General CTS Vsport Thread

[kevm14]

You really need to verify that it does an enhanced or OEM specific stream. I did not look into that

[Bob]

New plugs ordered. $38 at Advance Auto after coupon code

Also, $18 mail in rebate from AC Delco - $20 net for a new set of Iridium plugs - not bad at all!

[Bob]

I did a brief blast with the Bluedriver installed. Fuel trims seem to go to zero and stay there at WOT, which I guess is a good sign. Need to look at timing next.

[Bob]

Whoa! It’s been a long time since I’ve updated this thread. I ended up having an issue with misfiring in high boost high load situations that started happening sometime late last year. Replaced all 6 coils today and the car seems to be better. It also seems to idle smoother and be more responsive in general. I need to do some highway pulls to confirm the issue is gone.

I also pulled all the plugs and checked them and they looked good.

[Bob]

Just ordered two new wastegate solenoids to eliminate the post shutdown buzzing noise that is common with the Vsport. Also, these may help make boost more consistent, though I haven't noticed any major issues.

[Bob]

The car now has no noticeable black smoke at a WOT take off in first and it pulls harder and struggles for traction. I wish I hadn't let the coils sit in the garage for 2 months because of no time to install.

[kevm14]

We call that the parts funnel.

[Bob]

I installed the wastegate actuators yesterday. The most important thing is the shutdown hum is gone. Also, it seems to be quicker to build boost at part throttle in the lower gears. Overall, it's been a good couple weeks of Vsport maintenance.

[kevm14]

Any pics of anything? This is a repair forum after all...allegedly. Brief time/materials description...

[Bob]

I took no pictures, but I used the following videos:

Wastegate solenoids: https://www.youtube.com/watch?v=dDTEHJVe-F4

Coils/plugs: https://www.youtube.com/watch?v=aysijIIfIDg