GM Repair Questions? Ask a Mechanic for Answers ASAP
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
99 through 05 GEN III truck engines may experience any of the following:
The intake gasket seals may be leaking around the intake ports, causing a lean condition. The intake gasket seals may leak around the bottom side of the port, making it a challenge to detect the vacuum leak. The technician may also notice lower than normal MAF readings if the intake seals are leaking.
The guy at autozone said he had the same problem with 2002 avalanch and it was the intake gasket. so I bought it but when looking how to put it on it looks very hard. do you have to remove everything that is on top of the mantifold or just the bolts holding it on.
I had to reset my computer, I will be with you in 2 mins. Thank you ken
Important: The intake manifold, throttle body, fuel rail, and injectors may be removed as an assembly. If not servicing the individual components, remove the manifold as a complete assembly.
Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
Tighten Tighten the EVAP purge solenoid bolt to 10 N·m (89 lb in).
Tighten Tighten the accelerator control cable bracket bolts to 10 N·m (89 lb in).
Important: Lightly coat the MAP sensor seal with clean engine oil before installing.
And what should the fuel pressure be registering
The fuel filter is on the left frame rail under the truck. I would have that replaced first, then have the fuel pump/ intake gasket checked.
Important: Inspect the fuel tank internally and clean the fuel tank if you find a restricted fuel filter.
Tighten Tighten the fittings to 25 N·m (18 lb ft).
engine running, (48-52)
Ken just wanted to let you know it was the fuel filter.
Thanks for all your help