2004 Buick Ranier running rough

2004 BUICK RANIER
100,000 MILES • 6 CYL • AWD • AUTOMATIC
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MRPPATTERSON
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  • 2 POSTS
wont idle & runs rough when heater is on. also speedomp. has gone haywire dont know if its related or not.
Feb 7, 2010 at 8:14 AM
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DENNYP
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  • 1,824 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.
Mar 26, 2010 at 8:25 PM