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Black smoke on startup

This is a discussion on Black smoke on startup within the New Member Introductions forums, part of the Site Feedback / Administrative Requests category; Hi Guys, Im new to this site. I have an LS1 GTO. On startup during the engine being semi warm ...

  1. #1
    Junior Member
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    Feb 2006
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    Australia
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    VT Commodore

    Exclamation Black smoke on startup

    Hi Guys,

    Im new to this site.
    I have an LS1 GTO. On startup during the engine being semi warm the engine makes a pinging sound followed by a puff of black smoke. It occurs when I take it for a drive, switch it off and let it sit for 30mins to an hour.

    Cold starting the problem is not present.
    Hot starting the problem is not present.
    Starting the engine a second time after the problem has occurred above - problem not present.

    Could it be a Coolant Temp sensor? O2 sensor problem? Maf?

    Any help is greatly appreciated.

    Thanks.

  2. #2
    Senior Member GOT1GOAT's Avatar
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    Sep 2006
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    Newcastle,De.
    Age
    62
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    1,048

    04 GTO QuickSilver
    95 MarkVIII wifey white

    Dont know but might be a catylitic converter prob. At my work, theres a van that did that and it was the cat. Have it checked out and good luck. Oh, and Welcome Oz
    04/A4 Quicksilver
    Magnflow catback-Resonator delete
    K&N drop in
    SAP front Grills and 05 hood
    Limo tinted windows-Gets me pulled over alot
    Diablosport Predator (RWTD) tune.

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