CT5-V Blackwing 6-sp (2022) surging during normal driving

[jbawden]

Looks like it only covers '22 model year. '23+ must have updated parts.

 

[dribs15]

Looks like it only covers '22 model year. '23+ must have updated parts.

The date on that TSB I posted is April 2022... so I don't know if there is an updated/newer one for later model years. @Ergoc5's car is a 22... so I thought that what I posted was what he was referring to.

 

[Ergoc5]

The date on that TSB I posted is April 2022... so I don't know if there is an updated/newer one for later model years. @Ergoc5's car is a 22... so I thought that what I posted was what he was referring to.

Yeah TSB mentioned 22 MY, not sure if anyone with MY 23 or 24 are seeing this issue

 

[Ergoc5]

Just as an update I got the car back from the dealer after the TSB fix...they also replaced the oil flow control valve. I don't have the hesitation so far (it was intermittent anyway) and the idle seems a bit smoother (maybe my imagination). However the car seemed to be out of alignment (they may have dropped the front subframe to get to the oil valve) and the boost was only around 6 or 7 psi ...it kissed 10 to 11 psi but seemed mostly around 6 or 7....are you guys seeing this usually? I thought I used to hit 9 psi normally....but seeing 6 or 7 where I used to see 9. I know this is rpm dependent on centrifugal superchargers but on PD superchargers I thought you would see steady boost. What are you guys seeing at different rpms? They checked it out and said it was working to spec.

EDIT ....could be TC kicking in as well....combo of narrower winter tires and cold pavement.

 

[Ergoc5]

Unfortunately I still have the engine hesitation....I thought it had improved but it actually has not. I don't know if GM or the dealer can do anything about it at this point.....seems tune related. Time to reach out to @WONT TAP ?

 

[Ray]

For those of you out there who have this surging problem, and aren't having success working through a dealership, I believe I can resolve this for you via remote tuning. We would need for you to purchase HP Tuners ($400), then we can set you up to do a data scan and capture the issue. Once we have it captured, I will see if I can figure out the cause and a potential solution for you.

I’d like to give that a try. How do I contact you?

 

[WONT TAP]

I’d like to give that a try. How do I contact you?

My direct email address is ScottC@TapoutTuning.com.

 

[Ergoc5]

I had my surging issue "fixed" under the TSB like was mentioned earlier in this thread....just as an update it does not happen as often as it used to but it still happens occasionally unfortunately. I also noticed that when cold and driving at parking lot speeds under 2k rpm the car does not feel smooth (it's not super obvious but def not smooth). I don't recall how it felt before, could be a characteristic of the LT4? It does smooth out a bit when the car is warmed up. The TSB may have caused other issues that wasn't there before. In summary the TSB did not completely fix the issue.

 

[mprice07]

I can fairly consistently reproduce this issue now. On my ride home, I turn left onto a street at a certain speed, and settle into around 2k rpms in 3rd or 4th and the issue occurs. The last handful of times where traffic allowed this pattern, it happened.

That's crazy... Experiencing the same thing. Left hand turn only. Mainly about 5 minutes after I leave if that.