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I have a 2006 GMC Envoy Denali 5.3L engine that has the displacement on demand system - switches off 4 cylinders under the right conditions to increase fuel economy. I bought it as a project vehicle, tuned it up, replaced the plugs and dumped the really nasty oil that was in it. The engine has 162,000 and clearly the previous owner didn't keep up on service but it is a very nice truck.
Usually I do my own work but with too many projects and too little time I decided to take it to a reputable mechanic. End result, we've determined that my number 4 cylinder has inoperable valves. They've tested the selenoids for the DOD system and found them to be operable. Futhermore, I had them pull the push rod to see if it was bent or scored, it was neither. The DOD system is throwing confusion into the diagnosis for me. The mechanic is recommending we pull the head.
Line of Questions #1
Is there something the mechanic may be missing with the DOD system that would get the valves working again. Can I go to non-DOD heads?
Line of Questions #2
If I go with a new engine, can I get something with additional performance that doesn't have DOD? Will the computer only take a DOD engine? If so can the computer be switched so I can use any LSx engine?
Retaining the 8% gain in fuel economy that Displacement on Demand gets me doesn't seem worth the limitation of choices in heads/engines.
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