Hi,The car that I have is a 1991 ford falcon eb auto sedan and this is the first car with an onboard computer that I have owned and I have some knowledge how to repair cars.Bought this car 4 weeks ago.The problem that I have is that the car has a tendency to keep on running on,by this I mean that that it feels like the chock is stuck and the engine is running too cold.i went to a ford dealer to get a genuine water thermostat for normal running temperature and asked him about this wired sensor that sits under the carby with wires coming from it.i said that if I push the pin down (looks like some type of plunger)on it the high idle will drop down to normal.The engine doesn’t drop revs until the car stops moving.The dealer said that this is an adjustment to do with running at 7 or 9 volts and is quite easy to adjust at the carby cam adjustment.could some one explain this adjustment procedure for me.i do not have any meters to take any readings for this.maybe trial and error.
By carby I assume you mean 'throttle body' and the thing with the wires is the ISC.
Did you perform a self test on the computer?
If so what error codes were returned?
I had the same problem, and the reason was the faulty power steering pressure switch. It generated a signal as if power steering was activated, which required some extra fuel. The car was going up to 60 km/h at idle speed. The idle rpm returned to normal only at full car stop.
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