1886fc car revs up and down on its own
 

hey guys jus got my fc running...bought it from a guy that sat it for 12yrs... it running good starts right up... but the thing revs up and down, even after warmin gup and @ operatting temp it still does it... any way i can test too see exactly whats doin it or what??? thanx :icon_tup:

You have a sensor on the front of the throttle body called the TPS. It has three wires. One of theses wires is Green/Red. W/the car fully warmed up (20 -30 minutes of driving time) and key to on the Green/Red wire needs to read 1 volt. The throttle linkage that rests up against the sensor's plunger has a screw encased in a spring measuring about an inch in length. This is the adjustment screw to dial in the 1 volt reading.

ok kool thanx you...ima try it today

this part i dont under stand i thing u left a part out?? you:(One of theses wires is Green/Red. W/the car fully warmed up (20 -30 minutes of driving time) and key to on the Green/Red wire needs to read 1 volt.)

The TPS has three wires. One of them is Green/Red. After the engine is fully warmed you measure the voltage on the G/R wire w/key to on. It needs to read 1 volt.

ok brotha thanx.. now u mentioned that i can adjust the tps with that screw thats on there?? will adjusting and cleaning it fix the problem if the sensor is ok

The screw incased in a one inch spring is for the TPS adjustment. Your problem is either manifested by an improperly TPS or a vacuum leak. Which is it? I don't know as you'll have to find this out yourself.

ok sweet!! ima take alook @ it right now...ill get back to u after let you know what i found and fixed

sure it only sat for 12 years? it is 125 years old now.

1886 fool