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Trouble codes and rotten egg smell from exhaust

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by EZdoesit, Jun 11, 2002.

  1. EZdoesit

    EZdoesit Registered Member

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    Well for about the last week the check engine light has been coming on in my 87 blazer, it is a 305 TBI. It only comes on when I am cruising down the freeway for about 10-15 minutes and sometimes I can smell a really nasty sulfuric rotten-egg smell from the exhaust. I stuck a paperclip in the diagnostic port to flash the codes when I got to work this morning and I got a 12 and a 32.
    Any ideas about what it could be? I went to an online trouble code library and

    code 12 is no signal to ECM
    code 32 is EGR
     
  2. 74k5inVA

    74k5inVA 1/2 ton status

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    i'm no expert but i would replace the EGR.
     
  3. BillyBob

    BillyBob 1/2 ton status

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    The nasty "egg" smell usually means that your catalytic converter has bit the dust.
     
  4. EZdoesit

    EZdoesit Registered Member

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    Ok cool, we have no emmission testing in MN so I'll just remove my cat, I'll have to find out if there is some way to test the EGR to see if it is bad for sure, or maybe just disconnect it
     
  5. Burbinator

    Burbinator 1/2 ton status

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    Code 12 is a handshake code, NOT a trouble code...
     
  6. DPI

    DPI 1/2 ton status

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    This is probably not related to your problem, but a rotten egg smell is also an indication of the battery overcharging...
     
  7. EZdoesit

    EZdoesit Registered Member

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    Battery is fine, 14 volts at idle
     
  8. MudFrog

    MudFrog 1/2 ton status

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    Ok... mine did the same thing. Except I had a code 43. At first it seemed like the check engine light would only come on during highway use but I found it just waited for the engine to warm up. Do you hear any real bad pinging before the light comes on? The fix for me was to replace the knock sensor. The engine would warm up, then ping, then the check engine light came on followed by the hideous smell.
    Just a thought.
     
  9. Chris Demartini

    Chris Demartini 1/2 ton status

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    </font><blockquote><font class="small">In reply to:</font><hr />
    Code 12 is a handshake code, NOT a trouble code...

    [/ QUOTE ]

    <font color="blue">Code 12 also means no distributor reference signal.

    I had a code 32 and it was the EGR vavle. The diapragm in the EGR valve should move up and down, so if it sticks you need a new one. A new EGR is $70 usually. After I replaced mine I found a good one in my TPI parts pile /forums/images/icons/tongue.gif so if you need an EGR let me know. </font color>
     
  10. Burbinator

    Burbinator 1/2 ton status

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    You are correct...

    ...I meant that it USUALLY isn't a trouble code. Damn GM!

    /forums/images/icons/smile.gif
     

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