Serie I Intake leaks - Page 3 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 11-11-2003, 10:14 PM   #21
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Default Re: oddity

Quote:
Originally Posted by stevej94
Oh, great! I'm an oddity now.
OK, got my list and checking it twice at the dealer tomorrow:
Upper Intake manifold gasket kit
Throttle Body seal
Plastic Elbow (for what I'm not sure)
Lower intake manifold gasket set
180 degree thermostat, gasket and o-ring
Fuel injector o-rings (what the heck)
valve cover gaskets (while I'm at it)
degreaser
high temp red paint (for upper manifold and valve covers)
Boulevard Wheat Ale

Yeah, think I got it
Upr Int >>>> not the problem
TB seal >>>> Possible coolant leak there.
Plastic Elbow >>>> Goes from Lwr Int to Water pump on Series I & To Tensioner on Series II'* & both engines are known for leaking coolant there.
Lwr Int >>> probably the real leak
Valve Cvrs >>>> leak oil only & are common leaks.
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Old 11-12-2003, 04:38 PM   #22
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Default the job

OK, got the parts. Will hopefully get to it sometime this weekend. I suspect internet wagering is illegal but it will be interesting to see who is right about what is leaking. I will take pictures. I think the coolant is coming from the upper intake seal on the front side of the engine (not the throttle body side) and the oil burning is caused by bad valve seals.
And yes, some of us like our beer a little cloudy.
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Old 11-12-2003, 09:24 PM   #23
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We drink the same beer, and we suspect the same problem. I don't see you going into the heads at all.
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Old 11-12-2003, 10:11 PM   #24
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i did an intake gasket on a 2000 blazer with a 4.3 in it today. it has the same gaskets, (plastic with rubber inserts) , it was leaking at the top of the gasket. the front DS water port from the head to the intake was cracked. the plastic was falling apart.
i still have it sitting on my roll cart at work, ill bring it home tomorrow and take some pics and post them ok. it was a hard leak to spot, hidden behind the water pump and the a/c compressor. it would evap before it ever dripped. complaint was interm. no heat.
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Old 11-13-2003, 02:13 AM   #25
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Damn. That would be a tough one to spot for intermittent no heat. Good catch!
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Old 11-13-2003, 09:20 PM   #26
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told ya i would post a pic of a bad intake gasket. this is the one from the 2000 S10 blazer
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Old 11-14-2003, 11:55 PM   #27
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Default pulled manifolds this evening

I pulled the manifolds this evening. I cleaned the engine before I started and noticed some fresh coolant leaking from the lower intake where it meet the front cylinder head. Pretty clear the upper was not leaking. The lower gaskets were what was going bad.
I posted some pictures in myyahoo gallery. It looks like they were leaking oil also. Hopefully this will clear up my oil burning problem.

see pictures at
http://photos.yahoo.com/[email protected]
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Old 11-15-2003, 02:17 AM   #28
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Exactly what I expected. I just got a pic from Jseabert from his teardown, but I guess you don't need convincing now Were your new seals blue or black?

Notice your #1 runner? That'* an indication of a water leak. You replaced the upper seal anyway, right?
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Old 11-15-2003, 05:25 PM   #29
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Default intake

Is the leak on the #1 runner evidenced by the fact that it is cleaner than all the others? The new gaskets are black with red seals.
The old ones were soaked with coolant and oil. Quite messy. I hope to put it all back together on Monday. Hopefully it will cure my smoking and mild drivabilty problems.
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