Check engine keeps turning on and code PO144

GERRYBARTZ

MEMBER
2004 CHEVROLET SILVERADO
0.6L
V8
4WD
AUTOMATIC
12,500 MILES

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.

3 Replies

JACOBANDNICKOLAS

MECHANIC
108,179 POSTS

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

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Sunday, May 10th, 2020 AT 8:11 PM

GERRYBARTZ

MEMBER
2 POSTS
2004 CHEVROLET SILVERADO
0.6L
V8
4WD
AUTOMATIC
125,000 MILES

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.

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Monday, May 11th, 2020 AT 11:30 AM (Merged)