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Fluctuating RPMs

Tiny
TOMMY THOMAS
  • MEMBER
  • 2007 CHRYSLER TOWN AND COUNTRY
  • 3.0L
  • V6
  • 2WD
  • AUTOMATIC
  • 70,000 MILES
When the motor is in idle, transmission in park, and the motor cold, is the motor suppose to speed up and slow down, back and forth, when gas is applied? When motor warms up it stops. Is this normal?
Saturday, February 24th, 2018 AT 8:33 AM

3 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning

No, it is not normal at all. It should stay nice and smooth.

Is the check engine light on?

When was it last serviced?

Roy
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Saturday, February 24th, 2018 AT 8:51 AM
Tiny
TOMMY THOMAS
  • MEMBER
  • 2 POSTS
Yes, the engine light is on. I put my code reader on it, and it indicated a low vacuum leak. Could this be the cause? Could that be it or could I just need a fuel cap replacement?
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Saturday, February 24th, 2018 AT 9:39 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
What is the code number?

A vacuum leak will definitely cause this issue.

Roy
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Saturday, February 24th, 2018 AT 9:41 AM

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