Question about 2003 Ford ZX2

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Idle raises to 2500 rpm when car is very hot

When the outside temp is in the upper 80,s+ and the car has been running under load for 30-45 minutes with a.c. or not.the idle sometimes revs up to the 2,200 2,600 rpm range. it does not do it consistently.there are no codes or check engine light on when this occurs.i've changed the tps and the iac still no change.sprayed contact cleaner all around everything searching for an air leak, no fluctuation in idle.checked coolant temp with scanner and it's ok.

any ideas? a hose colapsing ? other sensor ? ?????????????????


help pete

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Check the inlet air temp sensor. It should be located near the airbox but before the throttle body. This unit does not show in code. It registors the outside air temp and adjusts throttle and fuel mixture to match. If the sensor id faulty it will show as being cold and set the throttle for cold starting and running. Check manual or Autozone for multimeter ohms check on this unit.

don

Posted on Sep 30, 2008

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