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Thread: Strange noise

  1. 20th November 2015, 09:08 PM #1
    mikel
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    Strange noise

    Our 2012 MY 2.7 D4 has developed a strange noise coming from the engine bay.
    Basically the noise appears from 1500 to 2300 odd rpms under normal driving in drive. The noise is similar to a fan belt / power steering pump type whine and can be heard from both inside and outside the cabin. It can be heard 20 m away when taking off up a slight hill. We have had the noise checked out by the dealer and when the mechanic heard the noise from inside the vehicle after 50m of driving, he mentioned "that's a new one on me".
    The noise started out as "occasional" but lately developed into almost constant while being driven within the rev range above. The noise goes away above 2300 rpms but will reappear when accelerating after the revs are lowered again. No noise is heard while the vehicle is revved while stationary.
    I have dropped it back to the dealer for the last 3 days and they apparently have been unable to hear it again having been driven for upto 30 mins each day. The noise was definitely there when I dropped it off after driving 30 mins to the dealership on Tuesday.
    I'm back in Sydney tomorrow arvo and will pick it up again.
    I'm concerned that it may be transmission related or be the start of something serious.
    Any ideas what the noise may be or way to isolate it? The dealer was going to use their "chassis ears" to try and find the problem but as the noise was no longer there they have not tried these.
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  2. 21st November 2015, 08:54 PM #2
    mikel
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    Strange Noise

    Picked up the D4 from the dealer this arvo and yep the noise is still there.
    I will run it for a day or two then take it back and see what they say.
    Mike L
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  3. 21st November 2015, 09:04 PM #3
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    justinc
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    Hi mate maybe fly me up one weekend and I'll do some diagnostics for you while we tour around some wine bars and latte shops?. Can i eat croissants in the car ???

    ☺ jc
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  4. 21st November 2015, 09:07 PM #4
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    And by the way my guess is it is engine/ turbocharger not trans related most likely a boost leak somewhere. The giveaway is no noise until load is applied and that rev range is right on the money...

    Jc
    The Isuzu 110. Solid and as dependable as a rock, coming soon with auto box😊
    The Range Rover L322 4.4.TTDV8 ....probably won't bother with the remap..😈
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  5. 21st November 2015, 09:18 PM #5
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    LandyAndy
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    The nannocom man posted recently about a cracked inlet manifold,they are plastic apparently.
    Worth looking up,even if you have to try a UK website,havent heard of it on here.
    Andrew
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  6. 21st November 2015, 09:46 PM #6
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    justinc
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    Quote Originally Posted by LandyAndy View Post
    The nannocom man posted recently about a cracked inlet manifold,they are plastic apparently.
    Worth looking up,even if you have to try a UK website,havent heard of it on here.
    Andrew
    Sounds like a good place to start andy!☺☺☺ i read that post forgot all about it!!

    Jc
    The Isuzu 110. Solid and as dependable as a rock, coming soon with auto box😊
    The Range Rover L322 4.4.TTDV8 ....probably won't bother with the remap..😈
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  7. 22nd November 2015, 12:19 AM #7
    BobD
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    Mine also had the cracked plastic manifold as per my posts and also in the BBS post. This causes limp home mode under hard acceleration which can be cleared initially but once it gets worse there is a loud hissing sound when the turbo is on boost and it will keep faulting during normal driving.
    Bob

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  8. 22nd November 2015, 07:38 AM #8
    mikel
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    Strange Noise

    Thank guys for the prompt replies and advice.
    I will broach this with the Dealer this week.
    NO jc you can't eat croissants in the car :-(
    Cheers
    Mike L
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  9. 22nd November 2015, 07:52 AM #9
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    justinc
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    Quote Originally Posted by mikel View Post
    Thank guys for the prompt replies and advice.
    I will broach this with the Dealer this week.
    NO jc you can't eat croissants in the car :-(
    Cheers
    Mike L
    😣😣😣 oh well worth a try. Hope they get to the bottom of it ☺

    Jc ☺
    The Isuzu 110. Solid and as dependable as a rock, coming soon with auto box😊
    The Range Rover L322 4.4.TTDV8 ....probably won't bother with the remap..😈
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  10. 22nd November 2015, 09:06 AM #10
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    I thought the cracked manifold had only been seen in 3.0L engines. Is that right?
    Cheers,

    Sean

    “Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.” - Albert Einstein
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