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Trouble Code 44 GM TBI?

P

Philly87

1/2 ton status
Joined
Jul 14, 2000
Posts
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Location
El Paso, TX
I was being stupid and ran my Blazer wide open for a few miles and now my motor is missing and shaking. It gives me a code 44 which is lean O2 sensor...

Any ideas? I'm so pissed at myself that I don't even know where to start.

Thanks,
Phil
 
Thanks for the info. Fuel pump was the first thing that went through my mind. I hate pulling the tank! I guess now would be a good time to knock the big dent out of the tank too if it is a pump.

Thanks again.
 
do you not have a skid plate covering your fuel tank? it's usually a factory item i am sure in the latter years, not sure about earlier ones.
 
I do have a skid plate over the tank. Funny story; when I blew up the 10 bolt rear for the last time I had to move the truck and the axles were falling out so we decided to move it in 4WD with a floor jack under the rear.

Needless to say it fell off and wedged the jack between the ground and the tank. It's been like that for about 5 years now with no issues.
 
I would replace the 02 sensor (they do go bad over time) and then see where you're at. If the engine still is misfiring i would then do a compression test and see the results of that before going any further.
 
Scott,

What are you thinking? Loss of cylinder pressure due to what? The truck has dual exhaust and I know the missfire is coming from the drivers side bank. Cyl. 1,3,5 or 7

There is no excessive smoke coming from the exhaust on that bank so I'm just curious what your thoughts are. Cracked piston or one with a hole in it due to detonation? I didn't hear any rattleing coming from the motor.

Thanks,
Phil
 
Could be a burned valve or a valve seat that is starting to get beat in (this usually happens to the exhaust seat). This can happen all of a sudden with no notice (happened to my old engine).
 
Will a burnt valve show drastic loss of compression when compared to other cylinders? This is a 9.6:1 GM crate with a hydraulic roller swap and 1.6 roller rockers. The motor is about 6 years old but has less than 30K miles on it.
 
For a reference my compression test was 190 on all cylinders except the one in question which was 70 psi yes a significant difference.
 
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Pull each plug wire one at a time on that side until you find your dead cyl. Run a compression check.
 
I tried pulling plug wire by plug wire and heard no change in the tone of the motor. I think first things first I'm gonna pull the cap, rotor, wires and plugs and replace all that and see what it does.

If it still sounds bad then I'll run the compression check.
 
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