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2000 Ford Taurus Rough Idle.

Tiny
TRISSTON
  • MEMBER
  • 2000 FORD TAURUS
Engine Performance problem
2000 Ford Taurus 6 cyl Front Wheel Drive Automatic 67000 km

Car runs poor at idle sometimes. Seems to go away after I drive it a while and when engine is warm and the last two days the car has been fine with the temperature outside around 0'C. The engine light was on and pulled code P1504, P0402. I changed the DPFE valve and code P0402 is now gone but P1504 is still present. It seems like the cars IAC valve was changed before I got the car 15000 km ago. Is it a bad IAC, MAF dirty or a vacuum leak? Any advice is apreciated.

Thanks
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Thursday, December 3rd, 2009 AT 1:26 AM

1 Reply

Tiny
BMRFIXIT
  • MECHANIC
  • 19,053 POSTS
P1504 is an IAC circuit malfunction
Possible causes are.
IAC Circuit Open, Or Shorted To GND Or VPWR
VPWR Circuit To IAC Valve Open
Air Inlet Plugged
Damaged IAC Valve
Faulty PCM
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Thursday, December 3rd, 2009 AT 5:47 AM

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