Home > Technical (L322) > Possible Transmission Fault?? |
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RRPhil Member Since: 22 Aug 2011 Location: Blackburn, Lancashire Posts: 968 |
When the torque converter lock-up clutch on the 5HP24 gets worn it causes a vibration which sounds a bit like driving over a cattle grid. The rev counter needle moves around very slightly in sympathy with the noise. On my L322 I found it was worse at a steady 30mph driving up a gentle incline. Does this fit in with your symptoms, or not really?
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7th May 2019 5:36pm |
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Tom Heath Member Since: 19 Mar 2017 Location: Telford Posts: 103 |
Thanks Phil. It sort of does - it feels exactly like driving over a cattle grid, but there is very little noise associated with it - it’s more feel than sound! Does anyone have a contact for a reliable reconditioner?
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7th May 2019 6:04pm |
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RRPhil Member Since: 22 Aug 2011 Location: Blackburn, Lancashire Posts: 968 |
Hmmm. Still doesn’t sound 100% that it is the LUC causing the issue.
Do you have access to any diagnostic kit which can record the engine and input speeds, as this is the only sure-fire way of proving whether or not it’s the LUC causing the issue? Phil |
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7th May 2019 6:37pm |
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Tom Heath Member Since: 19 Mar 2017 Location: Telford Posts: 103 |
Thanks for this Phil. Much appreciated. If I can find it, I’ve got a BLuetooth IBD module which should pick it up from the ECUs .... however it’s not been seen in the garage for a while ... I need to find it!
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7th May 2019 9:13pm |
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wayneg Member Since: 05 Jun 2013 Location: South Fremantle, Australia ( ex London ) Posts: 798 |
I am no expert on auto boxes but have been told if you get a feeling like driving over a rough patch of road / cattlegrid it could be the lock up clutch in the torque converter slipping. Before shedding out $$$ try a fluid / filter change and add a dose of DrTranny... https://www.ashcroft-transmissions.co.uk/l...-fixx.html 2007 TDV8 VSE
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8th May 2019 6:37am |
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Tom Heath Member Since: 19 Mar 2017 Location: Telford Posts: 103 |
Thanks for the really helpful comments guys. Over the last week, I’ve been more focussed on listening when and how the rumble happens. I’ve noticed there is a load hum when the judder happens. I’ve dropped it into the local Independent RR place this morning . They are checking it over to make sure there is nothing obvious, but planning to do a tranny fluid power flush today. Hopefully this will give a good indication if it’s the torque converter, even if it’s only a semi temporary fix!
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11th May 2019 10:49am |
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Tom Heath Member Since: 19 Mar 2017 Location: Telford Posts: 103 |
Fingers crossed .... no juddering on the test drive by the garage or me afterwards! A full powerflush with new fluids and additives. Hopefully a £300 cheaper fix! 2005 L322 Tonga Green 4.4l BMW Engine with Touchscreen
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11th May 2019 12:50pm |
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