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GMC Sierra 1500 4X4 ROUGH COLD START IN COLD WEATHER

Tiny
BUCKNUT
  • MEMBER
  • GMC SIERRA
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?
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Thursday, November 22nd, 2007 AT 7:09 AM

3 Replies

Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
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.
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Thursday, November 22nd, 2007 AT 11:17 AM
Tiny
JEFFSWANSON
  • MEMBER
  • 2 POSTS
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.
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Thursday, January 3rd, 2008 AT 4:20 PM
Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
Hello jeff! I belive the coolant temperature sensor worked or he would have posted back, have your mechanic change that first.
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Thursday, January 3rd, 2008 AT 6:43 PM

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