I have seen different people in different places post different sizes of exhaust as stock for my 2014 Sierra L83. Some say 2.5 some say 2.75.
I am considering replacing the muffler with a Dynomax Super Turbo, perhaps 17739. I had the factory L83 5.3 replaced with another L83 5.3 from Jasper Engines. I also put new Walker Cat / Y pipe on. I would appreciate opinions suggestions about what would be a good muffler setup. My main interest is a low rumble and the best flow / fuel mileage I can get. Not interested in straight through glass packs or loud exhaust. Those days are way behind me now.
Thanks Guys.
Its coolant disguised as oil.
TSB 20-NA-166 - 20-NA-166 1..3
"To inspect for this concern, add coolant dye to the system, run the engine through warm up, pressurize the cooling system after warming the engine to operating temperature (let the engine cool overnight) and inspect the suspect cylinder with a borescope for coolant dye evidence. At times it may be necessary to remove the head for inspection. If the head casting line is the concern, the intake port will be wet with a coolant oil mix"
I'd say its the head, and its either leaking at the casting line and dripping down the intake into the cylinder, or its another spot on the casting itself at the cylinder that is getting wet.
Can you sample the pooled liquid, enough to confirm it is oil?
...That its not fuel or coolant.
Also, make sure combustion gases aren't entering the cooling system.
Simply put, either oil being pushed up past the rings (this really isn't possible), oil leaking past the head gasket, oil leaking past the valve, oil entering through the intake air path. If none of this is likely - it may not be oil.
What could be likely is the fuel injector leaking down. A puddle of gas would still smoke and rough idle. (Same cylinder has the same problem after injector replacement?)
What is the crank time first thing in the morning, when the puddle would be present? Does it seem like the high pressure fuel pump needs an extra second or two to rebuild the pressure that injector 8 may have let bleed off? Check the fuel pressure via a scanner prior to starting the engine.
Good information! I didn't know about the dementia aspect and asked for a general for my second knee. I'd heard that recovery room time is usually shorter with a general. The anesthesiologist talked me out of it and I had the spinal. Inconvenience and/or discomfort is a small price to pay for reduced risk!
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