147 Knocking - Alfa Romeo Forum
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(Post Link) post #1 of 8 Old 30-12-15 Thread Starter
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147 Knocking

I have a knocking sound coming from the kerb side front ever since I bought the car.
The MOT said the lower wishbone ball joint needed replacing, so after looking on here I decided to go for Meyle replacement parts. I have now replaced the following parts chasing this knocking sound.
Both Top wishbones.
Both Bottom wishbones.
Front and back Drop Links
New complete Anti roll bar and bushes.

I have noticed that the engine tray has only got 4 screws in place, so I am going to replace all of them ( I believe they are M6 x 25mm) just in case itís that flapping a round.

Only other thing I think it could be is the Strut?
Any ideas?

Thanks for any help.
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Strange, the knock is usually the anti roll bar bushes. Try removing the undertray and listening rather than tightening it.
Other ideas; exhaust, engine mounts, springs, shocks, plastic wheel arch liner, drive shafts, cv joints.
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All of what DG said, also strut top mounts have been known to go.

Also is it diesel or petrol?, lots of intercooler brackets are rusting away on older diesel cars, have seen one where the ic was flapping about at one side, worth a check.
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147 JTDM 16V

I have the same problem. Car just passed the MOT so shouldn't be any of the obvious things and I checked them myself before hand anyway and couldn't see anything wrong. New lower wishbones, no movement in top ones. Sounds a bit like the ARB but this was changed 20K miles ago and when checked recently there's no sideways movement at all, bushes seem tight. So the only other thing is the struts themselves. However there's nothing obviously loose/broken when you check them in situ. Guess the only real way to check properly is to remove them which looks like another job that should be simple but won't be because everything will be corroded solid.
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Thanks for the advice.
It is a diesel and i will check the intercooler brackets. But the car is not that old 2008.
The Alfa is very pampered as if I think anything is rusty or worn, I change it and only for the best.

I have a 2 year old Focus which I hate driving and will take the Alfa anytime over the Focus.
If I can not see anything loose I will change the dampers and springs all round.
I do not want to lower it as I'am happy with the ride height.
What make is the best for the car as I have used Koni in the past on Fords.

Thanks again for the advice.
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I've been caught out with wheel nuts not quite tight enough--- sadly ?

Also check driveshaft nut on Hub and even driveshaft Allen bolts.
Top mount cross bolt can wear and create knocking.
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Suggest you replace the undertray with the aluminium version, which gives you better clearance also. If replacing dampers I would go for fully adjustable coilovers - mine from AP Sports/KW were not expensive and work really well. Will lower the car just a bit, if set at it's highest - but no prob with the alu undertray.
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Ok, Thanks for all the suggestions.
The knocking is suspension related as checked all other items.
No knocking on small bumps but large bumps are very noticeable.
It seems to be worst on a run of close medium bumps and it seems to be on the rebound.

Ooo Aluminium engine tray. Will have a good look at that.
Been offered a Q2 sport engine and gearbox with diff.
Not sure how much work would be needed to swap over mine to that.
I have an JTDm 8V, been mapped and setup at 154bhp.

Thanks again.
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