SOURCE: How do I check and possibly replace the engine oil
Oil Pressure Test
Check for proper oil pressure at the sending unit passage with an externally mounted mechanical oil pressure gauge. A tachometer may also be needed, as some specifications may require running the engine at a specific RPM.
Compare the hot oil pressure reading to the specification. If the reading is low, check the cold pressure reading against the specification. If the cold pressure is well above the specification, and the hot reading was lower than the specification, the engine may have the wrong viscosity oil. Change the oil, making sure to use the proper grade and quantity, and then repeat the test.
Low oil pressure readings could be attributed to internal component wear, pump related problems, a low oil level, or oil viscosity that is too low. High oil pressure readings could be caused by an overfilled crankcase, too high of an oil viscosity or a faulty pressure relief valve.
SOURCE: Code P0121 on 2006 GMC
Classic signs of idle air control not able to cope with sudden engine loads. Cleaning should resolve this. Remove ducting from air cleaner to throttle entrance. Spray with carb. choke cleaner or WD40 spray and wipe back to the alloy finish. clean the the throttle plate and push the throttle open with your fingers and clean in behind as best you can. Clean the passageways to the idle air control valve. Remove the valve and give it a thorough clean up. Reassemble and it should all be good.
SOURCE: Code P0121 on 2006 GMC Envoy Denali Check eng.
Cleaning the throttle body is certainly the right thing to try first. Make sure you clean the throttle plate as well.
Testimonial: "Thanks. It seems to have worked."
SOURCE: how to remove rear suspension airbags on 2006 gmc
they are bolted in a not to hard to remove once the air is drained from them however you can not drive it without the air bags. It will bounce way to much to control the truck.
SOURCE: 2006 GMC Envoy Denali, Universal Garage door
GOTO HOMELINK.COM TO DOWNLOAD INSTRUCTIONS FOR THIS SYSTEM
YOU WILL NEED TO RE PROGRAM THE UNIT WITH YOUR DOOR OPENER.
HOPE THIS HELPS
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