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Discussion Starter #1 (Edited)
I have just bought an Alfa 159 2.4 JTDM Q4 Sportswagon (2007) and it is exactly what i wanted. In the most part it is great however there are a few issues I am hoping someone will know the answer to.

When changing up from 2nd to 3rd or 3rd to 4th I sometimes get a clunk noise from the rear diff. I haven't had a chance to check the obvious - worn UJs - but I am not expecting them to be faulty. My understanding is the clunk is the take-up of the centre diff loading the rear diff. Incidently it doesn't happen if I take time to change gear or going down hill (ie not under load). Has anyone had issues with diffs/drive shafts/UJs etc?

I have noted the rear tyres (all four are the same Pirellis) are starting chamfer on the outer edge of the treads (i had this on a freelander many years ago too). Would swapping the rears to the fronts help? Even though the treads are still deep is there any merrit in replacing the rears or even all the tyres?

Any help would be great

David
 

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The clonking rear diff is a 'feature'. Everybody with a Q4 on here complains about it!

The 159 is sensitive to wheel alignment issues. A full Hunter wheel alignment is highly recommend :thumbs:
 

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I have just bought an Alfa 159 2.4 JTDM Q4 Sportswagon (2007) and it is exactly what i wanted. In the most part it is great however there are a few issues I am hoping someone will know the answer to.

When changing up from 2nd to 3rd or 3rd to 4th I sometimes get a clunk noise from the rear diff. I haven't had a chance to check the obvious - worn UJs - but I am not expecting them to be faulty. My understanding is the clunk is the take-up of the centre diff loading the rear diff. Incidently it doesn't happen if I take time to change gear or going down hill (ie not under load). Has anyone had issues with diffs/drive shafts/UJs etc?

I have noted the rear tyres (all four are the same Pirellis) are starting chamfer on the outer edge of the treads (i had this on a freelander many years ago too). Would swapping the rears to the fronts help? Even though the treads are still deep is there any merrit in replacing the rears or even all the tyres?

Any help would be great

David
Welcome to AO by the way! :) :)

I've found that even with the Q4, the front tyres wear slightly quicker than the rears. Ideally your tyre wear should be as even as possible, followed by the replacement of the full set (often a painful experience), so as to avoid unnecessary centre diff wind-up. Wearing on the outer edges of the rear treads is less common. The most common wear is on the inner edges of the fronts, as the factory setup for the 159 is with a relatively large amount of toe-in.

Maybe your tyres have already been rotated and are on backwards?? :cheese:
 

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Discussion Starter #8
Q4 clonk

Thanks for all the replies, bit new to this game so hopefully you all get this message.

I had my doubts that I would be on my on with this issue! I understood Q4s had a tendancy to do this. Looking at the torsen website I believe our Q4s have an almost identical setup up to Audi S series quattros raher than the "on demand" version of the main stream quattros. It will be interesting see if they experience the same issue - I will try and find out.
Ref the tyre wear (which seems to be a stepping chamfered affair) as I say my freelander did it. Under warranty LandRover had a dealer fix to stop it -again I will see what that was (freelander system was on demand).

I visited my local dealer (Bradleys, Scorrier) and they are doing an hours labour for me to check the following; transmission inc Q4 diffs, suspension, brakes, tyres, and steering etc. I rather they found something now so I can deal with it. They don't do a full laser job on the geometry but if they feel it necessary wit refer me to a specialist locally.

On this subject I believe I am lucky enough to have another 159 "feature" noisey PAS. There is now play and it works very well but is a little noisey when turning the wheel when stationary with a small amount of vibration. They told me they had replaced two racks already this week - gulp - lets hope my dealer insurance warranty pays up if needed.

Thanks
 

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+ another re the clunking. You don't really notice it after a while. I noticed this on my test drive and asked the seller (private) about it. He replied it had always done it and he'd had the car from new.

Regarding the four tyres being the same / similar amount of tread to stop "wind up," there was a post not long ago that said with this Torsen system that it is not a problem. IIRC there is something in the Alfa manual about this.

Redmatt75 said; The most common wear is on the inner edges of the fronts
+1. My rear tyres wear perfectly evenly, but the fronts even after tracking wear the inner edge.
 

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Discussion Starter #11
Thanks guys,

I am not new to Alfa ownership as my wife and I have had a 1.9 multijet 156 sportswagon for the last four years and it has been briliant. Only one issue with it the turbo went. Now i can't blame alfa for that as the turbo is german (garratt) and happens to be identical to the one fitted to my old Seat leon which also blew up! Blo*dy things. Otherwise it has been ultra reliable and returns a regular 48 to the gallon (60 mile round trip every day)
 

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Hi guys!
Yesterday I bought Crosswagon. I fall in love to this car on my way home (Oslo-Stavanger) but there is some issues. I noticed that after remove my feet from gas pedal there is a clonk under back seat. Exactly same sound what i heard in my 75 when gearbox suspension was gone.
This is the clonk described as feature or do I have something to worry about?
I don't have access to car lift now to check this, so have to ask Alfa community first.

regards
KK
 

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Hi guys!
Yesterday I bought Crosswagon. I fall in love to this car on my way home (Oslo-Stavanger) but there is some issues. I noticed that after remove my feet from gas pedal there is a clonk under back seat. Exactly same sound what i heard in my 75 when gearbox suspension was gone.
This is the clonk described as feature or do I have something to worry about?
I don't have access to car lift now to check this, so have to ask Alfa community first.

regards
KK
No, the clonk mentioned above is when you release the clutch and the drive-train loads up. I've never noticed it when coming on-off the gas and would suggest a worn bush is more likely in that case.

Ian A.
 

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During Christmas brake I had time and opportunity to fix my clonk. I found that rear diff suspension was in really bad shape. I paid a fortune for new ones (over 200 euro for small piece of aluminium with two rubber bushes). It was pretty easy to change it, but problem was only partially solved. Before, strong clonk like a hit in the floor on back of the car, was every time I pressed clutch or released gas pedal. After change, soft clonk is present when I'm to hard/fast with changing gears. When I gently release gas and then press clutch there is no clonk at all. But how to drive Alfa without hard acceleration?
Well, I can drive with clonk almost without hearing it but I don't like that my passengers can hear it...

Old part:


New part:


On the beach in Denmark (on way back home from Christmas)
 

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Thanks guys,

I am not new to Alfa ownership as my wife and I have had a 1.9 multijet 156 sportswagon for the last four years and it has been briliant. Only one issue with it the turbo went. Now i can't blame alfa for that as the turbo is german (garratt) and happens to be identical to the one fitted to my old Seat leon which also blew up! Blo*dy things. Otherwise it has been ultra reliable and returns a regular 48 to the gallon (60 mile round trip every day)
Sorry for interrupting whit off-topic: The turbo featured to the 156/GT/159/Braras was a Garret 1749vb or vvt, yes! Some say they're the best, still, SAAB (turbo specialists) re-designed it, fitting a specific turbine and fine-tunning the vanes opening-closing sensitivity!!! At least for 159's they did, since they were business buddies whit the GM group Everyone shared that knowledge

Irregular tyre wear on 159's is strong, the recomended action is to re-align all 4 geometries to zeros or -.06º value, anyway, specialist know that and are pretty much ready to correct that! It was the first thing i did after buying the car, and the technician said that i would love to understand what's the intention on that standard allignement ALFA sets for 159's.

Hadn´t heard anything about gearshifting noises on q4 transmissions!
Best of luck, it wont probably be nothing harsh!
 
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