jerky start-up and a lot of smoke?

2008 CHEVROLET TRAILBLAZER
194,000 MILES • 6 CYL • 4WD • AUTOMATIC
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HISHAM200974
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jerky start-up and a lot of smoke comes out from the exhaust for 5 minutes. plus, a temperature meter up and down and RPMs up when the temperature meter is reading 0. note, that I have some code like p0411 and note that last year I changed the temperature sensor and thermostat.
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Feb 12, 2023 at 3:08 AM
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So, the p0411 code is for the air injector system for incorrect flow. This is to aid the emissions system so I don't think this will make the engine run poorly at start up. I have seen a sticking fuel injector load a cylinder up with fuel after the engine is shut off. I would remove the spark plugs and look for one that is different than the rest (black/soot) is the cylinder have the problem. Here is a generic guide on how to remove the spark plugs and how it is done on your car in the images below.

https://www.2carpros.com/articles/how-to-change-spark-plugs

If you want to replace them here is the type

Spark Plug Type .................... GM P/N 12569190


Check out the images (below). Please let us know what happens and please start a new thread on the p0411 code.
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Feb 12, 2023 at 12:20 PM