Check engine keeps turning on, and code po144

2004 CHEVROLET SILVERADO
12,500 MILES • 0.6L • V8 • 4WD • AUTOMATIC
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GERRYBARTZ
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Have replace all 4 senors, fix exhaust leaks, new manifolds, new plugs. keep coming up all banks. the one code I remember is po144. I can clear them and about 2 day later back again and it always comes on when I start the truck not while driving. do a lot of short trips. when I clear it and go on a long trip it's fine. It did have a knock senor code once, but has not came back put a bigger battery in. told computer maybe low on power as I replace battery with what was told to put in first time now a 900 ca tied of codes some time it idles rough.
May 10, 2020 at 5:34 AM
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JACOBANDNICKOLAS
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Hi,

The code is somewhat generic in content. Basically, there is high voltage to bank once sensor 3. When the voltage from the sensor is extremely high, that indicates a rich fuel condition (air/fuel mixture). Now, since you replaced the sensors already, we need to move on.

There are two things I want to start with. First, if you have a live data scanner, I need to know two things. First, what is the short term fuel trims (STFT) and I also want you to check the engine coolant temp sensor reading. You need a scanner to do it or we need to remove the sensor and check resistance.

Let me know if that is something you can do. I am questioning if there is a short to power or there is a rich fuel mixture related issue on bank 1 which could be the result of a high fuel pressure issue (pressure regulator failure) or even a leaking injector.

Let me know.

Joe
May 10, 2020 at 8:11 PM
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GERRYBARTZ
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Check engine keeps popping up. changed all 4 02 senors, fixed exhaust leak, replaced manifold, all new plugs. I clear codes and they come back about two days later. does not happen while drive it's always when I start it the next day. plus I do a lot of short trips. If I do a long trip it doesn't come on as of yet,
May 11, 2020 at 11:30 AM (Merged)
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ASEMASTER6371
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Good morning,

The possibility of all 4 sensors failing together is very slim.

Let us start with the actual codes you were chasing.

https://www.2carpros.com/articles/how-an-oxygen-sensor-works

https://www.2carpros.com/articles/how-to-test-an-oxygen-sensor-02-sensor

Roy
May 11, 2020 at 11:30 AM (Merged)