C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

False SES Code 34

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Old Nov 10, 2010 | 12:01 AM
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Default False SES Code 34

86 Stock
Can a bad brake booster trigger a maf code on the ses light, I have a engine surge and a bad brake booster, I am getting a code 34 (maf). I replaced the relays and swapped out the maf for a good one reset the codes and it still comes back. I'm guessing the surge could be due to the bad booster but can that also throw a false Maf code?
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Old Nov 10, 2010 | 12:22 PM
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If you don't have access to a FSM, you could disconnect and plug the vacuum line to the booster to see if the code resets. If you drive the car like this, be prepared for a non-power assisted, hard pedal.
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Old Nov 10, 2010 | 03:23 PM
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An unmetered air source could cause a 34. Plug it, clear the code and see if it returns.

http://members.shaw.ca/corvette86/Code%2034.pdf
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Old Nov 14, 2010 | 02:45 PM
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Originally Posted by AGENT 86

An unmetered air source could cause a 34. Plug it, clear the code and see if it returns.

http://members.shaw.ca/corvette86/Code%2034.pdf
Plugged the line and the surge went away.. Cleared the codes and 34 came back.
At least now I know the booster is causing the surge, Now to figure out the 34. changing the relays and maf did not help
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Old Nov 14, 2010 | 03:26 PM
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Maybe someone with a 1986 FSM can help you with the fault diagnosis tree. Anyone out there?
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Old Nov 14, 2010 | 03:48 PM
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:o
Originally Posted by CorvetteMike2004
Agent 86 posted up already what you are asking for. If you are not familiar with Agent 86, you should check the link when he posts up.
Agent 86 has helped me many many times. He gives rock solid advice.

BTW...Agent 86.. Can you look at my abs thread in c4 tech?

Mike
:o My apologies, Agent 86. Mike is right, I missed your link.
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