L-98 Code 30

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Mar 14, 2009 | 07:57 PM

tdf

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Instructor

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From: Elk Plain WA

St. Jude Donor '11

L-98 Code 30

My 1986 L-98 is starting poorly and throwing a Code 30 (Intermittent MAF Issue per my manual). Edited: It was a Code 33.....sorry!

Does this mean I need a new MAF or could this be a wiring issue or something simple like that?

Anyone experience a similar failure and what was it?

I removed the Plenum from both sides of the MAF. There was some leafy debrie on the intake side that had gotten past the Air filter somehow. I blew that out, but it didn't help any that I can see.

Need some advice here please......Thank You

Last edited by tdf; Mar 15, 2009 at 11:51 AM. Reason: Error- was Code 33 not 30

Mar 15, 2009 | 08:25 AM

AGENT 86

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From: Summerland B.C. Canada

There is no code 30.
Here are diagnostics for the MAF codes.

http://members.shaw.ca/corvette86/Code%2033.pdf

http://members.shaw.ca/corvette86/Code%2034.pdf

http://members.shaw.ca/corvette86/Code%2036.pdf

Mar 15, 2009 | 11:18 AM

tdf

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From: Elk Plain WA

St. Jude Donor '11

Wrong Interpretation of Flashing Light

Quote:

Originally Posted by AGENT 86

I'll try shorting the pins and reading the codes again....I don't have a reader......now I'm thinking it must have been a Code 33. Appreciate the help there Agent86!

Mar 15, 2009 | 11:47 AM

tdf

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From: Elk Plain WA

St. Jude Donor '11

Codes Re-read

Now I have a Code 33 and Code 34. Will run through the doiagnostic procedure as soon as I can. Thanks Again.

Mar 19, 2009 | 07:36 PM

1986coupe

Burning Brakes

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From: Niagara Falls ON

I had the same thing once with a TPI Camaro. Check the injectors to see if they are working right. If there is no problem with the injectors then focus on the MAF.

Mar 19, 2009 | 08:04 PM

engle1147

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From: Tampa Florida

Take a close look inside the MAF sensor and see if the platnum filament is still intact. If the filament is still intact check/clean the connector connections that plug into the MAF sensor. Replace the MAF relays (power and burn off) located beside the brake booster. Clear the stored ECM trouble codes and restart the car to see if your still having a hard start & or a trouble code problem. If you still having a problem pick up of spray MAF cleaner at your local autoparts store and clean the inside of the sensor as directed.

Replace the MAF sensor if the steps above show no improvement or if sensor's filament is broken/missing....it is always a good idea to replace the MAF burn off relay when installing a new MAF sensor.

Mar 20, 2009 | 12:22 PM

tdf

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From: Elk Plain WA

St. Jude Donor '11

Diagonotics

I ran the diagnostics for the Code 33 using the procedure provided, and the results pointed to the MAF Burn Off Relay or the ECM.

I purchased and installed a new relay. So far, that seems to have fixed the issue. Starts and runs and no longer throwing codes.

WIll post again if it the issue comes back; a possibity since this has been an intermitent issue.

Mar 21, 2009 | 08:23 AM

jackdaroofer

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From: Almost all Skyline Cruises Vettes at Waterside 1-5

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Quote:

Originally Posted by tdf

WIll post again if it the issue comes back; a possibity since this has been an intermitent issue.

Based on similar past experience and the advice of C4 guru Gorden Killebrew, both MAF relays should be replaced at same time when one goes bad. I went through two or three relays a few years ago until I did ths. Fortunately they are cheap and easy to get to.