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2000 Tahoe 5.3 stalls at idle w/ A/C on


ChevyPuttPutt

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My 2000 Tahoe, 5.3 Vortec, idle drops with A/C on. Sometimes it will drop to 300-400 RPM, and even go dead. Idles fine with A/C off, and otherwise runs great. Vehicle has about 85K miles. My question is this: What controls the idle step-up when A/C compressor comes on? Is it the idle motor on the side of the throttle body? Can it be adjusted, or does something need to be replaced?

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First thing I would do is clean the throttle plate. Take the duct off the throttle body and clean it out with carb cleaner or throttle body cleaner. Common problem.

 

 

 

 

ChevyTech007,

 

Just wanted to follow up and to thank you for the good advice. Our local dealership charged me 90.00 to diagnose and told me that I needed an M.A.F Sensor and an idle motor. Parts and labor around 850.00. Hey, this would make a good MasterCard commercial:

 

Misdiagnosis, potential parts and labor - $850.00

Can of carb cleaner and some good advice from a good guy - $3.00

Being able to fix it yourself and NOT be shafted by the dealer - PRICELESS!

 

Thanks again,

 

Mike

 

 

 

 

 

 

Sounds like the dealer was trying to rip you off and not a misdiagnosis.

 

Yep, Cleaning the Throttle body on my '01 yukon fixed my low idle when the A/C was turned on. The A/C would cut in and out and not cool at such a low idle. Hard to believe how much gunk builds up on the throttle blade.

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First thing I would do is clean the throttle plate. Take the duct off the throttle body and clean it out with carb cleaner or throttle body cleaner. Common problem.

 

 

 

ChevyTech,

 

Thanks for the info, I'll try that and let you know. I just thought that since it only did it when the compressor engaged, it might be something more sinister.

 

Thanks again,

 

Mike

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First thing I would do is clean the throttle plate. Take the duct off the throttle body and clean it out with carb cleaner or throttle body cleaner. Common problem.

 

 

 

 

ChevyTech007,

 

Just wanted to follow up and to thank you for the good advice. Our local dealership charged me 90.00 to diagnose and told me that I needed an M.A.F Sensor and an idle motor. Parts and labor around 850.00. Hey, this would make a good MasterCard commercial:

 

Misdiagnosis, potential parts and labor - $850.00

Can of carb cleaner and some good advice from a good guy - $3.00

Being able to fix it yourself and NOT be shafted by the dealer - PRICELESS!

 

Thanks again,

 

Mike

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First thing I would do is clean the throttle plate. Take the duct off the throttle body and clean it out with carb cleaner or throttle body cleaner. Common problem.

 

 

 

 

ChevyTech007,

 

Just wanted to follow up and to thank you for the good advice. Our local dealership charged me 90.00 to diagnose and told me that I needed an M.A.F Sensor and an idle motor. Parts and labor around 850.00. Hey, this would make a good MasterCard commercial:

 

Misdiagnosis, potential parts and labor - $850.00

Can of carb cleaner and some good advice from a good guy - $3.00

Being able to fix it yourself and NOT be shafted by the dealer - PRICELESS!

 

Thanks again,

 

Mike

 

 

 

 

 

 

Sounds like the dealer was trying to rip you off and not a misdiagnosis.

 

Yep, Cleaning the Throttle body on my '01 yukon fixed my low idle when the A/C was turned on. The A/C would cut in and out and not cool at such a low idle. Hard to believe how much gunk builds up on the throttle blade.

 

 

 

 

 

Yeah, thats a pretty common problem, and its cross platform.. I had a 05 Escape that couldnt idle in drive (automatic).

 

Good ol can of gumout, 2 rags later, runs like a champ again.

 

I would take that diagnosis to the service manager, by the way... People wanting to charge that much for something is obscene. And, if the service manager doenst care? Then a nice letter to the owner of the dealership, cc: all the makes he carries, and the better business bureau..

 

-Gonz

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