2001 Gmc Seirra Wont Idle.

[david93073]

Hopefully you guys can help me. I gotta 2001 GMC Seirra, 5.3L, 4wd, w/ 75,000 miles. The problem is the truck wont idle once it goes into close loop. When you start it itll idle fine, drive fine, all is well but as soon as it warms up(goes into close loop) it wont idle. You can keep your foot on the gas pedal to keep the engine running but it wont idle on its own. So far Ive cleaned the IAC and MAF(its free to do), replaced both O2 sensors(pre-cat). No change in the way the truck runs. I plan on verifing fuel pressure, changing fuel filter, and cleaning throttle body(more maintenance than anything else). Ive heard their is a TSB for this very reason that involves changing the min air rate! Anybody have any thoughts, any advice would be helpfull!

 

Thank you; David.

[2000DV4.8]

Any idiot lights on?

[david93073]

Any idiot lights on?

 

 

No idiot lights, no codes!!

[david93073]

Any idiot lights on?

 

 

No idiot lights, no codes!!

 

 

 

Problem solved! EGR valve was sticking open. A little oven cleaner and viola!!! no more stalling.....See how this works. Thanks for the help guys!!