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Misfires, overheating, oil dripping out tail pipes
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Question
wade9047
A little background: Im learning as i go here so bear with me. My 5.3 Silverado (has 195000 miles on it but very well maintained until the last couple years I got somewhat lazy about it). Over the course of that time I stated losing some balls on the low end and hearing a faint fluttering noise coming from behind drivers side dash when accelerating. It was annoying but reliable so I didn't think much of it.. and boy it's thirsty for oil. I never find leaks beneath my truck and I would get an oil change every other month as well as adding a quart in between changes. I have shorty headers on it and no cats and 3 inch pipes (wish I stayed with 2 1/4).
Heres where I'm at: its running rough at idle and throwing PO300 codes. Misfires were occurring on all cylinders but mostly on two of them (cylinders 7 and 8 misfires over 1000 times over the course of 100 miles, the others arent misfiring nearly as much). I found this out after taking it to a shop after it randomly overheated and shut off a couple of days ago. The coolant looks like my baby's diaper and was a little low but no obvious leaks. They did pressure test, sniff head and checked for leaks, but found nothing. I feel stupid to admit but I've had this truck 3 years now aND I didn't know you needed to change out the coolant.(I plan to get it flushed out when I can). I will get it compression tested today and I will probably do a tune up on it just to be sure (replace at least plugs/wires, fuel and air filter, etc.) In the past year or two it seemed to burn a lot of oil, but this trick always did and ran fine. But now im getting what i think is oil coming out of the tailpipes and little white puffs of smoke (Sometimes at idle but almost always when accelerating.)
I guess the elephant in the room that I'm trying to ignore (or at least put off) is an issue with a burnt valve or leaky head gasket. It seems like I have to play the game of tear the engine down or fix everything until it's better. Hopefully that wasn't confusing, but I can clarify if need be and the compression test I'll get done today will obviously help out. Thanks for any help.
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