Tonyrodz
Resident Resident
Just for the heck of it, I'd pull a plug from the left and right side, just to see if you have any fouling from oil on the plugs. If you do then that'll give you a good idea what's going on internally.
New-to-me 5.3 oil burner...
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swathdiver
Full Access Member
Well, my truck doesn't use any oil and AFM is still active. I never heard of a catch can before coming to this site. In my racing days, we put K&N breathers on the valve covers to keep oil out of the throttle body and or intake. Blow by is a high rpm thing, and I rarely spin mine over 3500; but it sure is fun when doing so!
The best way to solve problems such as these and when adding power adders is to make only one change at a time and then test/observe before doing the next. Throwing a bunch of parts at something is never as efficient.
The best way to solve problems such as these and when adding power adders is to make only one change at a time and then test/observe before doing the next. Throwing a bunch of parts at something is never as efficient.
Clive
TYF Newbie
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My '94 K1500 with 251,000 burns about a quart every 1000 miles. Seems about the same as your quart-and-a-half between oil changes (assume changed every 3000 so 1500miles = 1.5qts). No leaks on mine, so I've put it down to old age. $5/1000miles doesnt keep me up at night. I bet my compression is down a bit - I'd test that on your truck and see how much down it is.
OP
OP
ACM
Member
Active Fuel Management, AKA Displacement on Demand, or as I call it "Save the Whales" mode.
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The PCV valve is built into the left valve cover. GM redesigned the valve cover due to excessive oil consumption. I have had my 2009 GMC Yukon XL 5.3 2WD since new. Now at 208K. I changed the valve cover and cured the oil consumption issue. With 225K chances are the PCV is plugged up. This is a cheap and easy fix. I have used a Range AFM Disable but recently had AFM deleted from PCM by Engine Tune shop. Cost was about the same ($150). That way it's gone for good.
Try some Lucas Oil additive. Works wonders for engines that have slow oil leaks and or use/burn oil between changes. I ran that in my 2008 Tahoe until I got the Range AFM Delete module. It stopped the consumption issue. Now that I have the module I have driven it 2,000 miles and it hasn't used any oil so far.
OP
OP
ACM
Member
Ah, s#!t. After owning it for a few weeks, I am noticing white smoke from the exhaust on cold starts. Not huge clouds like some describe, but definitely noticeable. Usually goes away after it warms up.
iamdub
Full Access Member
You sure it's smoke and not steam? Engines and exhaust pipes get water inside them from the moisture in the air condensing when they cool off and sit overnight. The condensation is heated to steam and blown out the exhaust during warm-up. Actually, when it's first started, you'll have sooty water dripping out of the tailpipe.
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