850 - rattly, diesel engine type sound when cold

Discussion in 'Volvo 850' started by han_chung, Jan 11, 2006.

  1. han_chung

    han_chung Guest


    My '97 850 has a rattly, almost diesel engine like sound when driven
    cold. This lasts for about 2-3 minutes and only occurs when I am
    stepping on the accelerator.

    Has anyone encountered this?

    han_chung, Jan 11, 2006
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  2. han_chung

    James Sweet Guest

    My first guess would be an exhaust manifold leak.
    James Sweet, Jan 11, 2006
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  3. Han, it's more likely to be an exhaust manifold gasket, which has about
    a 10-year life, than the exhaust itself. Get a shop to confirm this.
    If it is the gasket, the part costs next to nothing. You don't even
    have to be very mechanical to fix it. Just remove the nuts to release
    the exhaust manifold, remove the old gasket and any remnants (thorough
    clean), fit the new gasket and re-fix. You ought to be able to swing
    the manifold off the catalytic converter rather than removing both ends
    if you can find something to prop it.

    The most likely problem to encounter is that you can't release all of
    the nuts (because of corrosion), in which case you'll have to re-fix
    everything you just took off and take it down to the shop anyway.

    Don't be alarmed by the noise if it is the gasket, it's only what a
    motor really sounds like.



    <--- Remove The NO and SPAM When Replying --->
    Andrew McKenna, Jan 11, 2006
  4. han_chung

    han_chung Guest

    Thanks everyone, I think you might be spot on as the muffler itself is
    showing signs of rust.


    han_chung, Jan 11, 2006
  5. han_chung

    K Bourke Guest

    I had put 278,000km on my 1993 854 (before someone smashed into *me*), all
    with the ORIGINAL exhaust, save for one of these manifold gaskets...... now
    *that's* OEM parts....

    K Bourke, Jan 12, 2006
  6. han_chung

    James Sweet Guest

    I would check the exhaust manifold gaskets first, they usually leak
    worse when cold when they go bad.
    James Sweet, Jan 12, 2006
  7. han_chung

    Mike F Guest

    If it's the 10 valve version, it's more likely to be a broken weld on
    the exhaust manifold where it meets the front pipe.

    Mike F.
    Thornhill (near Toronto), Ont.

    Replace tt with t (twice!) and remove parentheses to email me directly.
    (But I check the newsgroup more often than this email address.)
    Mike F, Jan 12, 2006
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