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Very strong exhaust smell following timing belt change

Home-org Forums Nuts & Bolts Tinkering Very strong exhaust smell following timing belt change

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    • Spectator

    I’m a bit baffled on this one and could use some advice/ideas.

    Short version:  Season before last I changed the timing belt, water pump etc.. and ran great after being put back together.  Developed a screech I couldn’t identify and eventually brought it into Mazda last year.  They diagnosed as a faulty water pump (which I bought from Mazda).  Screech is gone but car has very strong exhaust smell (not rotten eggs) now, worse at startup but never really goes away.  No codes, changed the O2 sensor, double checked timing marks (have it set at 12 degrees) and installed new plugs.   Is it possible the timing belt is off by a tooth?  Car runs good, has power and haven’t noticed poor fuel economy. Just took it out of storage this past weekend so I’m going to burn through the fuel as I have stabilizer in it and see if that helps.

    Any other thoughts?

     

    Stosh  (Brookfield CT)

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    • Pro
    • ★★★★

    Stosh,

    Is the smell at the engine, in the cabin, or at the exhaust? My first thought would be just burning off spilled fluids, exhaust smell in the cabin is sometimes a disintegrating shifter boot. Burn through that tank and report back.

    Dave

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    • Spectator

    Dave, thanks for the input.  I think it is from the exhaust, don’t smell it in the cabin.   I rebuilt the shifter a couple years ago and replaced the boots but I’ll double check.   Will burn through the tank and see if it improves.  Unfortunately snow tomorrow but hope to get out this weekend.

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