C4 knocking

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Andrew1979
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C4 knocking

Post by Andrew1979 »

Hi guys I have a 2007 Citroen c4 coupe vtr+ 1.6 hdi I have a knocking noise coming from the front I have had 4 mechanics look at it and they are not sure they dont think it is the suspension it only knocks when u go over a bump and it sounds like it is coming from under the bonnet like as if something plastic is knocking as a suspension knocking would be a deeper sound (if anyone understands what I mean by that) has someone had the same problem thanks in advance
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Re: C4 knocking

Post by GiveMeABreak »

If you've had all the bushes checked in the front, then it might be worth checking the engine mountings.....
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Marc
Andrew1979
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Joined: 29 Jul 2019, 15:00
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My Cars: Citroen c4
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Re: C4 knocking

Post by Andrew1979 »

Ok thanks for reply the 1 engine mount on the side the knocking is looks as if it has a bit of wear but on the passenger side the there is a new drop link but the 1 on the drivers side where the knocking is looks as though it hasn't been changed was wondering if that would cause it
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GiveMeABreak
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Posts: 36990
Joined: 15 Sep 2015, 19:38
Location: West Wales
My Cars: C3 Aircross SUV HDi Flair Peperoncino Red (The Chili Hornet)
C5 X7 2.0 HDi Exclusive Mativoire Beige (The Golden Hornet)
C3 1.6 HDi Exclusive Aluminium Grey (The Silver Hornet)
C5 MK II 2.0 HDi Exclusive Obsidian Black
C5 MK I 2.0 HDi SX Wicked Red
Xantia S2 2.0 HDi SX Hermes Red
C15 Romahome White
XM 2.0 Turbo Prestige Emerald Green Pearlescent
XM 2.0 Turbo Prestige Polar White
XM 2.0 SX Polar White
CX 20 Polar White
GS 1220 Geranium Red
CX 2.4 Prestige C-Matic Nevada Beige
GS 1000 Cedreat Yellow
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Re: C4 knocking

Post by GiveMeABreak »

That's why it's important to check all the rubber bushes in the hubs and joints as the it may not always be possible to test them by pulling or pushing them, but when the car is moving the weight and intertia is enough to cause a knock if any are worn.
C4 Drop links.PNG
C4 Pivut and Hub.PNG
Drop LinksFront Pivot & Hub
The above are to give you an idea.
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Andrew1979
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Re: C4 knocking

Post by Andrew1979 »

Ok great thanks I will get that checked out thanks guys
Andrew1979
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Re: C4 knocking

Post by Andrew1979 »

Just to let everyone know the knocking has been sorted it was the driver side shock and top mount
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