Engine power loss - Chevy Traverse Forum: Chevrolet Traverse Forum
 
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post #1 of 6 (permalink) Old 09-29-2019, 10:38 PM Thread Starter
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Engine power loss

My 2009 traverse got towed the other day. Picked it up and was driving home, and all of a sudden, it looses power, and will barley go 40 MPH. Does anyone know what could have caused this. When I got it back in February, my son pulled codes thru the OBD II port, and it showed to have a designated cylinder # 5 misfire. I changed all of the coil packs and plugged, using erideum plugs, and now all cylinders are reading misfire, and is showing to be running lean on bank 1 and 2 at the cats. Has anyone ever experienced this problem before. Any advice would help. Thanks.
post #2 of 6 (permalink) Old 09-30-2019, 11:53 AM
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Just to make sure-- these are ACDELCO Iridiums?..... and not some 4 prong aftermarket.


Also- being a 2009... you may have severe carbon buildup on the valves (sticky valves).

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 #3 of 6 (permalink) Old 09-30-2019, 11:55 AM
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You may want to run a bottle of TECHON Concentrate PLUS to clean up the lips of the valves.

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 #4 of 6 (permalink) Old 10-02-2019, 07:28 PM
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If you're getting a lean code it's highly unlikely it's a misfire. Given the fact that it was a sudden onset, give a look at the MAF, they have a tendency to run out of range values when failing, but not so out of range that they throw a code. Usually you can unplug them and run the vehicle to see if the issue gets better, as the ECU will ignore the MAF readings and go to a default air flow table or so called limp mode.
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post #5 of 6 (permalink) Old 10-02-2019, 07:30 PM
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Also, not sure on your '09' if you had to pull the intake for the plugs & coils, on my wife's '12' I don't. But it is possible you have a massive vacuum leak from the intake if you did and didn't replace the gasket or perhaps didn't have it seated correctly.
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post #6 of 6 (permalink) Old Today, 04:08 AM
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