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Rough idle 2000 Ford Taurus

Tiny
FUSION1
  • MEMBER
  • 2000 FORD F-150
I am noticing a rough idle where the enging will race to 1500rpms from start up and then jump down to 700-800 and it will be stumbling really rough. I found codes P407 P401 and have since changed the EGR, DPFE sensor, cleaned the MAF, IAC, changed ther plugs, cleaned the throttle plate, changed the PCV, so I am thinking it may be a vacuum leak but where? I don't see and cracked hoses. When the car idles high the engine runs smooth, once it starts idling 700-800 rpms and stumbling I hear the hissing sound around the EGR area that I never recall hearing before. The funny thing is the hisdsing sound disappears when the car is reving at higher RPMs.
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Sunday, December 10th, 2006 AT 5:25 PM

1 Reply

Tiny
FUSION1
  • MEMBER
  • 2 POSTS
Forgot to mention the car just turned 90000 miles. Problem seemed to start right around 87-88k miles right after I changed the oil and added lucas oil and did a Sea Foam treatment through the brake booster /vacuum. I didn't notice the stumbling right away, but it seemed coincidental right after I added Lucas gas treatment to the tank.

I checked the OBDII code reader and no new codes and the old ones havent re-appeared but the idle hasn't gotten any better.
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Sunday, December 10th, 2006 AT 5:36 PM

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