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#2386487 - 09/24/11 11:42 AM GM 3.4L V6?
renegade_987 Offline


Registered: 04/07/11
Posts: 1563
Loc: Ankeny, IA
Mu uncle just adopted a Monte Carlo (2001) with this engine. I have ZERO experiance with it, is it any good? I know it has a similar engine to the Grand AM. Thing is, it has 175K on her so I'm not sure how they hold up. Opinions welcome! TIA
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#2386494 - 09/24/11 11:54 AM Re: GM 3.4L V6? [Re: renegade_987]
pbm Offline


Registered: 04/19/04
Posts: 7692
Loc: New York
It's a bored out 3.1 60* V6.
They were prone to intake-manifold gasket failures.
If the gasket is replaced with a Fel-Pro Problem Solver they are capable of high mileage. (I have seen several on here with over 300K and one owner claimed 800K...although he claimed they need an I-M gasket every 200K regardless ....)
They are also economical if not powerful. I have gotten well over 30mpg highway with my 3.1 on long trips.


Edited by pbm (09/24/11 12:00 PM)
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#2386496 - 09/24/11 11:57 AM Re: GM 3.4L V6? [Re: pbm]
daves87rs Offline


Registered: 02/23/09
Posts: 17034
Loc: Michigan
Originally Posted By: pbm
It's a stroked (or maybe bored out) 3.1 60* V6.
They were prone to intake-manifold gasket failures.
If the gasket is replaced with a Fel-Pro Problem Solver they are capable of high mileage. (I have seen several on here with over 300K and one owner claimed 800K...although he claimed they need an I-M gasket every 200K regardless ....)
They are also economical if not powerful. I have gotten well over 30mpg highway with my 3.1 on long trips.



This....
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#2386497 - 09/24/11 11:57 AM Re: GM 3.4L V6? [Re: renegade_987]
eljefino Offline


Registered: 06/15/03
Posts: 32882
Loc: ME
I liked mine in my silhouette. It was noisy when cold but torquey and got 26 MPG going extra legal speeds with the AC on and a van full of stuff. It matches the 4 speed auto they stick beside it perfectly.

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#2386503 - 09/24/11 12:01 PM Re: GM 3.4L V6? [Re: renegade_987]
beechcraftted Offline


Registered: 12/15/06
Posts: 120
Loc: Milwaukee, WI.
The GM 3.4 is a very study engine except for one thing: the lower intake manifold gaskets. Commonly referred to as the LIM. At that mileage, I'm sure they've been replaced at least once. If the repair was done with Fel-Pro gaskets, you'll never have to do it again. If you keep coolant out of the oil, these engines have been able to top 250 K pretty easily. They are also known for some clatter/tick upon cold start. This generally goes away within 30 seconds. Most just ignore it, it is a trait of this engine and fades with warmup. I use HDEO 15W40 in the summer and the recommended 5W-30 in the winter.
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#2386508 - 09/24/11 12:05 PM Re: GM 3.4L V6? [Re: renegade_987]
pbm Offline


Registered: 04/19/04
Posts: 7692
Loc: New York
...I should have added to tell your uncle keep his eyes on the coolant tank level as loss of coolant is the main sign of I-M leakage. It might be wise to throw a bottle of Barsleaks in it until you ascertain whether it's leaking.
It's not a matter of 'if' it will leak but rather of 'when'....

Mechanics are familiar with the job and many will do it for less than $600...(maybe even less in Iowa)..
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#2386540 - 09/24/11 12:47 PM Re: GM 3.4L V6? [Re: pbm]
Cressida Offline


Registered: 10/16/02
Posts: 480
Loc: Joplin
If you have no records that the LIM gasket has already been replaced then I would do an oil analysis to see how much coolant is in the oil.

You can not see the coolant in the oil so you are wasting your time doing a visual on the oil. The lab called me back with the bad news.

Some of these engines (including mine) also have had problems with head gaskets but that may be related to the LIM and Dexcool.

I changed the coolant to G-05 after doing the LIM twice and the heads.


Edited by Cressida (09/24/11 12:48 PM)

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#2386562 - 09/24/11 01:08 PM Re: GM 3.4L V6? [Re: renegade_987]
EricF Offline


Registered: 07/14/09
Posts: 1645
Loc: SF Bay Area
the factory LIM gasket is plastic which the dexcool's 2-EHA eats up over time. So felpro's updated gasket solves the issue.
these motors have a lot of oomph as well as reliability (aside from the intake gasket)
They're relatively easy to work on too.
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#2389663 - 09/27/11 06:15 PM Re: GM 3.4L V6? [Re: EricF]
ridgerunner Offline


Registered: 01/14/09
Posts: 813
Loc: PA


My wife's grand am has had a steady diet of 1985 10-40 oil lately without complaint. Gotta be a tough engine!

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#2389729 - 09/27/11 07:04 PM Re: GM 3.4L V6? [Re: ridgerunner]
caravanmike Offline


Registered: 05/09/09
Posts: 1075
Loc: ohio
Originally Posted By: ridgerunner


My wife's grand am has had a steady diet of 1985 10-40 oil lately without complaint. Gotta be a tough engine!

lol
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#2389867 - 09/27/11 09:17 PM Re: GM 3.4L V6? [Re: renegade_987]
sciphi Offline


Registered: 03/24/07
Posts: 10008
Loc: Upstate NY
They're one tough engine. There are two 3400's in older GM minivans that are still running okay despite lifetimes of indifferent at best maintenance. They sound like death warmed over when first started, but they go and get mid-20's fuel economy.

In a lighter Monte Carlo, they should be capable of 30+ mpg highway when driven sensibly.
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#2389952 - 09/28/11 05:29 AM Re: GM 3.4L V6? [Re: renegade_987]
SteveSRT8 Offline


Registered: 10/10/08
Posts: 19034
Loc: Sunny Florida
I agree. This motor is proof that the much ballyhooed "piston slap" issue is the biggest non-problem in history!
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#2390134 - 09/28/11 10:17 AM Re: GM 3.4L V6? [Re: renegade_987]
artificialist Offline


Registered: 09/23/07
Posts: 8598
Loc: Florida
I have replaced head gaskets often on this engine.

I don't like the 2.8/3.1/3.4 engines.
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#2390144 - 09/28/11 10:26 AM Re: GM 3.4L V6? [Re: artificialist]
cchase Offline


Registered: 11/03/09
Posts: 4021
Loc: New England
Originally Posted By: artificialist
I have replaced head gaskets often on this engine.

I don't like the 2.8/3.1/3.4 engines.


I hear this often - and wonder whether there is a connection between head gasket failure and a previous LIM gasket failure resulting in an overheating condition and subsequently compromised head gasket...

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#2390201 - 09/28/11 11:37 AM Re: GM 3.4L V6? [Re: renegade_987]
SteveSRT8 Offline


Registered: 10/10/08
Posts: 19034
Loc: Sunny Florida
Yet it's actually a relatively small amount of the engines produced that require new LIM and/or head gaskets.

Fel Pro Problem Solver (hint).
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