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Home > Technical > Fault finding help: rear diff or haldex |
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Lakelander Member Since: 07 Nov 2019 Location: Cumbria Posts: 244 |
Pesky auto correct!
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9th Jul 2024 9:11 am |
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Chrism551 Member Since: 01 Feb 2021 Location: Blackpool Posts: 149 |
Sure its not front ptu splines stripped. I would expect some message on dash if haldex had failed. |
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9th Jul 2024 11:56 am |
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Arese Member Since: 09 Jan 2012 Location: Casablanca Posts: 397 |
If the mechanical part of the Haldex is faulty there's no message on dash. |
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9th Jul 2024 1:51 pm |
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Nebulaman Member Since: 21 Jun 2023 Location: Lowestoft Posts: 35 |
I did read that pulling the FB1 fuse is a test but completely forgot. Thanks for reminding me and I’ll try it at the weekend. I swear when I pulled out of a track yesterday the rear wheel that were still in the muck span. No sure but would this be an indicator of wear so it grabs only occasionally? I’ll get under at some point and see if there is any play in the drive train shafts. I tried the rear diff to wheel shafts and they seems solid. I think I also need to get the car in the air. Will report back! |
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10th Jul 2024 8:46 am |
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Nebulaman Member Since: 21 Jun 2023 Location: Lowestoft Posts: 35 |
There is an occasional knock from the front to haldex area but I’ve also got a loose heat shield. I’ll get a properly look later as this might be something. Thanks |
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10th Jul 2024 8:48 am |
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Bobupndown Member Since: 26 Dec 2014 Location: Upside down behind the TV! Posts: 2806 |
Normally when there is s haldex fault you'll get a warning "Gearbox fault traction reduced" or similar and although it says gearbox it isn't! and terrain response won't be available. I've had this with pump screen filter blocked.
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10th Jul 2024 3:40 pm |
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Nebulaman Member Since: 21 Jun 2023 Location: Lowestoft Posts: 35 |
Part of my plan over the next couple of months was to do a full service, cambelt change, intercooler pipe replacement, turbo oil feed pipe leak fix and the pcv to air intake pipe leak fix. Just a shame that I hadn’t got this all done so at least I can rule out the need for a service!
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11th Jul 2024 10:56 am |
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Nebulaman Member Since: 21 Jun 2023 Location: Lowestoft Posts: 35 |
After writing the above post I thought “sod it! No point in procrastination” so did a few tests.
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11th Jul 2024 11:32 am |
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Aveling Member Since: 24 Mar 2011 Location: Cardiff Posts: 266 |
The rear shafts will always move - they're connected to the wheels.
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11th Jul 2024 12:10 pm |
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Nebulaman Member Since: 21 Jun 2023 Location: Lowestoft Posts: 35 |
I only checked to rule out seizing. The initial bang and the subsequent intermittent low speed cornering knocking comes from the very rear. I sat my son in the bare boot and drove up and down the drive. He said the noise was below the boot. I’ll look later if there is any play or weeps from the front PTU.
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11th Jul 2024 12:58 pm |
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Wonderdust Member Since: 23 Mar 2020 Location: Bucks Posts: 165 |
Mine turned out to be the PTU with those symptoms, only correctly diagnosed when I took it to Bell Engineering to have a new haldex fitted. |
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11th Jul 2024 5:55 pm |
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Nebulaman Member Since: 21 Jun 2023 Location: Lowestoft Posts: 35 |
It’s looking like it might be worth doing the 215 mile, 4hr+ drive to Bell Engineering. They seem to come highly recommended on here. Hopefully I will have the funds in a couple of months (if the diffs don’t implode in the mean time).
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11th Jul 2024 11:29 pm |
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Wonderdust Member Since: 23 Mar 2020 Location: Bucks Posts: 165 |
I'm back there on the 24th, booked in May so quite a waiting list for a new diff, a 120 mile trip for me but think it's worth it for the piece of mind that the job will be done correctly and ar a fair price.
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12th Jul 2024 3:24 am |
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BossBob Member Since: 30 Sep 2010 Location: Bristol Posts: 1389 |
Any one who owns one! Your 11 year old car was expensive and complicated to maintain 11 years ago when new. Just because you bought it second hand hasn’t reduced the complications and now things are wearing out they are going to be expensive to replace. |
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12th Jul 2024 6:34 am |
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