1994 Ford Explorer car idle go's up and down on it's own

Tiny
MICHELLE STAPLES
  • MEMBER
  • 1994 FORD EXPLORER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 100,000 MILES
We own a 1994 ford explorer eddie baurer and just recently replaced the IAC valve and EEC relay. Our car has had no starting issues since we replaced the EEC relay, but now it is idiling irratically. It seems like it wants to take off on it's own, even with the foot on the brake padel? The idle reves up and down, any suggestions? We have replaced the fuel filter and fuel pump a year ago.
Saturday, October 4th, 2008 AT 4:17 PM

1 Reply

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
You may have a vacuum leak, get a can of spray gumout, spray the vac lines and maniflod area, when the idle changes, youve found the leak! You want the engine running and spray on the outside but do direct the stream onto the hoses, if it is a vacuum leak, the engine idle will change speed, then you have detected a leak, repair the vacuum leak and see how it runs! Check also fo unmetered air from the air intake plenum betwwen the air filter box, all the way up to the throttle.
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Saturday, October 4th, 2008 AT 4:58 PM

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