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Re: 2005 GMC PCV Valve 5.3L [Re: Wingman] #2944321 03/19/13 03:25 PM
Joined: Mar 2009
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xxch4osxx Offline
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Any pics?


2015 RAM SXT Crew Cab 5.7 with 6 speed tranny.

2008 Mazda 3 GS Sport Hatchback 5sp MT (Girlfriend's car)

Re: 2005 GMC PCV Valve 5.3L [Re: The_Jake] #2944701 03/19/13 08:37 PM
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OtisBlkR1 Offline
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Originally Posted By: The_Jake
If it is slipping out try some gorilla glue on it and allow to dry overnight in your garage. Don't use too much as that stuff expands 3x.


what are you talking about ????? glue ??? this truck has a non-removeable PCV setup.


06 Silverado 92,xxx Mobil 5-30
11 Honda Accord 38,xxx Mobil 1
06 Milan 69,000 Mobil 1
12 Ranger 800XP & 14 TRX 450R

Re: 2005 GMC PCV Valve 5.3L [Re: Wingman] #3049231 06/29/13 08:46 AM
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TiredTrucker Offline
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The AFM (automated fuel management) setup on many GM engines that causes the engine to go to 4 cylinder mode when less power is needed has caused a plethora of oil consumption problems. Supposedly, this problem got resolved with the late 2011 engines on, but time will tell. Many, like me, have effectively disabled the AFM from ever going to 4 cylinders. The engine remains in 8 cylinder mode all the time.

Now, to the oil problem getting into the intake from the PCV system. Simple. Most, if not all, folks should consider installing an oil catch can in the PCV line from the PCV valve/fitting and the intake manifold. This will filter out any oil that normally is drawn up with the crankcase gasses. This oil can reduce power, in that the ECM has to compensate and sometimes resort to low octane settings in the ECM. Also, this oil will coat the inside of intake manifold, add the EGR exhaust gasses coming in, and you have a recipe for serious crud. And some of this will coat throttle bodies and valves.

All in all, just a bad situation just waiting to happen. These oil separators are relatively inexpensive and not difficult to plumb into the PCV line. I just purchased a 2013 Silverado with 5.3L and an oil separator will be going on within the next few weeks.


Freedom is not about having the choice to do what you want, but the choice to do what you ought.
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