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GM 3.4L V6? #2386487
09/24/11 11:42 AM
09/24/11 11:42 AM
Joined: Apr 2011
Posts: 1,563
Ankeny, IA
renegade_987 Offline OP
renegade_987  Offline OP
Joined: Apr 2011
Posts: 1,563
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


2015 VW Jetta 1.8t - Pennzoil Euro/VW OEM
2004 F150 - Valvoline WB/Motorcraft
2008 HHR - Mobil 1 / WIX
2005 500 - Citgo Synthetic/Fram XG

Re: GM 3.4L V6? [Re: renegade_987] #2386494
09/24/11 11:54 AM
09/24/11 11:54 AM
Joined: Apr 2004
Posts: 7,757
New York
pbm Offline
pbm  Offline
Joined: Apr 2004
Posts: 7,757
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.

Last edited by pbm; 09/24/11 12:00 PM.

'Journalism is Dead'
Re: GM 3.4L V6? [Re: pbm] #2386496
09/24/11 11:57 AM
09/24/11 11:57 AM
Joined: Feb 2009
Posts: 17,211
Michigan
daves87rs Offline
daves87rs  Offline
Joined: Feb 2009
Posts: 17,211
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....


Coming together is a beginning; keeping together is progress; working together is success.

Henry Ford
Re: GM 3.4L V6? [Re: renegade_987] #2386497
09/24/11 11:57 AM
09/24/11 11:57 AM
Joined: Jun 2003
Posts: 33,252
ME
eljefino Offline
eljefino  Offline
Joined: Jun 2003
Posts: 33,252
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.

Re: GM 3.4L V6? [Re: renegade_987] #2386503
09/24/11 12:01 PM
09/24/11 12:01 PM
Joined: Dec 2006
Posts: 121
Milwaukee, WI.
beechcraftted Offline
beechcraftted  Offline
Joined: Dec 2006
Posts: 121
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.


'66 Chevelle 496 big block
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Re: GM 3.4L V6? [Re: renegade_987] #2386508
09/24/11 12:05 PM
09/24/11 12:05 PM
Joined: Apr 2004
Posts: 7,757
New York
pbm Offline
pbm  Offline
Joined: Apr 2004
Posts: 7,757
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)..


'Journalism is Dead'
Re: GM 3.4L V6? [Re: pbm] #2386540
09/24/11 12:47 PM
09/24/11 12:47 PM
Joined: Oct 2002
Posts: 490
Joplin
Cressida Offline
Cressida  Offline
Joined: Oct 2002
Posts: 490
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.

Last edited by Cressida; 09/24/11 12:48 PM.
Re: GM 3.4L V6? [Re: renegade_987] #2386562
09/24/11 01:08 PM
09/24/11 01:08 PM
Joined: Jul 2009
Posts: 1,645
SF Bay Area
EricF Offline
EricF  Offline
Joined: Jul 2009
Posts: 1,645
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.


1993 Ford Ranger XLT 4.0L 4x4 (240k) 5W-30 Synpower
2006 Saturn Relay-3 3.5L (85k) 5W-30 Synpower
2012 Ford Fusion SE 2.5L (39k) 5W20 M/C Semi Syn
Re: GM 3.4L V6? [Re: EricF] #2389663
09/27/11 06:15 PM
09/27/11 06:15 PM
Joined: Jan 2009
Posts: 831
PA
ridgerunner Offline
ridgerunner  Offline
Joined: Jan 2009
Posts: 831
PA


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

Re: GM 3.4L V6? [Re: ridgerunner] #2389729
09/27/11 07:04 PM
09/27/11 07:04 PM
Joined: May 2009
Posts: 1,081
ohio
caravanmike Offline
caravanmike  Offline
Joined: May 2009
Posts: 1,081
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


Oils I use: Any 5w-30,5w-20 conventional

Re: GM 3.4L V6? [Re: renegade_987] #2389867
09/27/11 09:17 PM
09/27/11 09:17 PM
Joined: Mar 2007
Posts: 10,008
Upstate NY
sciphi Offline
sciphi  Offline
Joined: Mar 2007
Posts: 10,008
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.


2013 Toyota RAV4 XLE
2012 Chevrolet Cruze Eco
Re: GM 3.4L V6? [Re: renegade_987] #2389952
09/28/11 05:29 AM
09/28/11 05:29 AM
Joined: Oct 2008
Posts: 19,133
Sunny Florida
SteveSRT8 Offline
SteveSRT8  Offline
Joined: Oct 2008
Posts: 19,133
Sunny Florida
I agree. This motor is proof that the much ballyhooed "piston slap" issue is the biggest non-problem in history!


"In a democracy, dissent is an act of faith."
J. William Fulbright
Best ET-12.79 @ 111 mph
4340 pounds, Street tires
Just like we go to Publix
Re: GM 3.4L V6? [Re: renegade_987] #2390134
09/28/11 10:17 AM
09/28/11 10:17 AM
Joined: Sep 2007
Posts: 8,598
Florida
artificialist Offline
artificialist  Offline
Joined: Sep 2007
Posts: 8,598
Florida
I have replaced head gaskets often on this engine.

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


2010 Lancer Ralliart Sportback
Re: GM 3.4L V6? [Re: artificialist] #2390144
09/28/11 10:26 AM
09/28/11 10:26 AM
Joined: Nov 2009
Posts: 4,021
New England
cchase Offline
cchase  Offline
Joined: Nov 2009
Posts: 4,021
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...

Re: GM 3.4L V6? [Re: renegade_987] #2390201
09/28/11 11:37 AM
09/28/11 11:37 AM
Joined: Oct 2008
Posts: 19,133
Sunny Florida
SteveSRT8 Offline
SteveSRT8  Offline
Joined: Oct 2008
Posts: 19,133
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).


"In a democracy, dissent is an act of faith."
J. William Fulbright
Best ET-12.79 @ 111 mph
4340 pounds, Street tires
Just like we go to Publix
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