How do I adjust the valve on a 2002 GMC Denali 6.0

Question edited for clarity.
Question moved to model category.

Here are all your fuses

GMC Envoy (2002-2009) fuses and relays

https://fuse-box.info > gmc > gmc-envoy-2002-2009-f...

Here you will find fuse box diagrams of GMC Envoy 2002, 2003, 2004, 2005, 2006, 2007, 2008 and 2009, get information about the location of the fuse panels ...

Here's a video on how to replace your valve. 2008 GMC Yukon Denali 6 2L purge valve solenoid replacement Code P0449

-Open valve cover and check it out. It's bend or out of adjustment. If it's bend then has to replace the valve
that make noise. If it's out of adjust or gap is too wide
then just adjust to the correct gap. you should be good to go.


Good Luck


Mai

should be mounted on the side of the throttle body

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Regards, Tony

it has hydraulic lifters ther is no adjustment

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There is no such thing as a "cold start valve" but there is an IAC motor that adjusts the idle speed, and they can fail/stick and not turn on the check enging light. There are a couple of things that can cause what you are describing so I wouldn't just start throwing parts at it. You really need to have a shop with a scan tool have a look at it.

most likely a bad idle air control valve. Its only purpose to to adjust the idle for loads like the AC and turning the power steering..

THERE IS A PURGE VALVE ON TOP FRONT OF INTAKE AND A VENT VALVE IN REAR ON DRIVER SIDE NEAR GAS TANK.GM HAS A UPDATED REPLACEMENT VENT VALVE WITH HOSES FOR $300. PURGE AND VENT VALVE WORK TOGETHER TO VENT FUEL VAPORS FROM GAS TANK.

it has gone bad replace it