Tuneman1984

I just noticed this issue today.

When the car is in neutral, with or without the clutch depressed, it idles normally (little bit of variation but nothing to be concerned about). When I put the car in gear (clutch depressed obviously) it revs up to about 1500 RPM. Any idea what might cause this?

I just had the car into the shop for a charging system check, any chance they goofed something?

Sterling_Six

Hello and good day:

Do you have any CEL (check engine light)???

This is a classic symptom of the VSS:

Vehicle Speed Sensor (VSS)

The Vehicle Speed Sensor (VSS) is a small signal generator that is turned by a gear inside the transmission assembly. The Vehicle Speed Sensor produces 8 pulse per rotation which a stock computer assumes 8000 pulses per mile. The Vehicle Speed Sensor (VSS) is a variable reluctance sensor that generates a waveform with a frequency that is proportional to vehicle road speed. When the vehicle is moving slowly, the sensor produces a low frequency signal. As the vehicle speed increases, the sensor produces a higher frequency signal The Vehicle Speed Sensor (VSS) supplies this signal to the components that require vehicle speed information including the speed control amplifier for cruise control equipped vehicles and computer. The computer uses the VSS signal for emissions control programs and speed limiters. The emissions programing can cause a manual transmission vehicle to stall out while decelerating

__________________
Good Luck and good repairing Sterling_6
"You know, just like in that Book, When Jesus beats up Moses to get Religion!!"

FordMan59

I doubt that your '89 has a VSS. I think that was before any of the Escorts had electronic speed sensors. I'm not very familiar with the GT, but my guess would be the throttle position sensor or which ever it has the idle speed control motor or idle air control valve. I have also seen a bad ECU cause idle speed problems.

Tuneman1984

Thanks for the replies. I've read about Idle Air Control Valve issues on Escorts so it might be that. Just strrange that it started yesterday suddenly. It's not a big issue since it's not revving that high, but I'll keep an eye on it.

Sterling_Six

OMG you are Right "Ford", and Me Stuck on Stupid...LOL Its a Manual Tranny also...Forgive me.

The TPS, or MAS may then be the Little Bugger....

__________________
Good Luck and good repairing Sterling_6
"You know, just like in that Book, When Jesus beats up Moses to get Religion!!"

FordMan59

Don't feel bad we all have those absent minded times. It just seems that mine last longer than most peoples!!! I wasn't sure about the GT and the VSS, but I knew my '88 Pony was a cable driven speedometer.