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 Post subject: oily intake
PostPosted: Sat Sep 20, 2014 2:05 pm 
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Hi guys, havent been on here in a long time, life is busy and I'm getting old :btruestory: well anyways, my wife's 02 Regal has been eating antifreeze (quart per week) so it was time to take the plenum and intake manifold off. I just pulled the plenum and discovered a fair amount of oil sitting on top of the intake manifold. Is that normal? It sure does not seem right. I hope the LIM gaskets are the culprit for the antifreeze problem, I have none in the crankcase so I'm hoping its not head gaskets. How do you tell if the plenum is warped?


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 Post subject: Re: oily intake
PostPosted: Sat Sep 20, 2014 3:52 pm 
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How much is a fair amount? Sounds like the the UIM failed around the EGR.

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 Post subject: Re: oily intake
PostPosted: Sat Sep 20, 2014 5:02 pm 
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well, thats hard to describe but, maybe a shot glass down in one pocket where a intake bolt is, and it is near the front where the PVC is


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 Post subject: Re: oily intake
PostPosted: Sat Sep 20, 2014 5:05 pm 
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little concerned about this, the Lower intake gasket had two bad areas where the coolant ports are, but do not see why it would be eating coolant. My neighbor who is a pretty good mechanic thought it strange too. Well back together now


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 Post subject: Re: oily intake
PostPosted: Sat Sep 20, 2014 7:41 pm 
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deano55 wrote:
little concerned about this, the Lower intake gasket had two bad areas where the coolant ports are, but do not see why it would be eating coolant. My neighbor who is a pretty good mechanic thought it strange too. Well back together now

I think nos4blood70 may have a good point. The plenum around the EGR valve may have failed. I think it would be a good idea to investigate thourghly before reassembly. - BC

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 Post subject: Re: oily intake
PostPosted: Sat Sep 20, 2014 9:48 pm 
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1oldman wrote:
deano55 wrote:
little concerned about this, the Lower intake gasket had two bad areas where the coolant ports are, but do not see why it would be eating coolant. My neighbor who is a pretty good mechanic thought it strange too. Well back together now

I think nos4blood70 may have a good point. The plenum around the EGR valve may have failed. I think it would be a good idea to investigate thourghly before reassembly. - BC
I did not see anything peculiar :dontknow: Its all back together now. What should I have looked for? If it still eats coolant I'll have to pull it off and look closer. Thanks guys


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 Post subject: Re: oily intake
PostPosted: Sat Sep 20, 2014 11:29 pm 
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What you described in the LIM is actually normal. In any case, if the UIM has never been replaced it might be time to do so. The three holes by where the throttle body attaches serve as the throttle body coolant loop and the spot where the EGR gasses come back into the intake. The hot EGR gasses eventually make the little pipe hot enough to deteriorate the plastic UIM which lets the coolant from the throttle body coolant loop leak in. I just blocked the loop by JB welding a pair of dimes in the LIM.

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 Post subject: Re: oily intake
PostPosted: Sun Sep 21, 2014 7:14 am 
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would it be clearly noticeable? If it would, mine looked fine.......I think


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 Post subject: Re: oily intake
PostPosted: Sun Sep 21, 2014 7:15 am 
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that car should have a SC anyways


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 Post subject: Re: oily intake
PostPosted: Sun Sep 21, 2014 9:46 am 
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Every car should have had the blower! Hahahaha

It wouldn't be clearly noticeable but you'd be losing coolant.

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 Post subject: Re: oily intake
PostPosted: Sun Sep 21, 2014 12:54 pm 
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Back to the oil problem, where exactly was the oil? You say on top of the LIM, was it under the plastic plenum or on top by the intake gaskets / intake manifold bolts? If it was by the bolts then the issue there is leaking valve cover gaskets, very common problem.

As for your coolant leak most likely was your intake gaskets or the UIM, very very small chance it is your head gaskets so I wouldn't even worry about that.

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 Post subject: Re: oily intake
PostPosted: Mon Sep 22, 2014 8:43 am 
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The oil was under the plenum, if you are standing in front of the car, the oil was in the upper left corner of the manifold down in that pocket where the bolt is. Well, I might be pulling the plenum off soon, rats


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 Post subject: Re: oily intake
PostPosted: Mon Sep 22, 2014 8:45 am 
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Forgot to say thanks for the help all


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 Post subject: Re: oily intake
PostPosted: Mon Sep 22, 2014 7:52 pm 
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nos4blood70 wrote:
What you described in the LIM is actually normal. In any case, if the UIM has never been replaced it might be time to do so. The three holes by where the throttle body attaches serve as the throttle body coolant loop and the spot where the EGR gasses come back into the intake. The hot EGR gasses eventually make the little pipe hot enough to deteriorate the plastic UIM which lets the coolant from the throttle body coolant loop leak in. I just blocked the loop by JB welding a pair of dimes in the LIM.
when you weld in the dimes, what does that change as far as the way the engine runs?


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 Post subject: Re: oily intake
PostPosted: Mon Sep 22, 2014 10:39 pm 
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It doesn't change anything. The throttle body doesn't get coolant flowing through it.

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 Post subject: Re: oily intake
PostPosted: Tue Sep 23, 2014 8:51 am 
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nos4blood70 wrote:
It doesn't change anything. The throttle body doesn't get coolant flowing through it.

And that doesn't matter?


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 Post subject: Re: oily intake
PostPosted: Tue Sep 23, 2014 1:41 pm 
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It's supposed to prevent the TB from icing over... LOL Okay GM.

Mine have been blocked for just over 2 years, never had issues with it even on the coldest of days. The Grand Prix guys do it too. I got the idea from a certain wise old 3800 guru named Billboost.

You can also drill and tap the coolant ports if you feel like spending more than 20 cents. Hahaha!

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 Post subject: Re: oily intake
PostPosted: Tue Sep 23, 2014 6:44 pm 
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nos4blood70 wrote:
It's supposed to prevent the TB from icing over... LOL Okay GM.

Mine have been blocked for just over 2 years, never had issues with it even on the coldest of days. The Grand Prix guys do it too. I got the idea from a certain wise old 3800 guru named Billboost.

You can also drill and tap the coolant ports if you feel like spending more than 20 cents. Hahaha!


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 Post subject: Re: oily intake
PostPosted: Tue Sep 23, 2014 10:09 pm 
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The UIM can look fine in that area, but any pinholes or anything can lose a lot of coolant. Did you replace the UIM, or just inspect it and re-install the old one? Even the plastic being soft is enough for it to leak. A sharp pick or nail should be used to see if you can poke through the EGR pass-through area.

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 Post subject: Re: oily intake
PostPosted: Mon Sep 29, 2014 7:07 am 
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00Beast wrote:
The UIM can look fine in that area, but any pinholes or anything can lose a lot of coolant. Did you replace the UIM, or just inspect it and re-install the old one? Even the plastic being soft is enough for it to leak. A sharp pick or nail should be used to see if you can poke through the EGR pass-through area.

I replaced the UIM gasket, I bought the whole kit from Rockauto a few years ago when we bought the car, figured it would need changed sometime. Well it's not eating coolant and the temp gauge stays steady, which it wasn't before. Hope I make it for a while or it will need changing when its minus 20 this winter


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