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Greg A
Greg A, Master Troubleshooter
Category: Chevy
Satisfied Customers: 8783
Experience:  Working with Electronics & Cars for 25+ Years
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2001 tahoe: I adjust the idle..keeps stalling..little low

Customer Question

How do I adjust the idle on a 2001 tahoe. It keeps stalling at idle. The idle seems a little low.
Submitted: 8 years ago.
Category: Chevy
Expert:  Greg A replied 8 years ago.

Hello & Welcome,


The idle speed on your vehicle & engine is controlled by the Idle Air Control (IAC) valve, which is controlled by the Powertrain Control Module. So there is no external adjustment, like there used to be on older engines that had carburetors.


What will often cause a poor idle condition is deposits (dirt) inside the throttle body. This will cause bad air flow through the system, and especially near the IAC valve.


What I would do is give the throttle body a good cleaning with carburetor cleaner (as a start). This will remove the deposits and allow the air to flow properly through that part of the system.


I have included the following PDF file about replacing the IAC valve to show you where it is and where to look. I have also included the Idle Relearn procedure, just in case you need it. You should be able to click on the links and view these files on your computer and print them out, if needed.


Replace IAC Valve


Relearn Idle


Please let me know how it goes or if you have more questions.


Take Care, Greg A.