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

Code 33 and Code 34

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Old Jun 8, 2025 | 12:01 AM
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Default Code 33 and Code 34

My engine in my '89 started running rough on idle and shaking a little.
I pulled codes 33,34. First error codes I've encountered since owning this car.
Is there a simple way to determine whether the issue is with the relays or the MAF?

If it is the MAF, has anyone tried a Spectre MA-157?
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Old Jun 8, 2025 | 07:47 AM
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Never had to deal with either of those codes, so all I can add is some info from my manual.




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Old Jun 8, 2025 | 10:49 AM
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If you follow the procedure above and find it is the MAF, its good practice to replace both relays along with it.
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Old Jun 8, 2025 | 01:27 PM
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I have the manual. I guess I should use it,,,,all the time. I also have the Parts Manual, in case anybody needs info out of that.
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Old Jun 8, 2025 | 01:36 PM
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I purchased two used known good relays (always good to have a couple lying around).
So, time to get to work (while I'm fixing my right headlight, the coolant drip, retorque my aluminum trans pan )
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Old Jun 15, 2025 | 02:14 AM
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Well, it wasn't the MAF. It was the relays. Codes gone. Car running fine.
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