Thanks so much for you guys help in advance.
There are only 2 vacuum hoses on that engine Sean. One from the intake to the vacuum brake booster, One to the fuel pressure regulator. pull the small hose off of the fuel press regulator and see if gas/fuel is present. if so, replace or have the regulator replaced. typically, I find problems with the EGR tube being rotted and sucking air. this causes a lean code usually. you can spray the EGR tube to check it by spraying choke cleaner into the silver portion of the sleeve around it. if you notice the idle smooths out or picks up, you need to replace the egr pipe which includes both pipes being from the right side exhaust manifold to the intake with the egr pedestal attached to them. good luck, keep me posted on your progress
SOURCE: location of fuse box/panel for 2004 yukon denali xl
There are 2 fuse panels in the Denali.
One is a panel on the drivers side, its on the dash but facing the door.
The ohter is under the dash and above the pedals, this one is much tougher to access.
Your Owner's Manual should tell you where the fuses are that you need to access.
SOURCE: 2003 GMC throttle position sensor
I had the same problem with my 2003 denali and came to find out that it was the battery causing the problem. the battery with sufficient power will dictate the tps. if the battery is low or bad, it won't have enough juice to allow the tps to. work. get your battery checked.
SOURCE: where are the oxygen sensors located?
There will be one located before, and one located after the catalytic converter for each exhaust that you have
SOURCE: Where is the horn located on a 2003 GMC Yukon XL
The rt horn is up behind the fog lamp on the radiator core support . The left horn is wedged between the left head lamp and the washer jug the washer jug needs ot be removed to replce the left horn. Remove the battey the battery tray then the upper bolt on the washer jug then disconnect the washer hoses along the fender by the under hood fuse box. loosen the front of the wheel well splash shield and remove the bottom bolt on the washer jug and disconnect the washer pumps and fluid level sensor connector remove washer jug to gain access to horn
SOURCE: Need 95 gmc jimmy vacuum diagram. I have a loose
THat goes to your map sensor. If you look very closely under your hood there will be a vac line diagram there
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