Question about Cars & Trucks
Several things can cause rough idle on a Ford.
Check all vacuum hoses for, first of all, that they are there, and then that they have not been chewed by mice or squirrels (that happens), or rotted away (that happens too).
Check the coil pack(s) for corrosion at spark plug terminals, check plug wires--at night, the darker the better, raise hood with engine running; blue sparks or lightning jumping around the wires and plugs means your wires are dead--check plugs for fouling or tip wear, if your car has over 100,000 miles check catalytic converter and fuel filter, and check the TPS. The throttle position sensor monitors where the gas pedal is, and since most of the time, it is at the place that makes the car go 55, or idle, the TPS can get worn in those positions and send false signals to the PCM. Fords of that vintage also used a pulsed air feeder that can cause rough idle and is very difficult to service.
Best bet is vacuum leak first, then spark, then fuel, then the out-there stuff.
Posted on May 07, 2014
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Posted on Jan 02, 2017
what codes are present? If it is lean codes P0171/P0174 problem is most likely the orings leaking between upper and lower intake manifold if this is a 4.0L
Posted on Feb 11, 2009
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