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Automatic Gearbox - Revs Increased by Jürgen

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Jürgen
(Site Admin)
During the past few days I noticed a slightly different behavior of the automatic gearbox.

1. When I'm going at a steady speed of 30 mph (for example) and want to accelerate gently, the revs increase for a second or two, before falling to the former level again. Sometime it happens even when I intend to stay at 30 mph without using the cruise control. It's non-reproducible, but may happen once or twice during a journey of more than 15 miles.

2. I've noticed that sometimes the car seems to crawl slower when I release the brake without pushing the accelerator.

I've booked a full service for the days to come and the gearbox oil will be changed, although it's not due yet. It has been changed in 2006 and 2010.

I've read about the solenoids, could one of these be the culprit? Any ideas, please?

Or is it about time to :panic: now ... Well, not yet. ;)

Posted 17 Feb 2012, 17:12 #1 

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Mick
(Site Admin)
2. Has tickover RPM changed at all?

Posted 17 Feb 2012, 17:16 #2 

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Jürgen
(Site Admin)
No, all seems to be normal. Even the gear changes are as smooth as they have been in the past.

Posted 17 Feb 2012, 20:05 #3 


PaulT
or go for a gearbox overhaul if it still persists after the service
Paul

That apart Mrs Lincoln, did you enjoy the play

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Posted 17 Feb 2012, 23:34 #4 

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James.uk
Checking the voltages on the various solemoids wont cost much, and may reveal the problem. But hopefully it is just the oil needing replacing.. :) :)
...

Posted 19 Feb 2012, 17:24 #5 

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Jürgen
(Site Admin)
Mick, I think that you've been right on this topic. :thumbsup:
Last time it happened, the idle RPM have been a bit lower than usual. Maybe I've been a bit hypersensitive. :confused:

The oil has been replaced, so let's wait and see what to do next ...

Posted 19 Feb 2012, 21:51 #6 

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Mick
(Site Admin)
Hope the service has sorted it out.

Posted 20 Feb 2012, 12:11 #7 

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Bermudan 75
Has anyone heard from Jürgen?
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Posted 22 Feb 2012, 00:44 #8 

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Jürgen
(Site Admin)
Rover418275 wrote:Has anyone heard from Jürgen?

No, and I don't know whom to ask about the whereabouts ... ;)



The problems haven't returned yet, but I haven't driven much since the service either. As it has been intermittent, it's too early to consider it done.

Posted 22 Feb 2012, 11:59 #9 

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Jürgen
(Site Admin)
Finally it got worse and the car is off the road for some time now. :panic:

The diagnosis has been burned clutches of 3rd to 5th gear and worn out converter coatings. The overhaul at a transmission specialist will take one to two weeks. So it's a bit on the expensive side ... but it's worth it to keep the 75. :)

Posted 02 Apr 2012, 21:17 #10 

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Jürgen
(Site Admin)
Finally I got my 75 with its refurbished gearbox back. It's running as smooth as new (running in recommended ;)).

So I'm chuffed now. :)

Posted 09 Apr 2012, 18:07 #11 

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kandyman
That's great news, hope you saved some money to buy a few easter eggs ;)
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Posted 09 Apr 2012, 19:22 #12 

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Jürgen
(Site Admin)
Yes, Andy, I've been quoted a very reasonable price indeed. :)

Now all I've to do is to drive decently for about 600 to 900 miles and then get the oil changed.

Posted 09 Apr 2012, 22:08 #13 

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Jürgen
(Site Admin)
The car is behaving very well, so 750 miles later it's about time to get the oil changed tomorrow.

Posted 06 May 2012, 12:59 #14 

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Bermudan 75
How did you get on Jürgen?

Mike
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Posted 07 May 2012, 21:39 #15 

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Jürgen
(Site Admin)
Got the oil changed today, Mike. The car drives dream like again. All I have to do now is a bit of cleaning and a fill up, than I'll be ready to start.

Looking forward to see you on Saturday. :)

Posted 07 May 2012, 22:40 #16 

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