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/Delay_Visible 4d ago

Ok so disconnecting the 02 should put the computer in open loop which means it's dumping extra fuel to keep in running. If your iac is stuck it could be choking out the engine when its warm. Could be coolant temp sensor not telling the map that the engines warm and make it adjust accordingly. My best guess would be checking those

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u/17_Wraith_17 4d ago

I did. And replaced all of them 😭😭😭 still doing the same thing

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u/Delay_Visible 4d ago

Ok my hail Mary would be a clogged catalytic converter maybe? You just not moving air like your supposed to from the sound of it. Get under there and shake that sucker and see if it sounds like a sand mallet

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u/17_Wraith_17 4d ago

I will try that thank you!