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Angel B.
Dodge Dakota
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10/27/2005
23:51:50
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 Subject: oil on the IAT
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My IAT is still in the intake manifold and I am almost positive that there should not be any oil up there. Can anyone tell me what could possibly be going wrong or is already bad??
Thanks
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Rob C
Dodge Dakota
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10/28/2005
00:09:00
| RE: oil on the IAT
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Give us more information. Are you saying, you pulled the IAT out and there's oil on it or that the IAT is installed and oil is coming out from around it? What exactly are you seeing?
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Angel B.
Dodge Dakota
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10/28/2005
00:13:16
|  RE: oil on the IAT
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I pulled out the IAT and found oil on it, I could see a little blue from the little resistor that had oil on it but other that that it was all black with oil on it, and I am not talking like a lite coat I tried scrubbing the oil off with a tooth brush and some degreaser and I barely took any off of it so its as if it has been baked on. I also shoved my pinky in the hole and came up with a little bit of oil on my finger as well.
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N56629
Dodge Dakota
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10/28/2005
06:31:08
| RE: oil on the IAT
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You either have a plenum gasket leak or you pulling a lot of oil thru your pcv valve.
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bubba
Dodge Dakota
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10/28/2005
11:27:12
| RE: oil on the IAT
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keep your pinky out of your oily hole
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Rob C
Dodge Dakota
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10/28/2005
12:01:15
| RE: oil on the IAT
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You've got a 4.7 right? You're probably pushing oil through the PCV system. Have you checked the PCV valve? Have you pulled off the CAI and looked at your throttle body and inside the intake tube for signs of oil or oily grime? Your engine isn't running unusually hot is it? If so, you might have a catalytic converter plugging up, causing a lot of crankcase pressure. Good luck.
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bubba2
Dodge Dakota
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10/28/2005
15:55:52
| RE: oil on the IAT
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I put a little bit of slick oil lube on my peeper and stuck it in her hole.
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Angel B.
Dodge Dakota
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10/28/2005
17:56:08
| RE: oil on the IAT
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I do have a 4.7 and "no" I’ve been to busy doing mods on my truck to even check the pcv valve. I have a little more info for you I recently changed my spark plugs and I noticed a little bit of oil on only a couple of spark plugs. Still possibly related to the pcv valve?
I am going to port and polish my TB this weekend so it will allow me a chance to look inside my intake manifold and see what is going on, I will check my pcv valve and let you know what I find.
Thanks Rob.
WTF Bubba, YOU MUST BE GAY!!! Cause I am a dude!!!
Angel is actually quite common in the Hispanic community for males!! If you are not going to be helpful on these forums you might as well stick to your gay chat groups and keep from wasting our time!
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Angel B.
Dodge Dakota
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10/28/2005
18:26:03
| RE: oil on the IAT
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Ok couldn’t wait, pulled out the old Haynes manual and found that the pcv valve is actually pretty easy to check, I pulled it and it too is covered in oil. The manual says "shake the pcv valve, listen for a rattle. If the valve doesn't rattle, then replace it with a new one", mine does rattle so does that mean that I shouldnt replace it??? Or should I replace it anyways??
So are you trying to tell me that oil went through the pcv valve, through the hose into the intake manifold? If so, do I have to replace the hose since it too probably has oil in it?
Why exactly would you want a hose running from the oil filler tube to the intake manifold?? Can anyone shed some light on what the function of the pcv valve is? I know that I have asked a lot of questions but I know that there is an endless amount of knowledge on this forum.
Thanks
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pete
Dodge Dakota
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10/28/2005
19:32:36
| RE: oil on the IAT
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PCV= positive crankcase ventilation
straight from the manual:
"the pcv operates by engine intake manifold vacuum. filtered air is routed into the crankcase through the air cleaner hose and crank case breathers. the metered air, along with crank case vapors are drawn thru the pcv valve and into a passage in the intake manifold. the pcv system manages crank case pressure and monitors blow-by gasses to the intake system, reducing engine sludge formation....
when the engine is operating, fresh air enters the engine and is mixed with crankcase vapors. engine vacuum draws the vacuum/air mixture thru the fixed orifice and into the intake manifold. the vaoprs are consumed during engine operation"
some say you need it- others have ditched it in favor of a filter/breather
ditch the haynes.. pick up an FSM - itll be your best move yet
pete
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Rob C
Dodge Dakota
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10/29/2005
00:25:02
| RE: oil on the IAT
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The PCV system replaced the old breather that cars in the US used prior to 1968. Mainly as an emissions measure, the PCV takes crankcase gases and draws them into the intake manifold through the PCV valve and allows filtered air into the crankcase. The crankcase gases are mixed with the fresh air stream going into your engine and reburns them. These gases can be highly combustible and are mostly the product of air/fuel combustion gases getting past your piston rings and into your crankcase. If these gases built up, they would actually resist your pistons moving down in the cylinders. Prior to 1968, the breathers allowed the gases to be vented into the atmosphere which became an emissions concern. The PCV valve makes sure that the flow of gases is always from the crankcase to the fresh air stream and not the other way. For example during a backfire of the engine, remember those gases can be combustible.
The PCV valve is pretty inexpensive so I'd replace it. You need to find out why you're pumping oil into the engine through the PCV system.
Many times when this happens, it's because you've got a catalytic converter clogged up and the exhaust gases can't escape so, the crankcase pressure builds up and the only way out is through the PCV system. The gases end up pumping crankcase oil with it into the air filter housing. Of course, this is normally accompanied by your engine running pretty poorly and overheating.
What type of CAI are you running? What modifications to the intake have you done?
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Angel B.
Dodge Dakota
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10/29/2005
03:00:46
| RE: oil on the IAT
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To answer your original question Rob (which is the name of my best friend who is in Iraq right now) my truck has NOT been running HOT, the only time that it ran close to the red-line on my temp gauge is when I took off my stock clutch fan, but I only went around the block and then put it right back on.
I am actually running a home-brew intake that I built straight off of this website, the only thing that I have changed is that I made a custom intake/ram-air box that directs air from the left side of the radiator straight into a k&n filter that is enclosed in a box that takes air straight from the left side of my grill where the plastic piece used to be.
http://www.dodgedakota.net/boards/v8/9199.html
I have yet to relocate my IAT due to the fact that on my 4.7 I have to plug up my existing hole where my old IAT sensor was so I am just buying a new one and leaving my old one in the stock location and running the wires into the new one that I will drill into the tube that runs from my CAI into my TB.
I have already removed my TB (to port and polish it this weekend) and found that my Intake manifold is actually quite covered in oil also, I shoved my hand into it with a white glove on and it came out covered with oil, I am actually quite worried now.
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pete
Dodge Dakota
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10/29/2005
12:55:14
| RE: oil on the IAT
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dont worry about the oil- its normal
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Rob C
Dodge Dakota
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10/29/2005
18:06:56
| RE: oil on the IAT
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No it's not, I'd check the PCV hose running to the back of the intake manifold and the two hoses that come out of the back off your engine (crankcase fresh supply) and go to a T connector into a single hose that used to go to your stock air box. You must have a problem somewhere in your PCV system. Good luck!
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pete
Dodge Dakota
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10/29/2005
18:13:28
| RE: oil on the IAT
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how is it not?.. it sucks air right from the valve cover- where there is copious amounts of oil being slung around.. its bound to pick some of it up. i wouldnt worry about it unless youve got like some puddles or something
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Rob C
Dodge Dakota
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10/29/2005
23:51:15
| RE: oil on the IAT
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He's got a 4.7, it draws in gases from the oil filler housing where there's no oil being slung around. I've got the same engine and I've never had oil on the IAT or the PCV valve dripping with oil and I certainly haven't had oil in the intake manifold like he's talking about. It's not normal.
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N56629
Dodge Dakota
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10/30/2005
09:12:32
| RE: oil on the IAT
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Start simple and replace the PCV valve first. Blow out the hose if you wish but I wouldn't replace it.
I don't know about the 4.7 but on many engines excessive blow-by will carry a lot of oil mist with it and enter your intake manifold. Some of the oil tends to seperate out of the blow-by gases settling on the walls and bottom of the manifold. If you think that is a possibility then you might want to do a compression check.
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Angel B.
Dodge Dakota
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10/30/2005
22:51:14
| RE: oil on the IAT
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Can you believe that no one carries the PVC valve!!, I went to pepboys, AutoZone, advance and Napa and no one carries a PVC for a 4.7. I guess that it is a dealer only item!
Here is some more fuel for the fire! I went to take off the TB to port and polish it this weekend and found the IAC Solenoid full of oil too. I ended up taking it off and cleaning the hell out of it with some carb cleaner. I cannot believe how much oil I am finding in what should be the intake section of my engine!
I did though find a possible problem, when I did the "homebrew" intake this website called for you to buy a little breather type filter and it too was full of oil and dirty, I am sure that it was not allowing any fresh air in. So I ended up drilling a hole in my CAI and running a hose to it, (seeing as how I was already drilling a hole to relocate my IAT).
I have already cleaned up as much oil as I can through the PCV hose, in the intake, and all through the TB. I plan to run down to the local Dodge Dealer and picking up a new PCV valve, and closely monitor my oil problem and see what I come up with.
Thanks Again to all
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