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Apr 21, 2002 | 10:18 PM

DADDY D

Thread Starter

Racer

Joined: Jun 2001

Posts: 335

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From: MANTEO NC USA

code 33

what is code 33 and how do you fix it

Apr 21, 2002 | 10:52 PM

Sam Lam

Melting Slicks

Joined: Apr 2002

Posts: 2,118

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From: St. Charles, MO Route 66 Corvette Club

Re: code 33 (DADDY D)

Daddy D: According to my 89 GM service manual for Vetts, code 33 is set when the Mass Air Flow reading (grams/second) is above the upper limit programed in the ECM. It probably indicates you need a new MAF sensor. You should check the pocket book as this "ain't" cheap. My experience has been to stick to GM parts when you replace sensors. You might disconnect one battery terminal for about a minute and then reconnect. This will clear the codes for early C4s. Run the Vette and see if you get a 33 again. If you continue to get the 33, you have a problem!!!

Regards, Sam

Apr 21, 2002 | 11:44 PM

DADDY D

Thread Starter

Racer

Joined: Jun 2001

Posts: 335

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From: MANTEO NC USA

Re: code 33 (Sam Lam)

well i have two of them one is an aftermarket brought from the parts store which i use for when i am going to spray my n2o dry shot because i am scared i am going to ruin the orignal

Apr 22, 2002 | 12:18 AM

vett4cw

Instructor

Joined: Jan 2001

Posts: 126

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From: Murrieta, CA

Re: code 33 (DADDY D)

Yes, a code 33 is usually the MAF... however, it can also be the ECM or a wiring short. I have a very good shop manual (actually Chevrolet) that leads you through a thorough test of the circuits that affect code 33. If you are still in need, give me a holler and I will scan and send to you.

I just came off of a code 33 error myself... turned out to be a loose connection at the ECM (connector AB)... the shop manual flow diagram pinpointed the problem quite nicely... no code 33 no $550.00 for a new MAF

Charles (csandjw@pe.net)