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Help with Trouble Codes for an 87

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Old Feb 18, 2003 | 10:26 PM
  #1  
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Default Help with Trouble Codes for an 87

Service engine light turned on three times on me today in the morning on my way to work. And once coming home. Here are the codes 24, 34, 36. I know I had a 36 code for a while and I needed to replace the burn off relays but I have three manuals telling me three different things for codes 24 and 34. Can anyone help? Are codes 24 and 34 a direct correlation to the fact that I have not fixed code 36 the burn off relays?

Oh one last thing, I really need to drive the car to work in the rest of the week as the daily driver is out of commission until Saturday, do you all think I can still drive it until then or find some other way until I get at least the relays?

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Old Feb 18, 2003 | 10:36 PM
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Default Re: Help with Trouble Codes for an 87 (My87)

Here's a link for codes

http://www.c4vettes.com/ecm.htm
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Old Feb 18, 2003 | 10:45 PM
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Default Re: Help with Trouble Codes for an 87 (jimswhite92)

Thanks,, now the stupid questions how hard is it to fix

24 Vehicle Speed Sensor (VSS)

34 Mass Air Flow Circuit (1985-1990)

36 Mass Air Flow Burn Off Circuit --

I take it 36 is the burn off relay so 34 and 36 should be the same thing right?
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Old Feb 19, 2003 | 06:26 AM
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Default Re: Help with Trouble Codes for an 87 (My87)

Ok was hoping someone would let me know but I guess I am going to have to take a chance on the car.
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Old Feb 19, 2003 | 07:30 AM
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Default Re: Help with Trouble Codes for an 87 (My87)

I would start with both relays they are cheap enough. My faulty MAF was causing hesitation, sputtering etc. when mine was on its way out but still tripped no codes.
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Old Feb 19, 2003 | 05:38 PM
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Default Re: Help with Trouble Codes for an 87 (chucks88)

:iagree: Start with the MAF relays on the firewall behind the battery. They are only $20 for both and the MAF is $160 for a backordered used one from ZIP.


[Modified by castivers, 5:39 PM 2/19/2003]
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Old Feb 19, 2003 | 05:48 PM
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Default Re: Help with Trouble Codes for an 87 (castivers)

In my experience with my '87, there doesn't seem to be any correlation between a code 36 and code 34. I have had a bad MAF burnoff relay for 3-1/2 years (yes, I'm just too lazy to fix it) and have only gotten a code 34 when the MAF was actually bad.
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Old Feb 19, 2003 | 06:23 PM
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Default Re: Help with Trouble Codes for an 87 (My87)

Welcome to the 30something club. Seems pretty popular and tough to fix. I had all the codes you listed except for the 24. I replaced everything that touched the MAF and still have an intermittant 33. I haven't had it for a few days but I know it will come back to visit.

If your not going into limp-home mode, I'd drive it until you have time to fix.
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Old Feb 19, 2003 | 11:04 PM
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Default Re: Help with Trouble Codes for an 87 (My87)

Thanks to all, I will change the relays and see what happens. My dealer charges $18 for each but better than $150 for the MAF. I will let you all know if it gets fixed.

One last dumb one for the road. When I replace them should I disconnect the negative from the battery so that it resets itself? Or just plug new ones and drive?




[Modified by My87, 4:05 AM 2/20/2003]
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Old Feb 20, 2003 | 02:00 AM
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Default Re: Help with Trouble Codes for an 87 (My87)

I disconnect my neg terminal for anything I touch under the hood. It's a good habit to get into :yesnod:
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Old Feb 21, 2003 | 07:21 PM
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Default Re: Help with Trouble Codes for an 87 (My87)

OK guys put in the new relays and codes 34 and 36 disappeared but code 24 is still shooting out. I looked it up and it tells me it is "24 Vehicle Speed Sensor (VSS) or circuit" if this is true were in the hell is this sensor? Thanks

:confused:
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Old Feb 21, 2003 | 08:26 PM
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Default Re: Help with Trouble Codes for an 87 (My87)

My book shows the speed sensor on an 87 at the far back / left of the transmission.
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