Rough Idle- No Power - Misfire 1-3-5 Camshaft Sensors Bank 1 - Chevy Traverse Forum: Chevrolet Traverse Forum
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post #1 of 15 (permalink) Old 09-17-2019, 07:46 PM Thread Starter
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Unhappy Rough Idle- No Power - Misfire 1-3-5 Camshaft Sensors Bank 1

2010 Traverse LT AWD

Hello Friends,

If someone has solutions to this or ideas that would be amazing. I've searched everywhere and can't seem to find a solution.

I was driving 55MPH the other day when I lost all power and check engine light started flashing. As soon as I was able to pull off to the shoulder, I checked codes immediately.

P0300, P0301, P0303, P0305 (Misfires on bank 1, cylinders 1-3-5)
P0342, P0368 (Camshaft A and B on Bank 1)
P0102 (MAF A Circuit Low)

Before all of this, I was throwing just codes
P2097 (Post CAT Trim Rich) and
P0119 (Coolant Temp Sensor Intermittent)

I've check and changed both Camshaft Sensors, along with Bank 1 Downstream O2 Sensor.

I've taken off the intake manifold, and the valves definitely have carbon buildup on them, but would this really cause the engine not to work properly?

The timing chains were replaced 3500 Miles ago, along with a faulty Cam Phaser on bank 1.
The car has run smoothly since then, except for the CAT and Coolant Sensor codes going off.
I bought this vehicle used about 3800 miles ago. All new plugs, and coils seem fine.
It looks like the same O2 sensor was replaced before, or the pig tail on the sensor broke on its own.

When I idle the vehicle, the exhaust pipe will be super hot for bank 2, but isn't even really warm for bank 1.

What would cause just one bank to misfire on all three cylinders at once? Does anyone have any solutions? I'm running out of things to check. My mechanical knowledge is far from superior, but I can do a lot of work on my own with the aid of YouTube and forums like this.
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post #2 of 15 (permalink) Old 09-18-2019, 02:50 PM Thread Starter
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Here are images of cylinders 1 3 and 5. Also, I put a wrench on the crank bolt and it seems like there is no movement on the valves on bank 1. Could this be a timing chain issue on bank 1? And if so, why aren't any of the valves bent?
Attached Images
File Type: jpg IMG_3295.jpg (308.5 KB, 17 views)
File Type: jpg IMG_3294.jpg (306.1 KB, 15 views)
File Type: jpg IMG_3293.jpg (261.9 KB, 14 views)
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post #3 of 15 (permalink) Old 09-19-2019, 12:56 PM
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The carbon buildup does seem to be excessive in my opinion. It may in fact be the root of your problems, but I am no expert, Hopefully someone with more expertise can comment. In the meantime you may try cleaning those with either walnut blasting or the CRC cleaner.
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post #4 of 15 (permalink) Old 09-19-2019, 01:17 PM
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Just to add to a possibility, perhaps some connectors were put back on the wrong sensor after the repairs. It happens, check this out from GM, after Colorado/Canyon repairs.
https://gm-techlink.com/?p=11770
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post #5 of 15 (permalink) Old 09-19-2019, 01:18 PM
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You also should use Top Tier Gasoline always and Techron periodically.
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post #6 of 15 (permalink) Old 09-19-2019, 01:28 PM
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And after a lot of misfiring, all the raw fuel going into the cat usually clogs them.
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post #7 of 15 (permalink) Old 09-19-2019, 03:09 PM Thread Starter
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I found the problem with cylinders 1 3 and 5 not working. I do not know what initially caused this, but I'm pulling it all apart now to see how much damage was caused. It seems like, so far, that bank 2 and the main gear are fine and only the bank 1 chain snapped, but I have no idea what initially caused it.
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File Type: jpg IMG_3320.jpg (316.7 KB, 15 views)
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post #8 of 15 (permalink) Old 09-19-2019, 04:02 PM
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Wow.....

thanks for the pic.

2010 FWD LT1-Gold Mist Metallic- seats 8.
Build Date- July 31, 2009-2nd day of Spring Hill 2010 production.

2013 Equinox 3.6L - 88,000
2010 Traverse 3.6L- 153,000
2003 Trailblazer 4.2L- 181,500
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post #9 of 15 (permalink) Old 09-20-2019, 01:30 PM
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Just throwing this out there, if the cats are clogged, the pressure may have great enough for the chain to break. Anybody else want to speculate?
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post #10 of 15 (permalink) Old 09-20-2019, 02:31 PM Thread Starter
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I was only getting that one code, and it was very intermittent. I don't believe there is a clogged CAT, wouldn't it throw more specific codes than POST CAT too rich if it were the catalytic converter? I do, however, appreciate any feedback as I am planning on fixing this and putting it all back together. Not sure how doable/salvageable that is until I get it torn down some more. I finally just got the timing chain cover off of the vehicle while the motor is still in the vehicle.
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