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    • By WHITE DIAMOND 12
      New here just made an account to ask a few questions but I'll stick around for a little while. I have a 12 Silverado 5.3 LC9 114xxx miles. I had cylinder 7 throw a misfire code pulled plug and it was oil fouled. I'm getting the notorious litter noise. I don't know exactly how much oil it is consuming but I would guess at least 2 qts every 2-2500 miles. I guess my question is should I even worry about the lifters going out with that much oil lost and the cyl 7 plug fouling out? Or should I just save my money and put toward a new engine? I don't mind pulling the heads and putting lifters in but if it needs pistons anyway I guess I'm thinking what's the point. 
       
       
    • By CSI-WALLEYE
      I am new to the Forum and have a 2017 Sierra with 12K on it.  I understand the principle behind the catch can and it makes sense.  The problem I have is that there is a lack of evidence that it actually does what it says it will do.  I have no doubt it removes water and oil but does it actually reduce the carbon build up on your valves?  With the amount of money involved in selling an promoting these things I can believe that someone has not performed any type of controlled scientific study.  It would be simple for a company with a fleet of vehicles to take a group on new trucks and have some with and without catch cans.  After a certain amount of time or mileage you look at the valves and scientifically measure the amount of carbon on the valves.  I have not been able to find such a study.  does anyone know of the existence of one?
       
      Alternatively, does anyone on the forum have a GDI truck with high mileage that does not have any carbon fouling problems?  How are you managing you maintenance?
       
      I have no problems installing a catch can but I would like some actual proof that it does what it says it does. 
    • By CrazyZ01
      Finally broke down and bought an Elite Engineering catch can.  After some research, I got over the worries of installing one and warranty issues. For GDI engines I think these are a must have.  I would rate my engine as ‘severe duty’ for this application as my commute is very short, 3 miles to a Park & Ride to catch a bus.  I live in MN so it’s cold in the winter, most days the engine does not fully warm up.  I took pics of the back side of the throttle body, not filthy, but dirtier than I expected. I cleaned it up and plan to do again at every other oil change.  The intake was wet with oil/moisture, looks like a lot, but I’d guess it’s about a tablespoon or 2.  With the 6.2 the PCV vents on the front side, covienent for cleaning purposes, would expect it to be somewhat cleaner further back in the intake. I did not do a clean side separator as I don’t do WOT much, might regret it later, but intake tubes were clean and dry so should be good there.  I re-used the GM PCV connectors, ordered a replacement PCV vent hose in case I need to go back to OEM. Looks sharp and I have an east swap solution.  While I was there installed an AirRaid Jr kit, I like the flow better with filter and intake tube.  It’s almost worth it to keep the oil change guys from always showing you your ‘dirty air filter’ 😱 Overall easy install and a fun Saturday project.  I highly recommend a catch can for any GDI engines, eventually the valves will get dirty and need to be cleaned, I don’t think a catch can will eliminated this, but I think it will makes those cleanings fewer and father bewtween!



    • By 2011rado
      I have a 2011 Silverado with 125k miles, bought the truck with 90k and found out the problems with the active fuel management on these model trucks so I put a programmer in the truck to delete those hoping it would help make the engine last longer. It’s is now burning oil, has a puff of white smoke when it starts after sitting for more than 3-4 hours, and the fuel alcohol sensor acts up when it’s cold outside making the truck start rough and idle rough for about 30 seconds. Is anyone else having all these problems? 
    • By Coleman71
      I just bought a 2017 GMC SLT with the 6.2L and 8 Spd. It had 8700 miles on it. It will idle a little rough at idle momentarily. I only run premium gas, is that normal for the 6.2L? I've installed a Magnaflow 12909 muffler w/o flapper valve and an AFM Momentum CAI. Also, since I've had it, it has a tick that is heard when your standing next to it, or in a drive thru with the window down. Is that normal? After reading on here I'm worried about the afm lifters causing it. I plan on getting a Hypertec programmer so I can change the afm to 70mph and adjust the shifting so it's less clunky. I also will be installing an Elite Engineering EX-2 catch can kit. Will these additions help with the common afm issues? To make it more reliable in the long run? Anyone with experience or knowledge please educate me on this, thank you

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