RichardLlanfyllin
Member Since: 30 May 2019
Location: LLANFYLLIN
Posts: 17
  
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As have I, but all on the old manual boxes. As soon as we matched the tyres, the problem went away.
The telling thing was that if I steered slightly right, the autobox behaved and that would have been to compensate for the extra distance travelled by the new tyre over the old.
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 30th May 2019 3:20 pm |
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Narpy
Member Since: 18 Jul 2011
Location: Stockport
Posts: 7830
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If you scrubbed a tyre to the cloth, I'd suggest a 4 wheel alignment is in order.  Mods:
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| 30th May 2019 4:10 pm |
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Bazza.
Member Since: 06 Jul 2018
Location: Essex
Posts: 332
 
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RichardLlanfyllin wrote:I've just had an issue after a tyre change so thought I would share it with you.
I had one tyre on the front which had worn to the canvas on the inside (but about 4mm left on the rest) and 4mm on the other tyre. I changed JUST the tyre down to the canvas.
When I started driving, I first noticed that the gear changes didn't seem in time to what they used to be. Then when I kicked-down to over take, even after easing off, the gears wouldn't change up. I tried this several times, and the conclusion was that that kickdown had stopped working and I wondered if they'd damaged something jacking the car.
I took it out on another run and notice that I could get it to change up after kickdown if I steered right (to the side of the new tyre).
Long and short, the tread depth difference is important. I took it back and the guy who tracks the cars is pretty hot on 4x4's and knows the issue. He reckons the "tolerance" is as little as 2mm on the same axle and beyond that you can start getting traction control cutting in and all sorts or issues. I did say that this is my 7th disco and never had to change both tyres on the same axle. He said "I bet it's your first auto"
The tyre being worn irregularly in the first place is the biggest clue. Something is causing it to drag. Get your 4 wheel alignment/tracking checked then look for worn bushes in the suspension arms front AND back. The auto box will be reluctant to change up if it's taking extra power to maintain speed as it thinks there's a hill to climb.
Does the car wander when it goes over ruts in the road?
is the steering true or do you have to hold some lock on to remain straight?
What's you mpg like? Disco 4 2012
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| 10th Jun 2019 11:01 am |
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