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idle too low and sputters when a/c is on


goheelsbaby
07-23-2009, 09:50 AM
02 sierra when sitting at a light or just stopped anywhere the idle is sitting at 500 and if the ac is on the engine will sputter. If i touch the gas and raise the idle to 750-1000 it runs fine and no sputter...so my question is can i/and how do i adjust the idle on this truck??? or if you have had a similar problem help me out, thanks

wheelman1917
07-23-2009, 10:20 AM
You need a scanner that will recieve live data to see if the computer is getting a.c. on input. You may need an a.c. pressure switch.

goheelsbaby
07-23-2009, 11:08 AM
so you dont think it is an idle issue?? where would i get said scanner? would auto zone have one???

wheelman1917
07-23-2009, 11:23 AM
Any auto shop schould have one . Call autozone to see if their scanner does live data .

wheelman1917
07-23-2009, 11:29 AM
There are several inputs for the computer to raise the idle. When your are stopped and turn the wheel back & forth the computer recieve a signal from a power steering pressure switch to up idle.Same thing with the power demand from the a.c. compressor.

2000CAYukon
07-23-2009, 08:13 PM
It would also be a good idea to clean the throttle body since a dirty one can affect idle quality.

//2000CAYukon

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