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2004 Dodge Dakota engine ocilation

Tiny
KENNETHTANKERSLEY
  • MEMBER
  • 2004 DODGE DAKOTA
  • 3.7L
  • V6
  • 4WD
  • AUTOMATIC
  • 114,000 MILES
When driving at about 40 mph or less the rpm's oscillates up and down about 500 rpm. Is this a bad sensor on the engine or does the speed in or speed out sensor on the tranny got some type of issue?
Wednesday, January 15th, 2014 AT 7:29 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,758 POSTS
It sounds like you either have an engine vacuum leak or the idle air control valve (IAC) is bad. The IAC is responsible for maintaining the engine idle speed. First, check for vacuum leak issues. If none are found, then suspect the IAC.

If the check engine light is on, have the computer scanned to identify trouble codes. Most parts stores will do it for free. That will help identify where the problem is coming from.
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Thursday, January 16th, 2014 AT 5:27 AM

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