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2002 Dodge Ram Incorrect idle

Tiny
JAMUSICBOX
  • MEMBER
  • 2002 DODGE RAM
  • V8
  • 2WD
  • AUTOMATIC
  • 106,000 MILES
When I start my truck, the engine races up to about 2000-2200 rpm and then settles down to about 1000 rpm. When idling, it will fluctuate from the normal 700-800 rpm up to 1200-1500 rpm. When I am driving, the rpm will fluctuate 200-300 rpm almost constantly. When I slow down, you can feel the transmission down shifting kind of hard.

I have ran two bottles of fuel injector cleaner through the fuel tank and I have no check engine light.

Any help would be appreciated. Jeff
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Saturday, May 30th, 2009 AT 4:52 PM

3 Replies

Tiny
CARADIODOC
  • MECHANIC
  • 33,741 POSTS
Kind of sounds like a vacuum leak. Try pinching off various vacuum hoses. You can also use a squirt bottle to spray water around hoses and gaskets. The rpm will drop when water momentarily blocks the leak.

Caradiodoc
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Friday, June 5th, 2009 AT 2:49 AM
Tiny
GHUNEY
  • MEMBER
  • 2 POSTS
I also have a 2002 Dodge Ram with 105K that is doing the exact same thing your 2002 is doing. If you have any luck on curring the problem please pass it on and I will do likewise.
Thanks Gregg
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Thursday, August 6th, 2009 AT 12:26 PM
Tiny
GHUNEY
  • MEMBER
  • 2 POSTS
I just replaced the IAC valve. Still doing the same thing.
Gregg
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Tuesday, August 18th, 2009 AT 11:52 AM

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