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

Need help with a code 33 (MAF)

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Old May 30, 2007 | 03:55 PM
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Default Need help with a code 33 (MAF)

1986 Automatic

I recently swapped out a bad thermostat. Four days later I get a strong smell of fuel and a ses light with a code 33. She won't idle now.

Also, I have noticed over the last month a humming/whistling noise coming from aft cabin - I can't locate the sound but maybe its the fuel pump?

Vac hoses and wiring to MAF look good...however I was working in that viscinity when I did the stat last weekend.

Can anyone put all these "clues" together for me?

Thanks in advance

Last edited by redvette1986; May 30, 2007 at 03:58 PM.
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Old May 30, 2007 | 04:04 PM
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Unplug the MAF and see if it runs better. The whirrling noise behind the drivers seat is the ABS system. At 5 MPH after start up it runs and tests. You should hear it if you really jam the brakes as well.
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Old May 30, 2007 | 04:26 PM
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Thank AGENT 86 for this link.

http://members.shaw.ca/corvette86/Code%2033.pdf
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Old Jun 1, 2007 | 04:01 PM
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Thanks, I will get my fingernails dirty this weekend...
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Old Jun 4, 2007 | 04:50 PM
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Originally Posted by Aardwolf
Unplug the MAF and see if it runs better.
Ok, I unplugged the maf (while running) and there was no difference at all...now what?
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Old Jun 4, 2007 | 05:44 PM
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Maybe you have bad relays??
Maf Burn Off or Power relays
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Old Jun 4, 2007 | 09:37 PM
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Originally Posted by RRT vette
Follow the flow chart in the link.
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Old Jun 4, 2007 | 11:13 PM
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Sounds like the relays. The good news is that they are only about $11.00 a piece. Mine has idled just great since I changed them.
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