|
||
|
15th April 2024, 16:58 | #1 |
Can't help myself
Rover 75 CDTi 2005 Join Date: Jan 2018
Location: Lincoln
Posts: 888
Thanks: 469
Thanked 150 Times in 113 Posts
|
4th gear jumping (auto box)
Just recently, I've been noticing a small jump or slip after manually shifting from Drive to 4 whilst decelerating. The box shifts down ok but after 3 seconds or so from when 4th gear engages and takes up the momentum on the overrun, it has a little slip and then continues to let the car overrun. It's consistent every time I do it. No other anomalies are apparent in any gear under any other circumstances.
Any ideas? Dougie. Last edited by goltho; 15th April 2024 at 17:00.. |
16th April 2024, 08:44 | #2 |
Gets stuck in
Rover 75 Tourer Join Date: Mar 2022
Location: Chesterfield
Posts: 728
Thanks: 206
Thanked 69 Times in 53 Posts
|
When was the transmission fluid last changed?
|
16th April 2024, 08:52 | #3 |
Can't help myself
Rover 75 CDTi 2005 Join Date: Jan 2018
Location: Lincoln
Posts: 888
Thanks: 469
Thanked 150 Times in 113 Posts
|
I don't know if it ever has been but I suspect never. In fact, I've planned for changing it once some good weather stabilises as I've done on all my previous 75s. The tranny's otherwise responsive, moreso than others I've had. Is this symptom a known issue with old fluid?
Dougie. |
18th April 2024, 18:10 | #4 |
Can't help myself
Rover 75 CDTi 2005 Join Date: Jan 2018
Location: Lincoln
Posts: 888
Thanks: 469
Thanked 150 Times in 113 Posts
|
I've still not unearthed any further info. Any clues anyone?
Dougie. |
18th April 2024, 19:13 | #5 |
Doesn't do things by halves
Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007
Location: Former Middlesex
Posts: 20,589
Thanks: 1,587
Thanked 3,749 Times in 3,181 Posts
|
Hi Dougie,
Most automatic transmission apparent faults are down to one of two things, or both of them:
What's the mileage of this engine Dougie? Simon
__________________
"Whatever is rightly done, however humble, is noble." Sir Henry Royce. |
18th April 2024, 19:40 | #6 |
Can't help myself
Rover 75 CDTi 2005 Join Date: Jan 2018
Location: Lincoln
Posts: 888
Thanks: 469
Thanked 150 Times in 113 Posts
|
|
19th April 2024, 14:39 | #7 |
Posted a thing or two
rover 75 club se Join Date: Apr 2011
Location: Leicester
Posts: 1,741
Thanks: 358
Thanked 419 Times in 310 Posts
|
See what happens in sport mode ... thats what your style of driving is for...
|
21st April 2024, 07:19 | #8 |
Doesn't do things by halves
Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007
Location: Former Middlesex
Posts: 20,589
Thanks: 1,587
Thanked 3,749 Times in 3,181 Posts
|
Thanks Dougie and apologies for not thinking to read your sig!
I wouldn't expect an internal automatic gearbox problem at that mileage but you could check the resistances of the valve solenoids. But before delving into that, ensure that your engine is running perfectly. The slightest irregularity here can result in the sort of symptoms you've described. For example, you might have read my thread a few months ago when my idle speed was high. At that time some of my gear changes were more of an abrupt snatch than a smooth transition. As soon as the idle was corrected, the gearbox returned to normal. Simon
__________________
"Whatever is rightly done, however humble, is noble." Sir Henry Royce. |
29th April 2024, 01:59 | #9 |
Can't help myself
Rover 75 CDTi 2005 Join Date: Jan 2018
Location: Lincoln
Posts: 888
Thanks: 469
Thanked 150 Times in 113 Posts
|
|
29th April 2024, 02:06 | #10 | |
Can't help myself
Rover 75 CDTi 2005 Join Date: Jan 2018
Location: Lincoln
Posts: 888
Thanks: 469
Thanked 150 Times in 113 Posts
|
Quote:
This last week, the momentary 4th-gear-on-overrun slippage issue disappeared so I'll keep a close eye/ear on it. I'd have to read up on how to check the solenoids' resistance. I've also diaried an ATF change in a couple of weeks. Dougie. |
|
|
|