2004 Buick Ranier running rough

Tiny
MRPPATTERSON
  • MEMBER
  • 2004 BUICK RANIER
  • 6 CYL
  • AWD
  • AUTOMATIC
  • 100,000 MILES
Wont idle & runs rough when heater is on. Also speedomp. Has gone haywire dont know if its related or not.
Sunday, February 7th, 2010 AT 8:14 AM

1 Reply

Tiny
DENNYP
  • MECHANIC
  • 1,823 POSTS
The speedo problem is most likley a bad instrument cluster. As for the rough idle, the heater should not affect on the idle quality. If it is in defrost mode, the A/C compressor will cycle. This will have an effect on idle quality.
The first thing to do is have it scanned for trouble codes. Use a scan tool to see if there are any cylinders misfiring.
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Friday, March 26th, 2010 AT 8:25 PM

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