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RPM Inching up with Silverado 4.8 (affects GM 5.7 and 6.??? too)
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<blockquote data-quote="Texasmark" data-source="post: 1497848" data-attributes="member: 27848"><p>Well good, or bad depending on how you look at it. Good that it's not GM unique. Surprised it's not part of a regular dealer routine service. Wonder how much money is puked by the non-informed consumer with this problem who doesn't get the right corrective action in a timely manner....if ever.</p><p></p><p>Still curious as to where the oily residue originates. If it weren't for that, the dust that makes it through the air filter should just blow on by and it not be a problem. Since the EGR is in the same air intake plenum, about 10" on down, maybe that's the source. Maybe when you shut down the engine after running it, there are still residual crankcase gasses present in the plenum and they just settle out the length of the plenum. </p><p></p><p>Wonder if changing the EGR valve would stop it. Don't recall seeing it in my owner's manual. I'm only at 35k miles. I think I recall earlier vehicles requiring a change at around 60 miles. I took the truck in for the state annual inspection which is primarily an emissions test and handily passed that. Must not be all that bad.</p></blockquote><p></p>
[QUOTE="Texasmark, post: 1497848, member: 27848"] Well good, or bad depending on how you look at it. Good that it's not GM unique. Surprised it's not part of a regular dealer routine service. Wonder how much money is puked by the non-informed consumer with this problem who doesn't get the right corrective action in a timely manner....if ever. Still curious as to where the oily residue originates. If it weren't for that, the dust that makes it through the air filter should just blow on by and it not be a problem. Since the EGR is in the same air intake plenum, about 10" on down, maybe that's the source. Maybe when you shut down the engine after running it, there are still residual crankcase gasses present in the plenum and they just settle out the length of the plenum. Wonder if changing the EGR valve would stop it. Don't recall seeing it in my owner's manual. I'm only at 35k miles. I think I recall earlier vehicles requiring a change at around 60 miles. I took the truck in for the state annual inspection which is primarily an emissions test and handily passed that. Must not be all that bad. [/QUOTE]
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RPM Inching up with Silverado 4.8 (affects GM 5.7 and 6.??? too)
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