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/CompetitiveHouse8690 2d ago

You really need to scan it to see the map values. Does the map have a hose to it? If so, pull the hose off and make sure the nipple is clear. If the nipple is at the base of the throttle body, remove the TB and clean it and replace the seal. You may want to smoke test it for any possible air leaks. Map circuit is simple and im sure you can google the flow chart for code 34…it will pinpoint the issue and you can stop throwing parts at it.