GMC SIERRA 1500 4X4 ROUGH COLD START IN COLD WEATHER

GMC SIERRA
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BUCKNUT
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  • 1 POST
GMC SIERRA 1500 4X4 2002 130K 5.3 V8-RUNS GREAT UNTIL COLD WEATHER-@ COLD START DURING COLD WEATHER ENGINE IDLES HIGH AND SUDDENLY LOW AND ROUGH TO THE POINT IT MAY STALL-REPLACED AIR FLOW SENSOR @ EXIT OF INTAKE FILTER HOUSING-NO CHANGES-ANY EXPERIENCE WITH THIS?
Nov 21, 2007 at 11:09 PM
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BLACKOP555
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you may need a new coolant temp sensor/sending unit, they help the engine adjust a richer mixture to get the engine to warm up better.
Nov 22, 2007 at 3:17 AM
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JEFFSWANSON
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Did you ever get your problem fixed? Our 02 Yukon is experiencing the same problem. Our mechanic wants to replace the intake which is made of plastic. Warm weather idles great... Cold weather idles very rough.
Jan 3, 2008 at 8:20 AM
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BLACKOP555
  • ✓Experienced Mechanic
  • 10,386 POSTS
hello jeff! i belive the coolant temperature sensor worked or he would have posted back, have your mechanic change that first.
Jan 3, 2008 at 10:43 AM
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