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Lurch and lumpy gear change on 3.2 xj40

Morgan1
Posts: 165
Joined: Thu Dec 08, 2016 10:45 pm
Location: Aberdare, south Wales

Re: Lurch and lumpy gear change on 3.2 xj40

Postby Morgan1 » Sat Jun 15, 2019 5:58 pm

Definitely can cause issues. I've been out with the spanners today adjusting both the accelerator cable and the gear change cable. The gear changes are vastly improved. The lurch from drive to reverse is still there. So I'm going to see if I can reduce the idle revs as they are about 750rpm, this may put less pressure when I engage the drive or reverse?

Anyone live near me in South Wales (uk) who has a 3.2litre car that i could look at to compare?
1992 Jaguar xj6 3.2 litre.
2016 Audi A6 S line.
2016 Ford Fiesta zetec.

leo_denmark
Posts: 766
Joined: Sun Sep 11, 2011 6:32 pm
Location: Denmark

Re: Lurch and lumpy gear change on 3.2 xj40

Postby leo_denmark » Sat Jun 15, 2019 6:56 pm

How about the rear outer fulcrum bearings ? Mine were badly shot, resulting in slack and noise. The bore for the LH fulcrum bearings in the hub is actually too loose, so I still get a small noise when changing from reverse to forward, but at least my toe-in/toe-out is now staying within reasonable limits...
BR Leo Jensen - Denmark
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XJ40 3.2 LHD 1992 (VIN: ...660341). Owned since Nov 9th 2005
XJ-S V12 coupe 1977 (SW53309BW). Owned since April 28th 2016. http://www.xj-s.dk/home/
Citroën 2CV 1975. Owned since Sep 1st 1984
Board member of Jaguar Club of Denmark

Morgan1
Posts: 165
Joined: Thu Dec 08, 2016 10:45 pm
Location: Aberdare, south Wales

Re: Lurch and lumpy gear change on 3.2 xj40

Postby Morgan1 » Sun Jun 16, 2019 4:21 pm

Thanks Leo for the suggestion. I checked the shaft and bearings when I rebuilt the diff etc. They were nice and tight so I don't think it is them? But I'm slowly running out of idea's :lol: checked the history and the clutch etc hasn't been changed so could be that? As it has done 131000 miles and not sure of the type of environment it was driven.
1992 Jaguar xj6 3.2 litre.
2016 Audi A6 S line.
2016 Ford Fiesta zetec.

abercanadian
Posts: 1354
Joined: Tue Oct 16, 2012 6:50 am
Location: Vancouver Island

Re: Lurch and lumpy gear change on 3.2 xj40

Postby abercanadian » Mon Jul 15, 2019 5:51 pm

Just a quick FYI

Reading a post on another forum, it seems as though the choice of transmission fluid can greatly affect smoothness of gear shifts. Try to find the closest viscosity to specified fluid and avoid synthetics was the advice I read. Just sayin'

Larry
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94 XJ40 VDP vin 701729
Oyster Metallic/Doeskin on Aero Alloys
230,000 Kilometers 143,000 Miles
Daily Driver

94 XJ40 SOVEREIGN vin 703632
Diamond Blue Metallic/Barley
111,000 Kilometers/69,000 Miles
Parts Car

Morgan1
Posts: 165
Joined: Thu Dec 08, 2016 10:45 pm
Location: Aberdare, south Wales

Re: Lurch and lumpy gear change on 3.2 xj40

Postby Morgan1 » Mon Jul 15, 2019 8:25 pm

Cheers Larry for the info re the article. I tried selling the car this week as I thought I might go for something older before pending more on her. 1200 plus views and over 100 watchers but no bids over the £1800 starting price.....So I've decided to keep her lol. I will definitely try more fluid changes. It has improved a lot since the tick over adjustment and playing with the gear change adjustment but still not up to my expectations. As I investigate further I'll post the updates. Cheers
1992 Jaguar xj6 3.2 litre.
2016 Audi A6 S line.
2016 Ford Fiesta zetec.

abercanadian
Posts: 1354
Joined: Tue Oct 16, 2012 6:50 am
Location: Vancouver Island

Re: Lurch and lumpy gear change on 3.2 xj40

Postby abercanadian » Tue Jul 16, 2019 5:23 pm

Hi Craig - seems a shame to get rid of the old crate after putting in SO much work! gasp! :o

Anyway, further to the fluid question, Dexron/Mercon transmission fluid of the type our cars need is no longer available, so folks use a substitute. One important spec to pay attention to when shopping for new fluid is the viscosity at a given temperature.

The stuff I use is for old cars like mine and called Motomaster ATF(DEXRON type), a brand from a Canadian big-box store so not available in the UK - however the specs on this stuff are better than the old Dexron/Mercon.

from the discussion on another site:

The viscosity of MotoMaster ATF is specified at 40 mm2/s at 40 degrees Centigrade, which is actually higher than original ACDelco Dexron III


DonB says:
Correct fluid is critical of course, but other issues could be at play. Smooth gear shifts are orchestrated between the ECM and TCM based on several sensor inputs, among them engine load (MAF sensor), engine speed (CPS), road speed (ABS Control Module), and throttle position (TPS). If any of the important signals are a little out of range, shifts can be affected. You might try cleaning the electrical connector at the transmission, drilling drain holes in your TPS housing and flushing it, cleaning the electrical connectors for all important EMS sensors, and cleaning the ground points referenced by the ECM (two at the intake manifold runners and the one on the firewall behind the cylinder head), the ones referenced by the TCM (there are three, at least one is on the firewall behind a blower motor), and the engine ground strap.


HTH

Larry
Image
94 XJ40 VDP vin 701729
Oyster Metallic/Doeskin on Aero Alloys
230,000 Kilometers 143,000 Miles
Daily Driver

94 XJ40 SOVEREIGN vin 703632
Diamond Blue Metallic/Barley
111,000 Kilometers/69,000 Miles
Parts Car

naki_k
Super Moderator
Posts: 28679
Joined: Sun Feb 21, 2010 9:25 pm
Location: Kirton, nr Boston, Lincolnshire

Re: Lurch and lumpy gear change on 3.2 xj40

Postby naki_k » Tue Jul 16, 2019 11:56 pm

What a shame you have not got the result you wanted after all that work.
I wonder if you can try to rotate the prop shafts/ drive shafts by have to try and see if either of those out puts have a lot of slack in them? It won’t be good news either way though an afraid. As if there is excess slack in them, there’s no real way to fix, other than replace/ rebuild the box/ diff. But it might set you mind at test to find out?
It’s good thinking to find another 3.2 to try to compare to.
88 3.6 XJ6 PDH/CEM
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91 4.0 XJ6 Manual
92 4.0 XJR Manual
92 4.0 XJR
93 3.2s - 4.0 Manual conv
93 4.0 Sovereign
93 6.0 XJ81 DD6 x2
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Breaking 40/ 300

Morgan1
Posts: 165
Joined: Thu Dec 08, 2016 10:45 pm
Location: Aberdare, south Wales

Re: Lurch and lumpy gear change on 3.2 xj40

Postby Morgan1 » Wed Jul 17, 2019 12:48 pm

Definitely need to compare mine with another 3.2. I'll look for one in the shows and see if they will let me go underneath :lol: :oops: on a slightly different note I cleaned the intake side to see if there were issues there with idle before I adjusted her down. Amazing how clean it was when I took it off.
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1992 Jaguar xj6 3.2 litre.
2016 Audi A6 S line.
2016 Ford Fiesta zetec.

Morgan1
Posts: 165
Joined: Thu Dec 08, 2016 10:45 pm
Location: Aberdare, south Wales

Re: Lurch and lumpy gear change on 3.2 xj40

Postby Morgan1 » Wed Jul 17, 2019 12:49 pm

And after cleaning.....
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1992 Jaguar xj6 3.2 litre.
2016 Audi A6 S line.
2016 Ford Fiesta zetec.

naki_k
Super Moderator
Posts: 28679
Joined: Sun Feb 21, 2010 9:25 pm
Location: Kirton, nr Boston, Lincolnshire

Re: Lurch and lumpy gear change on 3.2 xj40

Postby naki_k » Wed Jul 17, 2019 2:13 pm

That should make a good difference to the idle smoothness, if nothing else.
Why not come along to the main meet on the 3rd August? It’s only a few weeks away now.
88 3.6 XJ6 PDH/CEM
90 Range Rover Vogue SE 3.9 V8 LPG
91 4.0 XJ6 Manual
92 4.0 XJR Manual
92 4.0 XJR
93 3.2s - 4.0 Manual conv
93 4.0 Sovereign
93 6.0 XJ81 DD6 x2
93 6.0 XJ81 XJ12
94 4.0 XJR
94 4.0 Daimler
96 4.0 X306 XJR
96 4.0 X300 D6
97 4.0 X300 Sport Manual
2000 LR Discovery ES TD5 A
Breaking 40/ 300