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Greg
Dodge Dakota
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11/30/2006
22:16:06
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 Subject: Black Greasy airFilter
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Message:
I own a 2002 4.7 Litre Automatic 4X4 Sport. Approximately every 3 months, the air/filter/is becoming coated with a black greasy material. The shop that changes my oil, suggested getting the injectors cleaned. Have you/ever/seen this, know the cause, and what the resolution is?
I should also mention that my gas mileage is horrible. 12 mpg. City or/Highway.
TIA
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DakKink
Dodge Dakota
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12/01/2006
12:46:26
| RE: Black Greasy airFilter
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Message:
I personally would imagine it to be the vacuum attached to the back of your throttle body. Not sure exactly what the problem may be could be something to do with your PCV valve
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911mike
Dodge Dakota
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12/01/2006
13:54:00
| RE: Black Greasy airFilter
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Message:
which side is getting coated?
-air intake- or -to engine-
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Greg
Dodge Dakota
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12/01/2006
14:00:16
| RE: Black Greasy airFilter
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Message:
The Air Intake side.
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Kowalski
GenIII
12/01/2006
18:28:17
| RE: Black Greasy airFilter
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Message:
That's odd - don't know why he'd think that's related to fuel injectors then. Bad milage could just be related to clogged filter; driving any where its subjected to something that's clogging filter like that ? Any thing blowing oil or grease near the intake ?
Lead, follow, or get out of the way
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Greg
Dodge Dakota
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12/01/2006
18:30:49
| RE: Black Greasy airFilter
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This was one of those quick oil change places that I think was trying to up sell me, hence my query here. The air filter is definitly very dirty in a very short time frame. I am going to take it into my regular shop and have them diagnose. I'll post their results. A mechanic I am not. :)
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daddio
Dodge Dakota
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12/01/2006
20:06:11
| RE: Black Greasy airFilter
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Message:
try a new PCV. if it is partially clogged or not working properly it would cause pressure to build up in the engine and the oily blowby has to go somewhere.
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PB
Dodge Dakota
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12/01/2006
22:53:51
| RE: Black Greasy airFilter
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Message:
you have something called blow by and it's caused by high oil pressure
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GraphiteDak
GenIII
12/01/2006
23:10:15
| RE: Black Greasy airFilter
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Message:
The last post is kind of funny... LOL!
Blow by is gases escaping past the piston rings during combustion. That presurises the crank case. The crank case VENT is a rubber tube that plugs into the air intake tube AFTER the filter on the filter box cover. So... some of that gets sucked back into the intake tube. You will see black film on the throttle body and blade. All normal. Of course as said, a messed up PVC valve would make it worse.
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