Question about 1997 Ford Aerostar Extended

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Not idling smoothly, sometimes having to restart at a stop w/ tranny in drive.

This problem just popped up out of the blue. It seems to have happened when I parked the car at a store, came out to restart and the problem was
there. I turned the ignition off and on again and prob. went away for a while.
Then one day, about two weeks later, went to start car and would not idle
smooth. Real rough. With a tap on the accelerator pedal it would smooth
out and idle high, then gradually come down to rough idle again. I did find
out though that the problem diminishes when the engine warms up. Could
this be a TPS (throttle position sensor) problem?

Posted by on

  • v_hock Jul 17, 2008

    my problem is exactly the same, looking for a solution.

  • rebelclause Oct 26, 2008

    I have a Ford Diagnostics printout. I have simular problems, but can add that my tranny is hunting for gears/overdrive at highway speeds due to the rough running? The primary cause is pointing to fuel pressure, I still have yet to find the valve to check the pressure. It is either the pump, the filter or a crimped line. The if the symtoms continue it is off the emmission circuits.

    I wish I could find the blasted pressue valve!!



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  • 24 Answers

Sure, that could be it. I would also suspect the fuel filter as well.

Posted on Jul 17, 2008


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