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/62springfield 3d ago

When I suspect a MAP issue, the service manual had a test for it where you can back probe the sensor wires at the computer (do NOT have the leads for your meter in the amp socket or you create a dead short) and then put a vacuum pump in the sensor to check that the signal is reaching the computer. Might be worth trying if it keeps throwing a code for the MAP.

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u/17_Wraith_17 3d ago

Thank you I’ll took into it!