM immediately. I found this out while recalibrating my speedo.
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