Fluttery Noise
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Thread: Fluttery Noise

  1. #1
    Fellow Frogger!
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    Fluttery Noise

    Ever since i got my 505, there has been a "fluttering" sorta noise that seems to come from the exhaust manifold side of the engine.
    It's more obvius when the engine is cold, but other than an annoying noise, the engine runs well.
    The Exhaust pipes and mufflers were replaced and the exahaust manifold was inspected recently by Bob Watson Service Centre, (by previous owner) and no problems were found.
    Idea??

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    Jason Judd
    <img border="0" alt="[Peugeot Emblem]" title="" src="graemlins/peugeot.gif" /> '85 505 GTi Executive
    <img border="0" alt="[Peugeot Emblem]" title="" src="graemlins/peugeot.gif" /> '88 205 GL 1.1

  2. #2
    Administrator GreenBlood's Avatar
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    Jason,
    My guess is a leak at the exhaust manifold, check to see if your manifold bolts are done up tightly when the engine is cold.

    As the manifold warms up exhaust leaks close off with the expansion, hense you are only hearing it when engine is cold.

    Cheers
    Chris
    74 D(very Special) >>Rejuvenation Thread<<
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  3. #3
    Fellow Frogger!
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    Well, thats what i thought at first. I'll have another look in the daylight tommorow. Still...
    I dont think it is the manifold, judging by the volume of the sound...
    Jason Judd
    <img border="0" alt="[Peugeot Emblem]" title="" src="graemlins/peugeot.gif" /> '85 505 GTi Executive
    <img border="0" alt="[Peugeot Emblem]" title="" src="graemlins/peugeot.gif" /> '88 205 GL 1.1

  4. #4
    1000+ Posts Rod Hagen's Avatar
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    Sounds like an exhaust manifold or flange gasket to me too.

    Another possibility is a hairline crack in the manifold or the downpipe flange welds (505's are rather prone to this and replacements can be expensive).

    Check the tension on all the relevant studs (head to manifold and manifold to downpipe) with the engine cold , but don't put herculean pressure on the wrench. You can sheer off the studs or crack the manifold if you aren't careful.

    You can often 'feel" a leak on you hand, but don't get burnt! These bits gets hellishly hot.

    Cheers

    Rod
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  5. #5
    Fellow Frogger!
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    Well, i'm gonna go out now and have a look....
    Jason Judd
    <img border="0" alt="[Peugeot Emblem]" title="" src="graemlins/peugeot.gif" /> '85 505 GTi Executive
    <img border="0" alt="[Peugeot Emblem]" title="" src="graemlins/peugeot.gif" /> '88 205 GL 1.1

  6. #6
    Fellow Frogger!
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    Tis without a doubt the Exhaust manifold, were it is bolted to the engine. At the top end i would say.
    Problem is i wouldnt have a clue what to do about it
    Jason Judd
    <img border="0" alt="[Peugeot Emblem]" title="" src="graemlins/peugeot.gif" /> '85 505 GTi Executive
    <img border="0" alt="[Peugeot Emblem]" title="" src="graemlins/peugeot.gif" /> '88 205 GL 1.1

  7. #7
    1000+ Posts Rod Hagen's Avatar
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    First try simply tightening the nuts Jason (with the engine cold) . If this doesn't fix the problem its a matter of removing the manifold and replacing the cylinder head to manifold gaskets. This is fiddly, but not difficult.

    Its a good idea to fix it, because you increase the risk of having the manifold crack due to uneven tension if one gasket is disintegrating. It can also affect performance to some extent, because of its effect on the readings from the O2 sensor etc.

    Cheers

    Rod
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  8. #8
    Fellow Frogger!
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    Just an update:
    Yesterday, i took out the aicleaner, and had a closer look at the manifold. Many of the bolts were finger-tigh, and one of the studs from the head was missing altoghthere.
    I tightened all the bolts, and removed the EGR valve to tighten the bolts underneath. I also found the EGR valve (which was always very noisy) was not working, so i made a gasket to block it off
    Anyway... Put it all back together, and now i have a car that is far quieter, smoother and pulls away from the lights faster
    Thanks
    Jason Judd
    <img border="0" alt="[Peugeot Emblem]" title="" src="graemlins/peugeot.gif" /> '85 505 GTi Executive
    <img border="0" alt="[Peugeot Emblem]" title="" src="graemlins/peugeot.gif" /> '88 205 GL 1.1

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