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Old 06-30-2005, 05:04 PM   #1
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Default Newer 3.1s - Reliable?

There'* a '97 Olds Supreme Coupe in the local bargain trader with only 77k miles for cheap. Those would have a 3.1 in them, right? I'm aware of the performance traits (mediocre, but similar, given weight differences and all, to my N/A '93 Bonne) but I'm concerned with reliability. I've heard they're reliable, but are we talking as rock-solid reliable as my Series I 3800 in my Bonne reliable? Or do they suffer from problems like the Series II 3800s? Some help and guidance here is appreciated. Thanks!
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Old 06-30-2005, 05:34 PM   #2
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The 3100'* are very reliable.... I have seen them with as many as 200,000 miles....

One of the problems that they will encounter is a leaky intake gasket/*.... This is a common problem on all 3100 engines... Its usually a safe bet to have them replaced at 100k...

If you do this yourself, the only think I do not like is that helicoils are used in the head to hold the rocker in place.... I have seen very few ever have a problem in that department tho....

All in all its a good reliable engine... I'd have one....

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Old 06-30-2005, 05:55 PM   #3
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i had one in my buick century.. granted, i beat the hell out of it.. but mine needed an intake gasket, head gasket, waterpump, and had a nice lifter-rap at about 75k miles..

About the head bolts.. i was pretty sure that there wasnt heli-coils, but they used bolts made out of a spring steel that couldnt or atleast shouldnt be reused?? But replaced instead.. i could be wrong
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Old 06-30-2005, 06:52 PM   #4
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As long as there isn't the 3.4 DOHC in that Cutty you're golden. I'm not sure when they stopped making that 3.4, maybe they stopped by 97, but the 3100 is good. I drove mine hard for 10 months until I sold it, and it had not one single problem mechanically. Of course I had 48K miles on it when I got it too. The 3.33 gearing was fun too!
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Old 06-30-2005, 07:42 PM   #5
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Good motor until the intake gaskets (or other assorted common issues) take a ****.


Address those (they aren't ridiculously expensive) and you'll be good for many miles.
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Old 06-30-2005, 08:09 PM   #6
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didnt sseimatt have one of these cars for like a day before it broke for good?
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Old 06-30-2005, 08:21 PM   #7
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Quote:
Originally Posted by SSsuperchargedEi
didnt sseimatt have one of these cars for like a day before it broke for good?
He had the 3.4 DOHC. Sad thing is, I felt there would be some form of serious mechanical trouble coming even before he bought the car.


But THAT soon and THAT serious?
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Old 06-30-2005, 10:33 PM   #8
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Quote:
Originally Posted by repinS
Quote:
Originally Posted by SSsuperchargedEi
didnt sseimatt have one of these cars for like a day before it broke for good?
He had the 3.4 DOHC. Sad thing is, I felt there would be some form of serious mechanical trouble coming even before he bought the car.


But THAT soon and THAT serious?
Yeah that 3.4 was a problem engine, and I'm sure I don't know that half of it. He also had trouble with his other 3.4 (3400). He got some bad luck for a while. Good thing he has that nice Bonne now
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Old 07-01-2005, 02:17 AM   #9
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Good, everyone thus far is confirming what I already thought, hehe Now, all that remains is finding the time to go look at the damn thing...

Thanks again, guys
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Old 07-01-2005, 02:20 AM   #10
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Oh yeah, BTW, it can't have the 3.4. I read on Consumer Guide'* write-up on it that they discontinued the 3.4 in '97. Yeah !
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