BX 16V motor noise
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  1. #1
    Fellow Frogger!
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    Default BX 16V motor noise

    Hi all,

    Following the failure of the alternator on Friday night I have just 'finished' replacing it, and with everything back together the motor is making an odd noise at anything much above idle - half scream/half whistle. This is accompanied by the engine light coming on after about a minute of running.

    To my ear the noise is coming from around the distributor cap, although it could also be where the manifold meets the motor.

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    Has anyone suffered anything similar?

  2. #2
    Administrator GreenBlood's Avatar
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    Quote Originally Posted by LeRob View Post
    Hi all,

    Following the failure of the alternator on Friday night I have just 'finished' replacing it, and with everything back together the motor is making an odd noise at anything much above idle - half scream/half whistle. This is accompanied by the engine light coming on after about a minute of running.

    To my ear the noise is coming from around the distributor cap, although it could also be where the manifold meets the motor.

    Has anyone suffered anything similar?
    Is the aux belt nice and tight after fitting the alternator? Sometimes hard to pick where noise is coming from but that's where I'd be looking.

    Cheers
    Chris
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  3. #3
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    Hi Chris,

    The belt is very tight - I originally thought it might be a belt rubbing on a plastic guard, but eliminated that. The noise is definitely coming from the distributor cap area. In the absence of other suggestions I will check the rotor button tomorrow as I have had that come loose once upon a time.

  4. #4
    Fellow Frogger! renault12's Avatar
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    Not impossible that it's a leaky inlet manifold gasket.. They make a noise like this. If it disappears when you open the throttle half way or more, that's where I'd be looking.

    Unlikely that it'd leak if you haven't disturbed the manifold though..

  5. #5
    Fellow Frogger! Mungous's Avatar
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    I assume you've removed the alternator belt and run it to confirm nothing is wrong at that end..?

  6. #6
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    Thanks for the replies - the prize goes to R12 (sort of) with an intake leak caused by not doing up the manifold bolts quite as much as necessary. I imagine the engine light was because of a discrepancy between the readings of the air flow sensor and lambda sensor.

    Cheers

    Rob

  7. #7
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    Quote Originally Posted by LeRob View Post
    Thanks for the replies - the prize goes to R12 (sort of) with an intake leak caused by not doing up the manifold bolts quite as much as necessary. I imagine the engine light was because of a discrepancy between the readings of the air flow sensor and lambda sensor.

    Cheers

    Rob
    Glad to hear you sorted it out !

  8. #8
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    Quote Originally Posted by LeRob View Post
    Thanks for the replies - the prize goes to R12 (sort of) with an intake leak caused by not doing up the manifold bolts quite as much as necessary. I imagine the engine light was because of a discrepancy between the readings of the air flow sensor and lambda sensor.

    Cheers

    Rob
    Just a question from a BX16v owner. Did you remove the intake manifold to change the alternator belt? If you did - Why?

    Cheers
    Michael

  9. #9
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    Michael,

    Changed the alternator itself, not the belt. I looked at removing it with the manifold in place but threw that in the too hard basket pretty quickly

    Rob

  10. #10
    Fellow Frogger! Mungous's Avatar
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    Erm, the alternator comes off really easily with the manifold in place! Remove adjuster mechanism, slacken off pivot bolt and withdraw as far as it goes, then position alternator so you can undo the 10mm nut, disconnect the field wire and you're done.

  11. #11
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    Quote Originally Posted by Mungous View Post
    Erm, the alternator comes off really easily with the manifold in place! Remove adjuster mechanism, slacken off pivot bolt and withdraw as far as it goes, then position alternator so you can undo the 10mm nut, disconnect the field wire and you're done.
    I second that. Never removed the inlet to remove the alternator. There is a cut-out in the alternator pivot and the bolt is "waisted" to let the cut-out fit.

  12. #12
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    yep and it is quicker and easier to take the manifold off and have access to everything for the sake of a few bolts and 2 nuts. Excellent time to change the oil(filter) as well. Everything is so open with the manifold sitting on top of the cam cover.
    Neil
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