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Discussion Starter #1
I purchased my 2011 Traverse LTZ, August 2014 with 42,000 miles. Today, it has 171,424 miles. P0420 has thrown other codes which disappeared when I did the work listed below.
1. Installed new spark plugs (ACDelco 41-109 Iridium Spark Plugs) 19.99
2. Installed new ignition coils (D515 Ignition Coil ACDelco C1555) 205.27
3. Installed new Camshaft Position Sensor (OEM Engine Camshaft Position Sensor 12615371) 12.26
4. Installed new Crankshaft Position Sensor (ACDelco O.E. Engine Crankshaft Position Sensor 213-4573) 19.14
5. Installed new catalytic converter on bank 1 205.27
6. Installed new O2 sensor Upstream, Bank 2, ( ACDelco 213-4553) 67.72
7. Installed new O2 sensor Downstream, Bank 2,( ACDelco 213-4407) 79.96
8. Installed new knock sensor (ACDelco 12636736) 22.38
9. Installed PCV Valve Tube (ACDelco 12630279) 14.93
10. Installed new PCV Valve Adapter (ACDelco 12681693) 17.16
11. Installed new PCV Valve Tube (ACDelco 12630280) 15.21
12. Installed new Oil Vented Cap (ACDelco FC243) 11.33
Two days later,P0420 came back, and I've been up and down highways and roads hoping that the code will go away. Today, I decided to look at misfires.So after pouring Seafoam into the tank,and a 75 mile drive at various speeds, coasts, and accelerations, the scanner revealed that all misfires were on bank one. Cylinders 1,3 & 5 had 38, 6, and 2 respectively. I need help on what I should do next? I am trying to keep it for at least another 80,000 miles.
 

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What kind of Code scanner do you have? I would suggest to get a Bluedriver or similar to read the CAT temps, as well as other vitals.
When you had the Manifold cover off, you did check for Carbon Deposit Buildup on the Valves didn't you? Good possibility the valves aren't sealing properly, the Seafoam may help.
Check your VVT screens, make sure they are clean and working, try them with a 9V battery when they are out.
Any change after the Seafoam? I would try one non Seafoam tankful and then a bottle of Techron concentrate. You always use Top Tier Fuel Right?
 

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Discussion Starter #3
I have a Actron AutoScanner Plus, CP9580A. I did not check for carbon deposits on the valves.Thanks for the direction because it gives me inspiration to continue working on this vehicle. This morning, I added Techron to the 2 gallons that were left in the tank. I'll drive it to the gas station, add gas and drive some more. Afterwards, I'll take the manifold back off and check the valves and the VVT. I use Sunoco and Shell only. I was using their regular, but now, I use their plus or premium. Again, thanks for the help.
 

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Premium doesn't really matter as long as it is top tier, I so see Shell on the list but not Sunoco, the engine is rated for 87 octane. TOP TIER™ Gasoline Brands
Do you use Synthetic oil or Dino and how long is it between changes? I don't know about adding the Concentrate to a near empty tank then driving, it is supposed to be filled up right after emptying the bottle then driven.
 

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Discussion Starter #5
I pulled the two VVT actuators and they were very clean. The screens were free of debris and the actuator opened and closed with no problems when I connected a 9V battery to them.
 

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Discussion Starter #6
I purchased my 2011 Traverse LTZ, August 2014 with 42,000 miles. Today, it has 171,424 miles. P0420 has thrown other codes which disappeared when I did the work listed below.
1. Installed new spark plugs (ACDelco 41-109 Iridium Spark Plugs) 19.99
2. Installed new ignition coils (D515 Ignition Coil ACDelco C1555) 205.27
3. Installed new Camshaft Position Sensor (OEM Engine Camshaft Position Sensor 12615371) 12.26
4. Installed new Crankshaft Position Sensor (ACDelco O.E. Engine Crankshaft Position Sensor 213-4573) 19.14
5. Installed new catalytic converter on bank 1 205.27
6. Installed new O2 sensor Upstream, Bank 2, ( ACDelco 213-4553) 67.72
7. Installed new O2 sensor Downstream, Bank 2,( ACDelco 213-4407) 79.96
8. Installed new knock sensor (ACDelco 12636736) 22.38
9. Installed PCV Valve Tube (ACDelco 12630279) 14.93
10. Installed new PCV Valve Adapter (ACDelco 12681693) 17.16
11. Installed new PCV Valve Tube (ACDelco 12630280) 15.21
12. Installed new Oil Vented Cap (ACDelco FC243) 11.33
Two days later,P0420 came back, and I've been up and down highways and roads hoping that the code will go away. Today, I decided to look at misfires.So after pouring Seafoam into the tank,and a 75 mile drive at various speeds, coasts, and accelerations, the scanner revealed that all misfires were on bank one. Cylinders 1,3 & 5 had 38, 6, and 2 respectively. I need help on what I should do next? I am trying to keep it for at least another 80,000 miles.
 

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Discussion Starter #7
9273
So,I guess this label is telling me that my 2011 Traverse LTZ has a California Emission and that the new catalytic converter is not good enough, and maybe if I install an EPA approved catalytic converter like the Eastern 5045 EPA approved catalytic converter, the code may go away? Am I the only one who has made this mistake? The wrong catalytic converter for the emission system?
 
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