Correct valve position for Corsa installation…

[BigBrett]

Hello all, I have just installed a Corsa cat back system on my 2024 CTS5V 6 speed manual
and sure as shit i got the dam CEL
we followed every step made sure per Corsa the valves on the car were open, then we verified upon valve install they were open,
system was installed at a 30 plus year performance shop who does this stuff all the time, they made sure every clamp was correct, they made sure all joints were tight, they even started the car while on lift to make sure no leaks. Got 10 minutes down the road and pow CEL.
Spoke with Scott at Tapout, he is awesome to work with, and we started from scratch, went back to shop made sure all valves operate as they are designed, no binding nothing, they work fine, drove car again, changed the valves to tour mode etc. no issues they work and move as they should.
i pulled the 3 codes
P317F
P316E
P3173
All 3 are exhaust valve codes.
I am waiting on Corsa to get back to me, but my gut tells me they will need the relearn update through a scanner? and thoughts, I am not a car or scanner guy so this has me like UGH

 

[shbox]

A relearn is just a button push on a scanner menu. Nothing to fret about.

 

[BigBrett]

guys what scanner would i need, something that is not super costly as i probable will use it to fix this and that's it, but also want one that is not junk thanks

 

[BigBrett]

A relearn is just a button push on a scanner menu. Nothing to fret about.

What scan tool do I need to buy. Thanks again for the help

 

[Sully]

I've addressed

What scan tool do I need to buy. Thanks again for the help

Give this thread a once over, I've addressed it a few times. Corsa Xtreme Exhaust issue

 

[BigBrett]

I've addressed


Give this thread a once over, I've addressed it a few times. Corsa Xtreme Exhaust issue

I have, maybe missing it, but what brand of scan tool is needed, don't want no $600.00 tool but a good one as well? thanks IS THIS A GOOD ONE? THANKS AGAIN

 

[Sully]

Any decent bi-directional OBD tool should be able to do it... I have several including a relatively cheap one (HERE) which will perform the relearn.

The relearn function resides within the ECM > Special Functions > Learn Function > Variable Exhaust Flow Control Valve > Learn

 

[BigBrett]

Any decent bi-directional OBD tool should be able to do it... I have several including a relatively cheap one (HERE) which will perform the relearn.

The relearn function resides within the ECM > Special Functions > Learn Function > Variable Exhaust Flow Control Valve > Learn

Thank you sir appreciate the help! again Thank you!

 

[BigBrett]

Ok after looking at this something is off when in race mode the driver’s side is wide open. The passenger side is 1/2 open at best
In silent the passenger side is closed and quit
Driver side is 7/8 closed and louder.
Any ideas.

 

[BigBrett]

Hello all
So working with corsa, and I loosened the passenger valve to make sure not bound up, then started the car
in race mode the driver side is wide open the left side is like 60% open, i can reach in and rotate it open very easily
then when i go to quit mode the driver side is like 90% closed but still loud vs Passenger which is tight closed and quit. It seems like there range of motion is out of sync.
they both move freely just not the same range of motion. Corsa feels this is not a Valve relearn anyone have this issue, then i tightened the valve back up and acted the same, so i believe there is no binding but just range of motion?

 

[BigBrett]

ok Today i did a car and coffee run, to meet people and see if anyone had a place here, they would recommend looking at the car, here in Myrtle beach we don't have places like Race Proven Motorsports or LMP
a guy with new Camaro did exhaust same issue basically, valves were out of sync, they did not open or close the same, he said unhook battery with valves wide open, make sure they are wide open, and open manually if you need to
then unhook batter for 10 minutes then see if they're learn. well, they did both open all the way, both seem to close all the way, driver side maybe a tad opens like 5%
started car, had to reset the windows etc. and valves work but light is still on. Now I am assuming if i drive it and it recycles a few times it may go off, if not may have to just to be safe do a re learn and erase codes. thoughts?

 

[BigBrett]

ok all hope all is well
After taking the valves out and making sure they are correctly installed, i noticed on the driver side the installer broke a bolt upon install, so i took the muffler off took it to a machine shop they removed all 3 bolts and instead of the stainless crush nuts that Corsa welds to the flange they removed those and just put nuts on back side with hex head bolts etc. This fixed the actuator and valve movement. Now they both fully open and fully close, this side on stealth mode did not fully close, as I assume the actuator was out of alignment causing this to bind.
put it back on, and started the car and as i said they both 100% work as they should but still get check engine light, bought a scanner so did a full scan cleared the codes then did a relearn of the valves, shut it off cycle the key and fucking light pops back on? NOW what LOL

 

[5VBW Nick]

Part it out

 

[DZnutz]

This is clearly something a competent Dealer or Corsa themselves have to help you with.

 

[DZnutz]

ok all hope all is well
After taking the valves out and making sure they are correctly installed, i noticed on the driver side the installer broke a bolt upon install, so i took the muffler off took it to a machine shop they removed all 3 bolts and instead of the stainless crush nuts that Corsa welds to the flange they removed those and just put nuts on back side with hex head bolts etc. This fixed the actuator and valve movement. Now they both fully open and fully close, this side on stealth mode did not fully close, as I assume the actuator was out of alignment causing this to bind.
put it back on, and started the car and as i said they both 100% work as they should but still get check engine light, bought a scanner so did a full scan cleared the codes then did a relearn of the valves, shut it off cycle the key and fucking light pops back on? NOW what LOL View attachment 31695View attachment 31694View attachment 31696View attachment 31697View attachment 31698

Why didn't you take it back to the installer and tell them they just bought you a new exhaust?

 

[Sully]

@BigBrett Working off alot of assumptions here but to level set, my assumption is 1) clock springs are correctly installed 2) the valve actuators are mechanically sound and 3) the valve springs in the Corsa valve are the correct spring weight (I've read that this may not always be the case)

Put the BW in service mode (e.g. hold start button for about 8 seconds or so, feet off the pedal), I'd start by doing a live data review, with the Creader, go to ECM > Data Stream and scroll till you find Variable Exhaust Flow Control Valve Command & Variable Exhaust Flow Control Valve Command 2, there should be a % value to the right. Both of these values should be similar to each other (~ +/- 1%). (based on my observations)

Now, switch the drive mode while monitoring those values. The goal is to determine what values the ECM is obtaining which may help indicate if there's an issue and which valve actuator. The % values are what the ECM sees as the % of which the valve is closed. These % values will correlate to a voltage value received by the ECM, I won't go into that now.

Tour/Snow modes should read around ~89%

Sport mode should read around ~50%

Track/V mode should read around 10-11%

If these are the values you are seeing then its unclear to me why you are getting the codes unless there's something wrong with the mechanical valve springs, actuators, the extension cables, or something upstream. If the values do align with the above, I'd try clearing the codes, and then before starting, disconnect the battery and give it an hour or so. See if that can flush out any residual values which may be lingering in a temporal state.

Note: Be sure you've updated your reader before doing the above to ensure you have all the latest data elements.

I'll upload some pictures I took to help ya when I get a moment.

 

[BigBrett]

Why didn't you take it back to the installer and tell them they just bought you a new exhaust?

I just dont need the headache, they will just deny etc. i had it fixed all good, the valves work as they should, but still have the CEl light