rpm problem

2004 CHRYSLER PACIFICA
128,500 MILES
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SWEETDEE
  • MEMBER
  • 3 POSTS
When i start the car, why does the RPM jump up & down?
May 17, 2012 at 10:02 PM
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SWEETDEE
  • MEMBER
  • 3 POSTS
Thanks, for your input.
May 17, 2012 at 10:03 PM
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FIXITMR
  • ✓Experienced Mechanic
  • 9,990 POSTS
does it go away?any warning lights on.
May 17, 2012 at 10:26 PM
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FIXITMR
  • ✓Experienced Mechanic
  • 9,990 POSTS
it likely happens cause it's running too lean. this raises rpms, then computer tries to lower it. cycle continues. may have vacuum leak or wrong input signals to computer fuel mix from TEMP or MAF sensor.
May 17, 2012 at 10:29 PM
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CADIEMAN
  • ✓Experienced Mechanic
  • 3,544 POSTS
u will have to have the tps replaced
May 17, 2012 at 11:25 PM
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SWEETDEE
  • MEMBER
  • 3 POSTS
No warning lights on...it only does it when the engine is cold.
May 18, 2012 at 12:21 AM
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CADIEMAN
  • ✓Experienced Mechanic
  • 3,544 POSTS
U STILL NEED THE CODES READ BEFORE WE CAN HELP U.MOST PARTS STORES DO IT FOR FREE ty for using 2carpros.
May 18, 2012 at 11:29 AM
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