Engine Failure

[Ergoc5]

Add me to the list, I'm not sure if there's an official thread for us to gather so this was the first I found. Manual CT5, '22 with 19k on the odo, did proper break-in with service. I was driving the car last week and noticed performance was off under heavy accel in 2nd and 3rd gear. Turned all the TC settings off and tried again, engine was revving up but wheels weren't spinning. No codes and was running "fine" just cruising around town but dealer came and picked it up from my house last Friday. They ran a compression test on it yesterday and decided new engine + supercharger were required. No idea on how long it'll take yet at this stage but figured I'd share my experience.

Wow! So sorry to hear and after 19k miles!

 

[jimijuma]

Add me to the list, I'm not sure if there's an official thread for us to gather so this was the first I found. Manual CT5, '22 with 19k on the odo, did proper break-in with service. I was driving the car last week and noticed performance was off under heavy accel in 2nd and 3rd gear. Turned all the TC settings off and tried again, engine was revving up but wheels weren't spinning. No codes and was running "fine" just cruising around town but dealer came and picked it up from my house last Friday. They ran a compression test on it yesterday and decided new engine + supercharger were required. No idea on how long it'll take yet at this stage but figured I'd share my experience.

Well, all manufacturers have issues don’t you know.

On a much more serious note, it would be wise to have a lemon law lawyer on speed dial.

Ugh, sickening!

 

[MookdocOE]

Add me to the list, I'm not sure if there's an official thread for us to gather so this was the first I found. Manual CT5, '22 with 19k on the odo, did proper break-in with service. I was driving the car last week and noticed performance was off under heavy accel in 2nd and 3rd gear. Turned all the TC settings off and tried again, engine was revving up but wheels weren't spinning. No codes and was running "fine" just cruising around town but dealer came and picked it up from my house last Friday. They ran a compression test on it yesterday and decided new engine + supercharger were required. No idea on how long it'll take yet at this stage but figured I'd share my experience.

What is your build date? Sorry, that sucks!

 

[NorCal Blackwing]

I updated the Blown Motor Registry

Thread 'CT5BW Blown Motor Registry'

Oct 17, 2024

I started a list of the reported blown motors on this forum. It's far from scientific because not all people who have had this issue are on the forum, and not all on the forum who have had an issue will post about it, but I'm hopeful it will shed some light on the failure modes if nothing else.

At a glance it seems to be an issue with every model year, the bottom-end tends to give out at fairly low miles, and the lifters can fail at pretty much any mileage. I didn't include transmission but it seems like it's happened for both manuals and autos.

If I've tagged you here and you have a...

• NorCal Blackwing
• Replies: 29
• Forum: Blackwing General Discussion

• 

 

[Turtleb00st]

While this video discusses the break-in for the LT6, I suspect the same principles apply to other GM high-performance engines.

According to the GM engineers, the initial 500-mile break-in is to uniformly polish the surface of the bearings.

Gm engineers also say to run Mobil 1 which has been tested over and over to have lower viscosity than any other 5w30 in the lf4 which already have low oil pressure issues at idle/low rpm.

Gm engineers tell 5.3 owners to run 0w20 oil

Gm engineers created the ecu software so the cars rev to the sky on startup when the bearings are dry (even worse with water oil) so the cats warm quicker.

A lot of their decisions are based on political nonsense (cafe, carb ect)

I personally break any new car in my household extremely hard. Progressive boost up to max boost within the first 100 miles + tons of vacuum…. Change the oil and it’s broken in. I build motors, tune cars. This is what i do after years of experience and talking with my machine guys. Do whatever you think works better…..

Add me to the list, I'm not sure if there's an official thread for us to gather so this was the first I found. Manual CT5, '22 with 19k on the odo, did proper break-in with service. I was driving the car last week and noticed performance was off under heavy accel in 2nd and 3rd gear. Turned all the TC settings off and tried again, engine was revving up but wheels weren't spinning. No codes and was running "fine" just cruising around town but dealer came and picked it up from my house last Friday. They ran a compression test on it yesterday and decided new engine + supercharger were required. No idea on how long it'll take yet at this stage but figured I'd share my experience.

If they did a compression test and said it’s toast, that would most likely mean damage via detonation (cracked piston ring land). That’s odd as most of these failures are Rod bearings

 

[TFG]

Gm engineers also say to run Mobil 1 which has been tested over and over to have lower viscosity than any other 5w30 in the lf4 which already have low oil pressure issues at idle/low rpm.

Gm engineers tell 5.3 owners to run 0w20 oil

Gm engineers created the ecu software so the cars rev to the sky on startup when the bearings are dry (even worse with water oil) so the cats warm quicker.

A lot of their decisions are based on political nonsense (cafe, carb ect)

I personally break any new car in my household extremely hard. Progressive boost up to max boost within the first 100 miles + tons of vacuum…. Change the oil and it’s broken in. I build motors, tune cars. This is what i do after years of experience and talking with my machine guys. Do whatever you think works better…..



If they did a compression test and said it’s toast, that would most likely mean damage via detonation (cracked piston ring land). That’s odd as most of these failures are Rod bearings

I personally like your break-in process because it seems to line up with my logic. Additionally, thanks for the commentary re:compression. Admittedly, I'm not mechanical guy so I wasn't exactly sure what that type of test would produce. I've been in the dark all week from the dealership, I'm hoping they have some more info for me this week. Side note, I bought my first American SUV a few months before I received the Blackwing and we went through an eerily similar process whereas we had ended up with 2 blown engines on her 22' Chevy Tahoe(both ~20k mi) and after the second one we went through the GM buy-back program. I am wondering if that's what I'll choose to do with this situation as well.