Cold crank car has a rough idle

Tiny
ANONYMOUS
  • MEMBER
  • 2003 INFINITI I35
  • 180,000 MILES
Cold crank car has a rough idle. The car doesn't have its smooth idle in the morning anymore. Taken to shop, but they seem to can't find the problem.
Wednesday, October 17th, 2012 AT 5:01 PM

1 Reply

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
If the cold start rpm is low it could be due to various reasons.
Do you have coolant losses or overheating issues?
Are there any trouble codes?
After warming up, what is the idling speed and does it change when A/C is turned on?
Are there any performance and driveability issues?

Try cleaning the IAC and throttle body for a start.
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Wednesday, October 17th, 2012 AT 10:00 PM

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