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Old 08-28-2006, 12:49 PM   #1
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Default series 1 differences

I have read that series 1 doesn't have the intake gasket problem like series 2 does, correct? I have noticed that the sereis one also has differences in aluminum and plastic intakes? Also Some have EGR valves and others didn't. Just trying to understand everything about series 1 because thats what I have, and mine is an aluminum intake with no egr. Was there a reason they changed intakes, and what about the ignition, I know some have magnavox and others have the delco.
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Old 08-28-2006, 01:19 PM   #2
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The one in your car has a metal manifold, therefore it has no EGR as you've said.

The ignition systems changed over near the time the manifold did, but there are some that have metal and the new ignition.

The Issue with the series II is not the gasket it'* the manifold design itself. Original designes placed a coolant passage VERY close to the EGR "stove pipe." The EGR pipe is very large in the hole for it, so it transfers a lot of heat, and eventually the plastic degrades near the coolant passage and it pours into the motor. This is NOT an issue with series I.

Series I need to worry about trans cooler on some 93'*, plastic coolant elbows into the LIM, and the wear and tear that comes with a 12+ year old motor.
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Old 08-28-2006, 02:00 PM   #3
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Quote:
Originally Posted by BonneMeMN
The one in your car has a metal manifold, therefore it has no EGR as you've said.

The ignition systems changed over near the time the manifold did, but there are some that have metal and the new ignition.

The Issue with the series II is not the gasket it'* the manifold design itself. Original designes placed a coolant passage VERY close to the EGR "stove pipe." The EGR pipe is very large in the hole for it, so it transfers a lot of heat, and eventually the plastic degrades near the coolant passage and it pours into the motor. This is NOT an issue with series I.

Series I need to worry about trans cooler on some 93'*, plastic coolant elbows into the LIM, and the wear and tear that comes with a 12+ year old motor.
Thanks for the info, I personally like the series 1, my old man has a series 3 in his grand prix and I like the way the older motor sounds, and the low end torque, plus the drive by wire is weird IMO.
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Old 08-28-2006, 07:08 PM   #4
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the series 3 is quite different than what i am used to but it isnt bad, it gets up and goes pretty good, but ya the driving with no throttle cable is very different than what i am used to
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Old 08-28-2006, 07:50 PM   #5
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Series One'* do have issues with upper and lower intake manifold gaskets.

for the series one L27 (non supercharged) its the upper intake manifold gasket. these seem to leak externally.

for the series one L67 (supercharged) its the lower intake manifold gasket, the one on my car has been replaced twice, last ssei had this fail and pretty much killed the motor. water in cylinders etc. Pretty sure most the time these leak internally.

As mentioned the non supercharged series II L36 has issues with the design where the EGR stovepipe enters the intake manifold. (hot exhaust gases into plastic with no insulation = bad idea)

I've never owned a series II l67 so dont know much about the LIM gaskets in those
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Old 08-29-2006, 08:46 AM   #6
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Quote:
Originally Posted by Hans
Series One'* do have issues with upper and lower intake manifold gaskets.

for the series one L27 (non supercharged) its the upper intake manifold gasket. these seem to leak externally.

for the series one L67 (supercharged) its the lower intake manifold gasket, the one on my car has been replaced twice, last ssei had this fail and pretty much killed the motor. water in cylinders etc. Pretty sure most the time these leak internally.

As mentioned the non supercharged series II L36 has issues with the design where the EGR stovepipe enters the intake manifold. (hot exhaust gases into plastic with no insulation = bad idea)

I've never owned a series II l67 so dont know much about the LIM gaskets in those
Thats great info. I have a series 1 and I am looking to correct all the major problems, even if they haven't happened yet, I want to make sure that they dont. I am also waiting to hear about a car that looks just like yours, supercharged SSE and I know nothing about supercharged cars, I know that there internals are different than the NA'*, but thats about it.....
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Old 08-29-2006, 09:52 AM   #7
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Series 1 gaskets on the LIM don't become a problem until you're beyond 100k. That'* typical lifetime.

I'd hardly call that a common problem.
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Old 08-29-2006, 10:59 AM   #8
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Quote:
Originally Posted by willwren
Series 1 gaskets on the LIM don't become a problem until you're beyond 100k. That'* typical lifetime.

I'd hardly call that a common problem.
Well my car has 119K on it now, and I want to know what i can do to head problems off at the pass.........
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Old 08-29-2006, 11:30 AM   #9
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I'd venture the series I is not even 1% of the failures of LIM in the L36.

There are ways to fix it though! Check out the 92-99 section for more then you care to know about it
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Old 08-29-2006, 12:02 PM   #10
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Quote:
Originally Posted by willwren
Series 1 gaskets on the LIM don't become a problem until you're beyond 100k. That'* typical lifetime.

I'd hardly call that a common problem.
Agreed. Mine will have to be done soon but not a major issue. Just did the upper June 8th. No problems. My car has 133k right now.
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