Ruff idle

LARRY383

MEMBER
FORD F-250

I have a 1997 f250 with a 5.8 that runs ruff at idle just above 1000 RPM the missing goes away and runs just fine. And it gets poor gas mileage sence this has happen to the truck, p.S I replaced the plugs wires cap and roter button no changes. Whats next? Thanks

8 Replies

BLACKOP555

MECHANIC
10,371 POSTS

Clean the injectors and add some fuel aditive to nice fresh fuel and let it run through and see if that clears anything up. If that does not remedy I would check the TPS or IAC. The TPS may be wiggling and loose causing the pcm to send improper fuel to the engine. The IAC may be plugged cau

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Friday, October 26th, 2007 AT 4:57 PM

LARRY383

MEMBER
7 POSTS

I ran fuel cleaner in the tank did not help what is the TPS and ware is it located on the motor or what is it neer? It is fuel injected thanks for the info p.S ware is the IAC?

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Friday, October 26th, 2007 AT 5:22 PM

BLACKOP555

MECHANIC
10,371 POSTS

TPS is the throttle position sensor and the IAC is idle air control. They are both located near the throttle body. (Where the air intake hoses go to the engine)

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Saturday, October 27th, 2007 AT 8:43 AM

LARRY383

MEMBER
7 POSTS

I HAVE A 1997 FORD F 250 WITH A 351 IT WAS IDELING RUFF SO I WORKED ON IT TODAY TO TRY TO FIX, AND NOW THE TEMP GAGE DON'T WORK AND THE TRUCK DOESEN'T IDLE RUFF ANY MORE. IT PERS LIKE A KITTEN. WHAT I'M ASKING WITH THE WIRE THAT SENDS A SIGNAL TO THE GAGE, SENDS POWER TO OTHER CONTOLS THAT COULD MAKE IT MISS AT IDLE LIKE IT WAS A IDEL

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Sunday, October 28th, 2007 AT 9:23 PM

BLACKOP555

MECHANIC
10,371 POSTS

Yes, it could. The coolant temp sensor picks up on coolant temp and sends the signal to the coolant temp sending unit that sends a signal to the pcm adjusting hte fuel mixture and one to the guage.