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Old August 17th, 2007, 08:31 AM   #1
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Default 99 dodge 318 question..

truck keeps going low on oil like ever few hundered mile.. only has 53000 miles so i dont think its blow by... and its not leakin on the ground any ideas?
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Old August 17th, 2007, 08:38 AM   #2
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Oil gnomes
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Old August 17th, 2007, 08:44 AM   #3
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The plenum gasket is shot. The oil is going through the tailpipe. Take the throttle body off and shine a light into the intake. If it is oily, the gasket is screwed. If so, you have a few options. You can replace the stock gasket, then wait for it to blow out again. You can buy a billet plate to replace the flimsy stock plate that flexs and allows the gasket to blow out. Or you can go with a Mopar performance intake that doesn't use the plenum style setup. It's one solid piece on the bottom so there is no place for it to leak. I used the aluminum billet plenum plate from APS Precision. It was about $100 or so. But, I didn't have to worry about it blowing out again.
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Old August 17th, 2007, 09:58 AM   #4
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most likely what scrambler said, i had to do it on my old ram, now my durango is having the same problem so next week the durango will have a new intake
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Old August 17th, 2007, 09:03 PM   #5
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Wow My 99 Kota has 110000 miles on it ,a lot of towing and I have not experiecned that.
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Old August 17th, 2007, 09:07 PM   #6
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could be your pvc valve, but most likely it is your plenum gasket.
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Old August 18th, 2007, 09:29 AM   #7
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well the gasket was done at 40k.... by the last owner. where do i get the good gasket from? how can u tell if its the pvc?
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Old August 18th, 2007, 09:30 AM   #8
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Quote:
Originally Posted by snocross2xtremes View Post
well the gasket was done at 40k.... by the last owner. where do i get the good gasket from? how can u tell if its the pvc?
Dodge sells a metal plenum gasket for the 318s/360s
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Old August 19th, 2007, 09:11 PM   #9
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felpro also makes metal cored gasket. but the ones napa sells are horrible. and thats also what i would bet your problem is.
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Old August 20th, 2007, 06:57 AM   #10
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http://www.apsprecision.com/billetplenum.html

This is the best set-up that I know of for "curing" this issue other than going with the Mopar performance intake with the solid bottom. But that is a $500+ fix. But, you get the better HP.

The main reason the original gasket blows out is due to the flimsy stock plenum plate flexing. The APS plate is 1/4" thick billet aluminum and doesn't allow that to happen. I'm sure you could get one made cheaper if you had the right measurements though, but $140 for the kit with the intake gaskets and intake bolts included isn't a bad deal.

Last edited by 84Scrambler; August 20th, 2007 at 07:00 AM.
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