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    Thread: WORST V6 Engines Ever Made.....

    1. Geriatric Member BRealistic's Avatar
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      08-10-2012 10:09 AM #26
      Most v6 issues tend to be accessibility in engine bay.
      The most hated were the ones in transverse applications where the back head was crammed up against the firewall, making just a spark plug change impossible.

      As far as just bad v6s..


      Ford sold some hodge podge European market sourced 2.8 v6 in the Ranger for one year in the 80s due to an engine shortage.
      I know somebody that had one - it was weak, thirsty, and unreliable. A carb'd 302 swap would have improved the fuel economy. Seriously.
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      08-10-2012 10:13 AM #27
      Quote Originally Posted by OldsPowered View Post
      BEHOLD! The Olds 4.3L diesel!
      Honestly, this is probably the winner. No V6 singlehandedly killed an entire market like this one did. This was the copper-cooled of the Diesel world.
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      08-10-2012 10:25 AM #28
      3.1L V6 in a 3rd Gen Camaro

      Quote Originally Posted by TrillyPop View Post
      The 2.5L forum is full of high hopes and huge disappointment.
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      08-10-2012 10:31 AM #29
      3.1 and 3.4 efi motors in most gm cars. (grand am, malibu, impala) they always blew lower intake manifold gaskets.
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      08-10-2012 11:01 AM #30
      My vote goes to the GM 3.4L V6. Garbage. Eats head gaskets/lower intake manifold gaskets. I've replaced them on a few of these engines and it's a bitch, the engines suck to work on.

      Here is a video I took the other night of our 99 Grand Am GT with 170,000kms on it. It's getting scrapped. Way too much water in the oil, it'd likely just toss a crank bearing in a couple weeks if I bothered to replace the gaskets. Sick of tossing money at it so it's being parted out.


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      08-10-2012 11:11 AM #31
      I agree 100% about the Toyota 3.0 V6. What a POS. Luckily they replaced it with the 3.4, one of the best Toyota engines ever made.

      From personal experience, the GM 2.8l V6 was the worst to drive but held up for years with a collapsed lifter.

    7. Member MK5golf's Avatar
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      08-10-2012 11:13 AM #32
      Another vote for the gm v6s actually. I once almost made the mistake of buying a Grand Am v6... it was leaking (head gasket) and sounded weird
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    8. 08-10-2012 11:23 AM #33


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    9. Member seminole_kev's Avatar
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      08-10-2012 11:31 AM #34
      I'll echo the 2.8 L Chevy V6 used in the mid 80's. What a lump of crap that motor was.

      Now, when we get to V8's, I'm reserving a spot for the mid-80's Cadillac 4.1 L V8...

      Kind of think of it. What the hell was GM doing with their engines in the early-to-mid 80's?

    10. 08-10-2012 11:33 AM #35
      Duck and run...

      The 80s GM 2.8l V6 may have been the worst SOUNDING engine. It was "tuned" but ended up sounding like it was gargling.

    11. Member Broduski's Avatar
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      08-10-2012 11:58 AM #36
      Quote Originally Posted by tjl View Post
      The Peugeot - Renault - Volvo V6 engine was not known for durability. It is why old Volvo 260-series cars are very rare compared to 240-series cars which used the durable "red block" 4 cylinder engines.

      /thread. We're done here.
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      08-10-2012 11:58 AM #37
      Quote Originally Posted by benjaminobscene View Post



      Came for this exact post; leaving satisfied.

    13. 08-10-2012 12:06 PM #38
      Quote Originally Posted by Egz View Post
      I'll see your Sebring, and raise you a K-car. The 3.0 Pentastar engine, with the valve guides made out of wax.
      That engine is/was not called the Pentastar; you're thinking of Chrysler's current 3.6L DOHC V6.

      And speaking of Chrysler, they didn't make the 3.0L you mentioned--it's a Mitsubishi engine. While I'm no fan, but I will be honest: if you rebuild the heads and installed better valve guides, it's actually an acceptably decent engine.
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      08-10-2012 12:13 PM #39
      The Duratec V6 used in Contours/Mystiques.

    15. 08-10-2012 12:22 PM #40
      Quote Originally Posted by 1985Jetta View Post
      The Duratec V6 used in Contours/Mystiques.
      On what grounds?

      THat actually is a pretty decent engine.
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    16. 08-10-2012 12:26 PM #41
      yes, it has been mentioned in here, but this engine really deserves a giant trophy made of poop and dongs.

      Quote Originally Posted by wiki
      The longitudinal LR2 was a truck version ("B-code") produced from 1982 to 1990. It used a 2-barrel carburetor and produced 115 hp (86 kW) and 150 lb·ft (203 N·m). This engine is often revered as the most unreliable version. It's plagued with bottom end issues which range from spun bearings to compression loss related to engineering flaws in the lubrication system. Many auto parts stores sold crankshaft kits for this motor due to its original popularity and likelihood of failure. Many people claim this to be one of the worst engines ever made taking into account the power output, longevity, and terrible fuel efficiency.


      after spending a few years sweating away in the automachine shop, i could say - without a doubt - the most common work we did was rebuild lr2 v6's. the heads alone would show up in rows, all from overheated engines - warped, cracked, and miserable. we tried to get smart about it, so we pulled sets of heads from the junkyard with the idea of having them set up & ready to go. at least half the heads we pulled were already cracked to some extent. these were from vehicles that had accident damage or roll-overs (they weren't in the junkyard because they had engine trouble).

      we ended up with a huge pile of lr2 v6 parts in the corner. blocks, heads, cranks, entire engines. customers would drop it off, we worked up estimates, then call back later and say forget it, keep the parts. so then came the guy who loved lr2's more than we did:

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    17. Member 1985Jetta's Avatar
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      08-10-2012 12:27 PM #42
      Quote Originally Posted by GolfVIDriver View Post
      On what grounds?

      THat actually is a pretty decent engine.
      Hard to work on.

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      08-10-2012 12:28 PM #43
      Quote Originally Posted by 1985Jetta View Post
      The Duratec V6 used in Contours/Mystiques.


      Quote Originally Posted by 1985Jetta View Post
      Hard to work on.
      That's because of what they're installed in. The motor itself does not belong on this list.
      It's easy to work on in the Escape, or in RWD applications.
      Last edited by saron81; 08-10-2012 at 12:30 PM.

    19. Member MAG58's Avatar
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      08-10-2012 12:29 PM #44
      Quote Originally Posted by 1985Jetta View Post
      Hard to work on.
      By those grounds there are a significant number of good V6's that equally qualify for worst.

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      08-10-2012 12:37 PM #45
      Quote Originally Posted by 1985Jetta View Post
      Hard to work on.
      Pretty weak excuse there, mate
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    21. Member 200HP4dr's Avatar
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      08-10-2012 12:38 PM #46
      Some of these engines, while having their faults, are far from a terrible engine. The GM 3.4 is not a bad engine. They make decent power and get pretty good fuel economy. The reason they blow gaskets is an accounting problem, not a design problem. That engine is in everything and has been around forever. Its powered "sporty" sedans to minivans.

      As for the Chrysler engine, when the 2.7 came out in the Intrepid, I thought this engine was a beast! It had to rev for you to go anywhere, but it was hauling a massive car! I bought a brand new Intrepid in 2000 and loved it. I ended up trading it for a Camry less than a year later after my wife got tired of driving such a big car. I had no idea that they just weren't very durable and had all the timing chain and bearing issues. However, I had this engine in an 05 Sebring Sedan and thought it was fine. Had awesome power in a smaller car, but only average fuel economy.

      The mitsu 3.0 was a beast when it came out too. It would power the Chrysler minivans to stoplight victories against many a stock import. Smoked like a freight train though.

      When I think of a truly bad V6, that Audi 2.8 comes to mind. It had no redeeming qualities whatsoever. After driving several 10 and 20V turbo Type 44's, I just couldn't bring myself to "upgrade" to the C4 chassis. They got crappier mileage and were so slow!
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      08-10-2012 12:40 PM #47
      Quote Originally Posted by tjl View Post
      The Peugeot - Renault - Volvo V6 engine was not known for durability. It is why old Volvo 260-series cars are very rare compared to 240-series cars which used the durable "red block" 4 cylinder engines.

      My parents bought a Volvo 760 in '85 or so, when I was about 3. I barely remember them buying it, but I do clearly remember my Dad replacing the cams in the back yard over a weekend when I was in about the 3rd or 4th grade. They got the V6 because they wanted a reliable, resilient drivetrain over the turbo 4


      Also, I believe the 2.7L motors in the all the chrysler products was a rebranded Mitsu. That whole generation is known for being light on power, and heavy on burning oil due to a myriad of issues. My Dad had a first gen Montero with the 2V version that would occasionally burn enough oil to see a blue cloud float by while you were at a stop light. It would mysteriously stop for a few thousand miles, then return. We actually hardly ever had to add oil and it was pretty reliable other than the super annoying belt squeak and lifter tick endemic in that model.
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    23. Member Cousin Eddie's Avatar
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      08-10-2012 12:51 PM #48
      Quote Originally Posted by 200HP4dr View Post
      The reason they blow gaskets is an accounting problem, not a design problem.
      Have you seen the amount of silicone you bridge across the gap when doing lower intake manifold gaskets? It's not exactly the best design. Sure they're powerful but they're still gasket eating junk.

    24. Member 200HP4dr's Avatar
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      08-10-2012 12:58 PM #49
      Quote Originally Posted by Adam144 View Post
      Have you seen the amount of silicone you bridge across the gap when doing lower intake manifold gaskets? It's not exactly the best design. Sure they're powerful but they're still gasket eating junk.
      Oh yeah, are you using the updated gaskets? Once repaired, if done properly will last another 100k. You have to catch them early though. Before they start smoking. That's the thing, is that by the time the symptoms are serious enough for the average person to care about them, its already too late.

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    25. 08-10-2012 01:01 PM #50
      Quote Originally Posted by tjl View Post
      Early 1990s 3.8L "Essex" V6 engines in the Ford Taurus and Mercury Sable had a reputation for frequent head gasket failures.
      That engine bay brings back nightmares. Then they decided to pair it with the most unreliable, clunky, and grenade prone auto transmission.
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