LT6 engine failures/problems
#361
Melting Slicks
Thread Starter
I love all Corvettes and especially the C4 ZR-1. GM did an excellent job of testing the LT5 before it went into the new Z. Ford and GM use to do actual endurance testing with engine builders and drivers. Now we leave to the brilliant AI. Just a sign of the times. 180K price for a new hot rod and the engine blow. I hope GM gets in front of this. It been going to long. I hope to drive a ZR-1 soon!
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#362
Exactly why I think this thread should mirror the sticky thread in the C8 General Forum and just name it "C8 Z06 Problems".
#363
#365
#366
Mine and a couple of others here sound like that. But mine is reversed, when it warms up it goes away, I don’t hear it when I’m driving and doesn’t affect the drivability. Everyone is different on their tolerance of what bothers them, it doesn’t bother me at all. I’d be more worried about a subpar dealer causing bigger issues than the mechanical noise of the LT6.
Last edited by minn19; 05-02-2024 at 09:57 AM.
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Phil1098 (05-08-2024)
#367
Mine and a couple of others here sound like that. But mine is revered, when it warms up it goes away, I don’t hear it when I’m driving and doesn’t affect the drivability. Everyone is different on their tolerance of what bothers them, it doesn’t bother me at all. I’d be more worried about a subpar dealer causing bigger issues than the mechanical noise of the LT6.
I do worry about a local small dealer tearing into it as a learning experience. However, I just had a C7 Z06 squawking pilot bearing replaced by same dealer. This repair was driveline disassembly from rear end to flywheel. They pulled it off without a hitch and the squawking is gone. So... maybe they have some skilled mechanics.
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minn19 (05-02-2024)
#368
Le Mans Master
Very curious how the solid, non-adjustable valvetrain will hold up over time.
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Preshenne (05-02-2024)
#369
Race Director
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Location: Central Illinois
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Car Junkie 24 (05-14-2024)
#370
Team Owner
Not excited at all if the motor has to come out for "remediation", especially if this dealer has to do it, haven't had the best luck with this particular dealer with my truck and my '08 Z06 since they changed ownership. Don't want some not so skilled "technician" learning on my new Z, especially if it was the guy who did the dealer prep work on my truck (long story.....).
Maybe we can have Jason fly out to do the work ?
Note: I'm not implying in any way that Jason Neal did something wrong in the assembly. I'm sure he knows how to build an LT6. Just (sarcastically) don't want some inexperienced technician "learning" on my $150K+ car if it needs serious work.
N
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Preshenne (06-05-2024)
#372
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Well, s---. I got the same noise. Just ~900 miles. Came back from a short drive up to Tortilla Flat on some nice twisties to get used to the car a little better after a very careful, fully compliant per the instructions in the manual 500 mile initial break-in. Still getting the "feel" of the car, so I wasn't really pushing it - not at all - like I said, still getting familiar with what the car can do. Got home, noticed tihe noise, re-read the germane bits in this thread, listened again to the motor with a stethescope (yeah, that's it, that's the infamous ticking), and immediately made an appointment with the dealer to check it out. Apt is tomorrow morning. Note the engine builder's signature......
Not excited at all if the motor has to come out for "remediation", especially if this dealer has to do it, haven't had the best luck with this particular dealer with my truck and my '08 Z06 since they changed ownership. Don't want some not so skilled "technician" learning on my new Z, especially if it was the guy who did the dealer prep work on my truck (long story.....).
Maybe we can have Jason fly out to do the work ?
Note: I'm not implying in any way that Jason Neal did something wrong in the assembly. I'm sure he knows how to build an LT6. Just (sarcastically) don't want some inexperienced technician "learning" on my $150K+ car if it needs serious work.
Not excited at all if the motor has to come out for "remediation", especially if this dealer has to do it, haven't had the best luck with this particular dealer with my truck and my '08 Z06 since they changed ownership. Don't want some not so skilled "technician" learning on my new Z, especially if it was the guy who did the dealer prep work on my truck (long story.....).
Maybe we can have Jason fly out to do the work ?
Note: I'm not implying in any way that Jason Neal did something wrong in the assembly. I'm sure he knows how to build an LT6. Just (sarcastically) don't want some inexperienced technician "learning" on my $150K+ car if it needs serious work.
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BenThere (06-05-2024)
#373
Drifting
Well, s---. I got the same noise. Just ~900 miles. Came back from a short drive up to Tortilla Flat on some nice twisties to get used to the car a little better after a very careful, fully compliant per the instructions in the manual 500 mile initial break-in. Still getting the "feel" of the car, so I wasn't really pushing it - not at all - like I said, still getting familiar with what the car can do. Got home, noticed tihe noise, re-read the germane bits in this thread, listened again to the motor with a stethescope (yeah, that's it, that's the infamous ticking), and immediately made an appointment with the dealer to check it out. Apt is tomorrow morning. Note the engine builder's signature......
Not excited at all if the motor has to come out for "remediation", especially if this dealer has to do it, haven't had the best luck with this particular dealer with my truck and my '08 Z06 since they changed ownership. Don't want some not so skilled "technician" learning on my new Z, especially if it was the guy who did the dealer prep work on my truck (long story.....).
Maybe we can have Jason fly out to do the work ?
Note: I'm not implying in any way that Jason Neal did something wrong in the assembly. I'm sure he knows how to build an LT6. Just (sarcastically) don't want some inexperienced technician "learning" on my $150K+ car if it needs serious work.
N
Not excited at all if the motor has to come out for "remediation", especially if this dealer has to do it, haven't had the best luck with this particular dealer with my truck and my '08 Z06 since they changed ownership. Don't want some not so skilled "technician" learning on my new Z, especially if it was the guy who did the dealer prep work on my truck (long story.....).
Maybe we can have Jason fly out to do the work ?
Note: I'm not implying in any way that Jason Neal did something wrong in the assembly. I'm sure he knows how to build an LT6. Just (sarcastically) don't want some inexperienced technician "learning" on my $150K+ car if it needs serious work.
N
Unfortunately, This will change.
Last edited by GatorsJMC; 06-05-2024 at 02:29 PM.
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BenThere (06-05-2024)
#374
Drifting
I honestly think it's characteristic of this engine. Even the TSB says it may only be a marginal improvement. I.E. it's just how they are. You've got a direct injection system (that are loud ticking systems to begin with) and the LT6 runs up to 5,000PSI + vs. 2,900 in LT2. The increased pressure will make them tick even louder. The other thing to think about is this, if it was fine when it was zero miles, and now in only 500 miles it's doing damage, why open it up? If it's truly got a problem then the damage is done, they don't squirt a tube of Self Heal into the engine. The only thing the TSB does is reseat some cam caps. When mine is hot and being driven slowly through my neighborhood, it makes all kinds of sounds. I won't be doing anything with it because nothing will be accomplished. I look forward to driving mine every chance I get, don't over think this, it's not made by Singer.
I'm ok with noisy as long as it's not destructive noisy.
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BenThere (06-05-2024)
#375
Ticking
Now over 600. Ticking still there. I am just going to drive on. If it self destructs, GM will owe me a new motor. I also have a 62 340 HP with solid lifters. I treat that racket as the music of high performance. Will do same here. I have read the service bulletin. It only loosens the brackets one turn and re-seats. That is not a very positive action by any interpretation. Not worth the risk of messing with major disassembly
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#376
Like others have said, these engines make noise. No where have I read that if the valve train is making that it is doing any damage and as the last post says they have a nice long warranty on the engine if this turns out not to be the case. I drive my Z06 all over and never give it a thought because I'm not listening for ticks I'm listening for the ROAR from the exhaust which is music to my ears especially in Z mode where you get that wonderful burbling sound from decel!
#377
Ticking
I agree. Open sound programmed into my mode. It is glorious
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BenThere (06-05-2024)
#378
Team Owner
I honestly think it's characteristic of this engine. Even the TSB says it may only be a marginal improvement. I.E. it's just how they are. You've got a direct injection system (that are loud ticking systems to begin with) and the LT6 runs up to 5,000PSI + vs. 2,900 in LT2. The increased pressure will make them tick even louder. The other thing to think about is this, if it was fine when it was zero miles, and now in only 500 miles it's doing damage, why open it up? If it's truly got a problem then the damage is done, they don't squirt a tube of Self Heal into the engine. The only thing the TSB does is reseat some cam caps. When mine is hot and being driven slowly through my neighborhood, it makes all kinds of sounds. I won't be doing anything with it because nothing will be accomplished. I look forward to driving mine every chance I get, don't over think this, it's not made by Singer.
This is exactly the results of my TSB repair, left bank, cam cap resets. A marginal improvement (reduction) in tapping sound, about 600 mi ago, which seems to be increasing again, or it may just be my imagination. Either way, I'm going back for a PICOSCAN to have it evaluated.
I'm ok with noisy as long as it's not destructive noisy.
I'm ok with noisy as long as it's not destructive noisy.
Now over 600. Ticking still there. I am just going to drive on. If it self destructs, GM will owe me a new motor. I also have a 62 340 HP with solid lifters. I treat that racket as the music of high performance. Will do same here. I have read the service bulletin. It only loosens the brackets one turn and re-seats. That is not a very positive action by any interpretation. Not worth the risk of messing with major disassembly
Like others have said, these engines make noise. No where have I read that if the valve train is making that it is doing any damage and as the last post says they have a nice long warranty on the engine if this turns out not to be the case. I drive my Z06 all over and never give it a thought because I'm not listening for ticks I'm listening for the ROAR from the exhaust which is music to my ears especially in Z mode where you get that wonderful burbling sound from decel!
Anyway, thanks to all y'all for your comments and observations. That's the great thing about this forum. we can talk about this stuff and kick it around a little. I appreciate all your comments. Thanks again! I'll let y'all know how things get on.
#379
My Z has been in the shop for almost 6 months now. Was around 9k miles on it when the engine failed.
#380
You can add me to the list of engine failures. VIN 652. Engine was starting rough in November. In December one day it wouldn’t turn over. Had it towed to the dealership, they tore it down, claimed there was scoring in multiple cylinders, and replaced the whole engine (took until March). Got the car back and within a week the transmission was throwing temperature warnings in 50 degree weather driving 35 min on a local highway. Now waiting for a new transmission.
My Z has been in the shop for almost 6 months now. Was around 9k miles on it when the engine failed.
My Z has been in the shop for almost 6 months now. Was around 9k miles on it when the engine failed.