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post #1 of 16 (permalink) Old 03-20-2011, 12:58 PM Thread Starter
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Question oil in upper intake???

hey ive tried everything i can think of but i still dont understand why im getting oil in my upper intake??? and its not just a little oil is about an oz or more sitting in the runners. ive replace the pcv valve and im running about half a quart low on oil to c if maybe that would help but still im getting oil in the intake and i know its coming from the pcv hose. what could the problem be??? and i dont burn oil or use any between oil changes. im worried that my intake valves are just gonna be gummed up with sludge and gunk. anybody else have this problem??? does this mean ive got a bad blow by problem???
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post #2 of 16 (permalink) Old 03-20-2011, 01:06 PM
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What brand pcv valve are you running?
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post #3 of 16 (permalink) Old 03-20-2011, 01:31 PM Thread Starter
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whatever oreillys had. idk the brand.
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post #4 of 16 (permalink) Old 03-20-2011, 01:34 PM
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Sounds like you have about a normal amount of oil in the plenum. Only way to really prevent it would be to completely disconnect the breather system (PCV and regular breather) from the plenum, or add an oil separator...but its really not all that necessary..As long as you keep your PCV system maintained it wont harm anything.
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post #5 of 16 (permalink) Old 03-20-2011, 01:59 PM Thread Starter
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Originally Posted by Daytrepper View Post
Sounds like you have about a normal amount of oil in the plenum. Only way to really prevent it would be to completely disconnect the breather system (PCV and regular breather) from the plenum, or add an oil separator...but its really not all that necessary..As long as you keep your PCV system maintained it wont harm anything.
normal amount??? i took the intake off when i replaced my steering rack and it ran out of the throttle body when i tipped it to that side the vacuum port for the cruise. the lower intake looked to have oil residue in the ports too. does the pcv need to have the intake vacuum to operate properly?? or can i block that off and add a separate valve and a breather filter?
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post #6 of 16 (permalink) Old 03-20-2011, 02:05 PM
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normal amount??? i took the intake off when i replaced my steering rack and it ran out of the throttle body when i tipped it to that side the vacuum port for the cruise. the lower intake looked to have oil residue in the ports too. does the pcv need to have the intake vacuum to operate properly?? or can i block that off and add a separate valve and a breather filter?
Yep. That is normal for 3.2/3.5. The PCV system needs intake vacuum to operate. You could remove it, plug it off and add just a breather filter (not attached to the plenum at all) but there is a chance it could mess with crankcase pressure and cause oil leaks....I suggest you leave it alone. If you happen to have the plenum off, dump out the oil. It will take 6-8 months for it to build back up again, this is normal for the 3.2/5.
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post #7 of 16 (permalink) Old 03-20-2011, 02:11 PM Thread Starter
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Yep. That is normal for 3.2/3.5. The PCV system needs intake vacuum to operate. You could remove it, plug it off and add just a breather filter (not attached to the plenum at all) but there is a chance it could mess with crankcase pressure and cause oil leaks....I suggest you leave it alone. If you happen to have the plenum off, dump out the oil. It will take 6-8 months for it to build back up again, this is normal for the 3.2/5.
wow i guess but to me oil in the intake is bad but yeah last time i had it off i cleaned it out with some brake clean and let it dry out but to me its just worrying. thanks for the help though. oh and another thing where besides the dealer can i find the o-ring for the i think its called the manifold tuning valve? the one on the very front center not the other one up towards the main center that switches the runners from long to short.
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post #8 of 16 (permalink) Old 03-22-2011, 08:14 PM
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So what's the concern about oil being in the plenum? What's the harm?

Someone has posted the industry standard part no, for that o-ring.
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post #9 of 16 (permalink) Old 03-22-2011, 08:20 PM
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Someone has posted the industry standard part no, for that o-ring.
We don't know the guy's name but he almost always has some at the meets. Check with him at Dan's next month.
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post #10 of 16 (permalink) Old 03-22-2011, 09:08 PM
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We don't know the guy's name but he almost always has some at the meets. Check with him at Dan's next month.
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post #11 of 16 (permalink) Old 03-22-2011, 09:12 PM Thread Starter
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Quote:
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So what's the concern about oil being in the plenum? What's the harm?

Someone has posted the industry standard part no, for that o-ring.
i thought oil in the intake would eventually get hot enough to turn into sludge and gum up the intake valves and stuff like that.
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post #12 of 16 (permalink) Old 03-23-2011, 10:55 AM
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i thought oil in the intake would eventually get hot enough to turn into sludge and gum up the intake valves and stuff like that.
possible, thats why we all like Seafoam
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post #13 of 16 (permalink) Old 03-23-2011, 12:40 PM
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Quote:
Originally Posted by Rusty Shakelford View Post
i thought oil in the intake would eventually get hot enough to turn into sludge and gum up the intake valves and stuff like that.
Seen that once or twice, in both cases there was bad maintenance of the PCV system, and oil changes etc. The owners of the cars basically never opened the hood. Seen them at 100K, and close to 200K miles with good maintenance, no sludging at all.

Last edited by Daytrepper; 03-23-2011 at 12:47 PM.
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post #14 of 16 (permalink) Old 03-23-2011, 04:45 PM Thread Starter
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well i use full synthetic oil and change it every 3000 miles or 3 months. i only had round 2000 miles on my last service and i love using seafoam too!!! i just never get any smoke lol but i use it about every 2nd or 3rd oil change.
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post #15 of 16 (permalink) Old 03-23-2011, 04:56 PM
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Originally Posted by Rusty Shakelford View Post
well i use full synthetic oil and change it every 3000 miles or 3 months. i only had round 2000 miles on my last service and i love using seafoam too!!! i just never get any smoke lol but i use it about every 2nd or 3rd oil change.
Be careful about too much seafoam. You can damage O2 sensors and converters. Basically turns them into a blast furnace. Smoke with seafoam means you have put too much at once in.
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