2001 GMC Sierra Warm Start Cranking

GMC SIERRA
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KGROAH
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  • 1 POST
I have a 2001 Gmc Sierra 4.3 Truck
When It is very cold out , It starts right up.
But when it is warmer out It takes a bit more cranking over to start.
Is there a tempature sensor that could be going bad???
Thanks Kelly
Mar 1, 2007 at 9:54 AM
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CHEVY22
  • ✓Experienced Mechanic
  • 1,375 POSTS
no no temp sensor like ambient air from outside except the intake air temp sensor but if it malfunctioned you would see a check engine light coming on , if you have no light it might be time for simple maintenance, plugs cap rotor wires , fuel filter air filter and induction cleaning , if these items havent been done for 30k or so its time , let us know
thanks
jim

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Mar 1, 2007 at 11:03 AM

Suggested Repair

If there is no check engine light, an intake air temperature sensor fault is unlikely. Perform overdue maintenance: spark plugs, distributor cap and rotor, plug wires, fuel filter, air filter, and induction cleaning if not done in about 30,000 miles.

Conversation Summary

The owner of a 2001 GMC Sierra 4.3 says it starts immediately in very cold weather but needs extra cranking when warmer, and asks whether a temperature sensor is failing. The expert says the only related sensor is the intake air temperature sensor, which should trigger a check engine light if faulty. With no light, they recommend routine ignition, fuel, and air-system maintenance if it has not been done recently.

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