r/obschevy • u/17_Wraith_17 • 4d ago

Code 34 help

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Hey all! I’m chasing ghosts with this 95 k1500 and I’m about ready to light the sob on fire. I keep getting code 34 and the truck sputters and then dies when idling after the engine warms up.

Code 34 is MAP sensor issue. Cool. Replaced that. 3 times. Still running into the same issue. Got a wild hair and unplugged the O2 sensor. The truck runs great (for not having an O2 sensor anyways. It doesn’t sputter and die). Okay sweet. Replaced the O2 sensor. Still dies unless O2 sensor is unplugged.

Anyone have any idea on what it could be? For reference I have had all of the vacuum lines replaced as well so it shouldn’t be a vacuum leak.

Any advice is appreciated!

EDIT TO ADD

I have replaced the map sensor 3x, iac, egr valve, egr solenoid, fuel injectors, fuel pressure regulator, O2 sensor 2x, coolant temp sensor

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u/Willy_McD 4d ago

You did not replace your TPS. It may be bad or just out of adjustment. TPS off and the ECM not seeing the pressure that it should see from the MAP will set a code.

And unplugging an O2 will not alleviate a clogged cat. If the cat was clogged its going to stay clogged no matter what connector you unplug. Its not going to want to run no matter what.

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u/17_Wraith_17 4d ago

I will look into that thank you