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Thread: Foul smell from my exhaust V8 4.0

  1. 31st August 2017, 12:12 PM #1
    flatpack
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    Foul smell from my exhaust V8 4.0

    Recently my exhaust fumes have started smelling really bad. Car runs fine, fuel economy is the same, just the smell is awful. Any ideas?
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  2. 31st August 2017, 02:49 PM #2
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    Bohica
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    A sulphur, rotten egg type smell?
    Could be the catalytic converter is on its way out.
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  3. 31st August 2017, 03:25 PM #3
    flatpack
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    Quote Originally Posted by Bohica View Post
    A sulphur, rotten egg type smell?
    Could be the catalytic converter is on its way out.
    I had one of the cats welded up as it was splitting. What difference is this going to make, if any?
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  4. 31st August 2017, 08:01 PM #4
    Mickyg
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    O2 sensors

    I didn't want to suggest this but it may not make much difference to performance, but put a obd2 device on it and check to see for o2 faults?
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  5. 1st September 2017, 06:31 AM #5
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    O2's are before the cats,, so no power degradation from split cat,,

    have you changed fuel suppliers?
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  6. 1st September 2017, 08:20 AM #6
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    Welding a split cat could have destroyed/damaged the core thus resulting in emissions of H2S.
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  7. 1st September 2017, 09:34 AM #7
    flatpack
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    Thanks for the replys guys.

    I have a nanocom and one of the co2 sensors is not sending a signal. They are before the cats so I haven't bothered with it. Looks like a new (2nd hand) downpipe for me.
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