Oil in Intake Tube - Jeep Commander Forums: Jeep Commander Forum
Intakes Questions or advice about intakes? This is the place...

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post #1 of 11 (permalink) Old 02-19-2011, 08:20 PM Thread Starter
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Oil in Intake Tube

I took off the filter tonight to clean/charge it - I have the K&N 77-1545KP on my 3.7 - and noticed that there is oil on the drycharger, filter and just a little on the inside lip of the intake tube...is that normal or do I need to worry? I'm hoping that maybe it's just from snow and rain being kicked up into the engine compartment from normal driving, any help/insight would be appreciated so I can sleep easier tonight while the filter is drying.

2006 Inferno Red 3.7L 4x4 QTI, RR 2.25" Lift, AEV Pintler 17x8.5" Wheels, 255/75-17 BFG M/T KMs, K&N CAI 77-1545KP, MagnaFlow Muffler, 4XGuard Side Guards, Rear Grab Handles, Front Tow Hooks and OEM Trailer Hitch, Fog Lights, Yakima MegaWarrior w/ Extension and 4XGuard Belly Guard.
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post #2 of 11 (permalink) Old 02-19-2011, 08:35 PM
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Had the same problem with my K&N 63 series installed. It turned out to be a bad PCV valve which allowed excess oil to escape. Hope this helps.

Now I am thinking about having the dealer clean the throttle body. It must be covered in oil residue!

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post #3 of 11 (permalink) Old 02-19-2011, 08:40 PM Thread Starter
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Thanks Bob - two questions: 1. how hard is it to replace the PCV valve (just checked that out - looks easy enough that even I can do it?), and 2. would oil residue on the throtle body cause any shifting issues?

2006 Inferno Red 3.7L 4x4 QTI, RR 2.25" Lift, AEV Pintler 17x8.5" Wheels, 255/75-17 BFG M/T KMs, K&N CAI 77-1545KP, MagnaFlow Muffler, 4XGuard Side Guards, Rear Grab Handles, Front Tow Hooks and OEM Trailer Hitch, Fog Lights, Yakima MegaWarrior w/ Extension and 4XGuard Belly Guard.

Last edited by bjamrow; 02-19-2011 at 08:44 PM.
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post #4 of 11 (permalink) Old 02-19-2011, 08:56 PM
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Funny thing you asked about changing the PCV valve. While I was at the dealership (spark plug change) I had them check/change the valve since they would only charge me for the part.

Read this, page 21.

http://www.scribd.com/doc/20028963/J...ssions-Control

I would not think a dirty throttle body can cause shifting issue. Hopefully Robby can chime in on this issue.

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post #5 of 11 (permalink) Old 02-19-2011, 09:54 PM
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Quote:
Originally Posted by bjamrow View Post
Thanks Bob - two questions: 1. how hard is it to replace the PCV valve (just checked that out - looks easy enough that even I can do it?), and 2. would oil residue on the throtle body cause any shifting issues?
A oily/dirty throttle valve would have no effect on the trans unless it was making the engine misbehave in some way......then there would be check engine lights to go with it.
Regarding the oil buildup within the intake.
By all means, any time blow by seems excessive then a replacement PCV is the first thing to do.
I think you may be seeing the air filter oil being pulled into the intake as well.
It is very difficult to not over oil a K&N or any other serviceable filter and that oil will adhere to the intake tubing and build up at any seam.
If excessive blow by is the concern, a new PCV along with a new stock paper filter would be required.
After a thousand miles or so, a inspection would be required.
Oil in the intake tract again would indicate possibly piston rings not sealing.
If everything is dry, you could re-install the K&N knowing the engine is fine and it was the result of over oiling or lazy PCV.
If another inspection reveals oil buildup after the K&N is reinstalled then you know you are over oiling the filter.

Rob


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post #6 of 11 (permalink) Old 02-20-2011, 09:33 AM Thread Starter
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Duh, didn't even think about the oil from the filter...and the amount on the lip of the intake was concentrated in one area, right in the middle, and a very small amount - about a half the size of a dime. I let the filter dry over night, so I think I'll just reinstall after I oil it today and check it in a 1,000 or so - not feeling like putting the old air box back in. Thanks!

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post #7 of 11 (permalink) Old 02-20-2011, 01:45 PM
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If the filter is removed from the intake, stick your hand inside the tube and feel if the oil is coming from the hole in the intake tube. If so, it may be the PCV valve.

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post #8 of 11 (permalink) Old 02-20-2011, 08:21 PM Thread Starter
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Easy enough, I'll take a look at it tomorrow and see, thanks.

2006 Inferno Red 3.7L 4x4 QTI, RR 2.25" Lift, AEV Pintler 17x8.5" Wheels, 255/75-17 BFG M/T KMs, K&N CAI 77-1545KP, MagnaFlow Muffler, 4XGuard Side Guards, Rear Grab Handles, Front Tow Hooks and OEM Trailer Hitch, Fog Lights, Yakima MegaWarrior w/ Extension and 4XGuard Belly Guard.
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post #9 of 11 (permalink) Old 03-05-2011, 10:36 PM
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Had to clean my K&N filter today and noticed oil in my intake as well. I think this is normal since I have a new PCV valve and have been putting 3 light coats of oil on the filter.

If you notice in the last picture, the oil appears to be coming from the right side (pcv valve)settles at the bottom, then travels into the engine (left side).

Just my 2 cents.




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post #10 of 11 (permalink) Old 11-20-2011, 09:05 PM
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that looks like motor oil to me. filter oil is red not brown
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