Thread: Code p0300 misfire caused by cat?

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  1. #1 Code p0300 misfire caused by cat? 
    randywalsh
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    Default 09-04-2011
    I read a post about a clogged cat. Is there a way to check?
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  2. #2 Re: Code p0300 misfire caused by cat? 
    Explicit_Spade
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    Default 09-04-2011
    Misfires are usually spark related.

    Your cat can get clogged. If you search, there are quite a few threads on that.
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  3. #3 Re: Code p0300 misfire caused by cat? 
    dsmuts
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    Default 09-04-2011
    Pull the upstream O2 out and put a pressure gauge in it and see if it has any pressure. Shouldn't have more than 1-2 psi
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  4. #4 Re: Code p0300 misfire caused by cat? 
    TheOtherNick
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    Default 09-05-2011
    Just pull the up stream 02 and go for a drive and see if the miss goes away.
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