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Old 10-05-2005, 02:27 PM   #21
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Quote:
Originally Posted by kevo
My wife has a '99 century. It burns oil, and I think that there is some hairpin hole or something 'cause the dexcool goes down slowly, but isn't in the oil.

I only have maybe 70K or so on it too....
uh oh.... still could be that damn gasket that goes on that motor right guys?
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Old 10-05-2005, 02:43 PM   #22
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Quote:
Originally Posted by DarkShadow
Quote:
Originally Posted by kevo
My wife has a '99 century. It burns oil, and I think that there is some hairpin hole or something 'cause the dexcool goes down slowly, but isn't in the oil.

I only have maybe 70K or so on it too....
uh oh.... still could be that damn gasket that goes on that motor right guys?
Yeah that bothers me... 99... Is that a Vin J or Vin M 3100?

In any event, start look for an external leak, Radiator, water pump and all of the various hoses that the 3100 has all over the place... If you find no leaks start looking in the area where the lower intake and the heads meet... These gaskets usually tend to leak at the corners, could be any of the 4 corners... Let us know what you find..

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Old 10-07-2005, 01:53 PM   #23
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Quote:
Originally Posted by jr's3800
Quote:
Originally Posted by DarkShadow
Quote:
Originally Posted by kevo
My wife has a '99 century. It burns oil, and I think that there is some hairpin hole or something 'cause the dexcool goes down slowly, but isn't in the oil.

I only have maybe 70K or so on it too....
uh oh.... still could be that damn gasket that goes on that motor right guys?
Yeah that bothers me... 99... Is that a Vin J or Vin M 3100?

In any event, start look for an external leak, Radiator, water pump and all of the various hoses that the 3100 has all over the place... If you find no leaks start looking in the area where the lower intake and the heads meet... These gaskets usually tend to leak at the corners, could be any of the 4 corners... Let us know what you find..
I know this may sound like a real n00b question, but how do I find out which vin it is?
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Old 10-07-2005, 01:58 PM   #24
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8th didget of the Vin Numer will be the engine code... Your'* will be a Vin M or J...

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Old 10-07-2005, 03:23 PM   #25
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For those with leaky DexCools: Have you ever tried to put in the GM supplemental tablets to seal the colling system of any leaks? Or an equivalent leak stopper from Autozone? Because thats what you have to use on some cars like the Northstar based engines which use Dexcool.
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Old 10-07-2005, 04:00 PM   #26
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Quote:
Originally Posted by Boreas
For those with leaky DexCools: Have you ever tried to put in the GM supplemental tablets to seal the colling system of any leaks? Or an equivalent leak stopper from Autozone? Because thats what you have to use on some cars like the Northstar based engines which use Dexcool.
Thats true, Some GM emgines do use that supplement.... But its not required on the 3100'* 3400'* or the Buick 3800 series engines... At best it would be a very temporary fix as the gaskets are degraded and will only spring a diffrent leak... On these engines its very important that the gaskets be replaced..

*edit*

On some of the later 3800 engines GM used the Tablets to help seal the throttlebody from leaks...

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Old 10-07-2005, 06:29 PM   #27
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You have to be careful of the seal tabs...only a few will do, otherwise they can plug up an aluminum heater core like nothing else!

As far as the 60 degree V6'*...they have a BAD rap for all the intakes puking out (as you all well should know) ...I know of a few GM people who went elsewhere because of such. Sad situation, and IMO it hurt GM'* image overall.

Oh well, at least they bring help work into my shop!
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Old 10-07-2005, 11:43 PM   #28
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Yes the intakes on these are TERRIBLE. Kind of like the SII 3800'*. My dad has a 1996 Cutlass Ciera, beautiful condition, we bought it a little over a year ago with 36k actual miles on it. That'* right: 36,000 miles on a 1996. 5100/year. But she'd just had the engine replaced 6k previous (around 30k). Exact problem, intake leaked BAD, burned all coolant, warped heads. Obviously this was worst case. But other than that his car goes pretty good for a boat. Some day i'll get pics up here of it.
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Old 10-08-2005, 01:35 AM   #29
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Quote:
Originally Posted by alec_b
Yes the intakes on these are TERRIBLE. Kind of like the SII 3800'*. My dad has a 1996 Cutlass Ciera, beautiful condition, we bought it a little over a year ago with 36k actual miles on it. That'* right: 36,000 miles on a 1996. 5100/year. But she'd just had the engine replaced 6k previous (around 30k). Exact problem, intake leaked BAD, burned all coolant, warped heads. Obviously this was worst case. But other than that his car goes pretty good for a boat. Some day i'll get pics up here of it.
in 96 it was just the Oldsmobile Ciera, cutlass was dropped in that line after 95

good cars tho
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Old 10-08-2005, 04:56 AM   #30
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Quote:
Originally Posted by kevo
My wife has a '99 century. It burns oil, and I think that there is some hairpin hole or something 'cause the dexcool goes down slowly, but isn't in the oil.

I only have maybe 70K or so on it too....
ahhh the notorious faulty 60 degree v6 intake gasket strikes again. This plaques almost all 3400'* and some 3100'* mainly 99 and up. However taken care of, the 3100 can be a high mileage motor easily.
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