S1 with a leaking upper intake?? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 05-04-2006, 02:21 AM   #1
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Default S1 with a leaking upper intake??

This stumped me when I was doing my lower intake gaskets. Check out intake runner #1:

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To me, that looks like runner #1 has been sucking down coolant. But that doesn't make any sense to me, seeing as i've never seen nor heard of a S1 upper plenum leaking coolant. So the question I pose to you is: what the heck is with the color and lack of carbon in runner #1??

One thing to throw into the mix, the throttle body looked like it had been swallowing a lot of oil, which i can only assume came from possible over-oiling of my K&N.

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So if I had been ingesting large quantities of K&N filter oil, and for some reason it was going into onlycylinder #1 runner, shouldn't that cause excessive carbon versus no carbon?? Hence the reason I do not believe that over-oiling can be attributed to this lower intake. So why the strange intake runner???
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Old 05-04-2006, 02:23 AM   #2
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Is that a coolant port right next to the left runner? Maybe that leaked into it?
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Old 05-04-2006, 02:25 AM   #3
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Nope, that'* the PCV port.
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Old 05-04-2006, 02:36 AM   #4
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My l27 currntly has what I belive is strictly an external leak but may be leaking interally, however not enough to matter at this point.
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Old 05-04-2006, 02:40 AM   #5
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I've never had the */C off of an l27 to know how those two upper intakes differ (other than the obvious, like the swirling fins and the whoosh noise). I'll need someone else to chime in on how possible this is. I don't see it as possible, because the only place coolant flows in the S1 upper intake is around the throttle body, through the two ports you see on the right side of my lower intake.
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Old 05-04-2006, 02:40 AM   #6
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I can't really see how it would be missing all the other ports unless the LIM gasket went. A waterjacket may be leaking to the port then.
And too much of that K&N oil will kill the maf sensor.
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Old 05-04-2006, 02:48 AM   #7
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And the LIM gasket, even at 256K, looked great. No tears, leaks, soft spots...nothing.

Here'* the LIM at port #1. For whatever good it might do to somebody.

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Old 05-04-2006, 08:57 AM   #8
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Quote:
Originally Posted by CSFiend
And the LIM gasket, even at 256K, looked great. No tears, leaks, soft spots...nothing.

Here'* the LIM at port #1. For whatever good it might do to somebody.

Wow that baby looks like she missed a oil change or two...

Is that a L motor??????????????

Whats the UIM look like on that cyl.??????????????????
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Old 05-04-2006, 09:04 AM   #9
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Quote:
Originally Posted by CSFiend
I've never had the */C off of an l27 to know how those two upper intakes differ (other than the obvious, like the swirling fins and the whoosh noise). I'll need someone else to chime in on how possible this is. I don't see it as possible, because the only place coolant flows in the S1 upper intake is around the throttle body, through the two ports you see on the right side of my lower intake.
He said L TWENTY seven. Not SIXTY seven. Hans has a non-supercharged car also.

Your pics sure look like coolant injestion to me.
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Old 05-04-2006, 02:02 PM   #10
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But from where??

And all this L67 and L27 crap has always confused me anyways. I can't tell one from the other.
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