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Topic: Autobox Slight Problem (Read 2153 times) |
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PJDavis
Senior Member
2 x 1995 Jag X300 3.2 / 4.0 (Henley) 1957 XK140
 
Posts: 1474
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Autobox Slight Problem
« on: Sep 8th, 2011, 11:36am » |
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Ever since getting the car 3 years ago now, I had very slight mis-givings about the Autobox, it's never been just 100%, about 95% would sum it up. It may be due to the fact that the car before I had it had a slight leak and the previous owner had been just topping it up with the cheapest fluid until it got new pipes, and then the 'back-street' garage that replaced the pipes put the wrong fluid in it as well!
There has always been a very slight 'flare' when going from 2nd up to 3rd, at all speeds, but seems less of a problem when in 'kickdown'. Don't get me wrong, the car changes up well enough at all speeds, and it changes on the red-line in kickdown, and at 5000rpm when just resting my boot on the floor. I've never seen the O/D light come on whilst driving except when I have the wee button activated, and it's never flickered. I've changed the gearbox fluid and filter twice, (getting about 4-5 litres out each time) and am about to again. The fluid has no bits in it or sludge, but because it may still have some of the wrong fluid in it, it's a bit darker red. The car does drive well, no clunking or anything like that, or 'wash-board' feeling.
Just lately aye the last couple of days, the 'flare seems to be slightly more pronounced at all revs. Also just once, after driving the car quite hard I could have sworn the Revs dropped right down whilst I was doing about 95 mph, and then a split-second later it felt like it went back into gear! What happened was, I went into kick-down at about 55 mph to pass some traffic, it changed up at the usual from 2nd to 3rd around about 80 ish mph and I kept my foot on kick-down until I got passed the traffic I'd be doing close to the Ton, I then eased my foot off the pedal, (not completely) and of course the car then chose top-gear, but in that instant I'm sure that it was almost as if the car dropped-out of gear and then a micro second later I felt a wee thump just the same as if when you're doing 40 mph say and then activate the O/D button. Just as if it had again found a gear. No light flickered, and I eased my foot down again on the pedal and there was drive with no slipping, just a wee something, anyone have any ideas? If it's serious stuff then I'm not sure if I could or would be able to change the autobox in my driveway, maybe 20 years ago!
Please cheer me up!!
Peter
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I love 'Movvy'
1995 Jaguar XJ6 X300 3.2 (Henley)
1995 Jaguar XJ6 X330 4.0 (Dopey)
1957 Jaguar XK140 USA (converted to RHD, and to have fitted Mk10 420G Engine with BW 65 Auto Trans)
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scorpio_man
Administrator
Ford Kuga awd
Posts: 5654
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Re: Autobox Slight Problem
« Reply #1 on: Sep 8th, 2011, 2:11pm » |
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hi there
before condemning the the 'box, check out the coil packs and wiring. also the battery connections and engine earths.
hth
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PJDavis
Senior Member
2 x 1995 Jag X300 3.2 / 4.0 (Henley) 1957 XK140
Posts: 1474
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Re: Autobox Slight Problem
« Reply #2 on: Sep 8th, 2011, 2:51pm » |
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I've re-done the wiring fairly recently, and checked the coil-packs. I'll take a look at the earth-strap, and probably just replace it, but I thought other things would go wrong if the earth-strap was goosed.
Thanks for the reply Scorpio man.
Peter
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IP Logged |
I love 'Movvy'
1995 Jaguar XJ6 X300 3.2 (Henley)
1995 Jaguar XJ6 X330 4.0 (Dopey)
1957 Jaguar XK140 USA (converted to RHD, and to have fitted Mk10 420G Engine with BW 65 Auto Trans)
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scorpio_man
Administrator
Ford Kuga awd
Posts: 5654
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Re: Autobox Slight Problem
« Reply #3 on: Sep 8th, 2011, 2:56pm » |
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hi there
i'm just thinking with you saying you though the revs had dropped right down, then if it had 'jumped' out of gear, the revs would have risen, hence my thinking it's a engine fault as such.
hth
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Tompion
Administrator
1997 2.3 Ultima estate.
Posts: 2918
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Re: Autobox Slight Problem
« Reply #4 on: Sep 8th, 2011, 9:18pm » |
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Give the MAF a clean – even if you’ve done it recently.
Mine improved no end when I changed the Fuel Cut-off Loom, however if your loom is OK it might be worth cleaning the 2 big block connectors on the wing near the inlet manifold (it is possible cleaning them at the same time improved the gear changes on mine rather than the loom change).
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ABS multiplug wheel sensor pins MK IV or MK 20
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Dave2302
Senior Member
2006 Mercedes S55 AMG, Retired Barefoot Waterskier
Posts: 1119
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Re: Autobox Slight Problem
« Reply #5 on: Sep 9th, 2011, 8:34am » |
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Hi PJ,
I doubt the fluid will cause that problem, especially as you've changed it twice already 
TBH it is probably the Direct clutch / centre support rings, inside the gearbox. They do start off with a slight flare which gradually gets worse.
Does it have a delay going into reverse, worse when stone cold / proper hot ??
3rd and reverse share the direct clutch in operation 
It's not the end of the world, I know an auto gearbox specialist not a million miles from you, in Inverinate
He's got a 2 post lift in his workshop and transmission jack, so swapping it could be done in a few hours while you wait............
Best bet is to let me have a spare unit to give it a once over first, then there will be no hassle once it's fitted LOL
Regards Dave
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Dave "The 'ol Bear" ex Footer !
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PJDavis
Senior Member
2 x 1995 Jag X300 3.2 / 4.0 (Henley) 1957 XK140
Posts: 1474
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Re: Autobox Slight Problem
« Reply #6 on: Sep 9th, 2011, 12:25pm » |
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Good replies from all. Thanks a lot. As I said, I have suspected the Autobox for a long time, especially after contacting the previous owner and getting the info about him topping it up and the 'Back-Street' garage repair.
The first thing I did the other day was clean the MAF sensor. No real delay going into reverse, the only time it happened once was when the weather was down to Minus 17C for a couple of nights, I counted how long and it took about 2 seconds to engage.
Aye Dave, I must confess, I had that thought in my mind, I'll get an Autobox from someone on here, and I'll bring it over to you for the once-over. Then arrange a time convenient to slot the thing in. I need to visit you soon anyway, I've got to collect and pay for a Discs and Pads kit, and have you got my rear-centre-light yet? I'm hoping things gearbox wise will last until after the winter.
Cheers to all
Peter
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IP Logged |
I love 'Movvy'
1995 Jaguar XJ6 X300 3.2 (Henley)
1995 Jaguar XJ6 X330 4.0 (Dopey)
1957 Jaguar XK140 USA (converted to RHD, and to have fitted Mk10 420G Engine with BW 65 Auto Trans)
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Mike H
Senior Member
Renault Clio
Posts: 2594
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Re: Autobox Slight Problem
« Reply #7 on: Sep 9th, 2011, 7:29pm » |
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FWIW owners handbook says shouldn't take longer than 4 seconds, so 2 seconds while at –17C sounds quite reasonable
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Mike H
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Dave2302
Senior Member
2006 Mercedes S55 AMG, Retired Barefoot Waterskier
Posts: 1119
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Re: Autobox Slight Problem
« Reply #8 on: Sep 10th, 2011, 4:44pm » |
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Hi Peter,
Yes, Mike's right, 2 seconds is good, so it may only be a valve block job, but tbh, rather than faffing around, it would be best to run a seal kit thru a good S/H one and fit that
Rear Centre light ?? If i said I have it I will do, but we can soon find it, will probably be in workshop loft, which is a bit tidier these days LOL
I will be picking some parts up for you from Lee in a couple of weeks, so some time after that will be good for me.
If Stewart has a good Gearbox for you, I'll be picking some bits up from him soon, I have to arrange a visit to him, so I could pick that up too
Regards Dave
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Dave "The 'ol Bear" ex Footer !
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Mike H
Senior Member
Renault Clio
Posts: 2594
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Re: Autobox Slight Problem
« Reply #9 on: Sep 11th, 2011, 11:34am » |
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on Sep 8th, 2011, 11:36am, PJDavis wrote:it changed up at the usual from 2nd to 3rd around about 80 ish mph and I kept my foot on kick-down until I got passed the traffic I'd be doing close to the Ton, I then eased my foot off the pedal, (not completely) and of course the car then chose top-gear, but in that instant I'm sure that it was almost as if the car dropped-out of gear and then a micro second later I felt a wee thump just the same as if when you're doing 40 mph say and then activate the O/D button. Just as if it had again found a gear. No light flickered, and I eased my foot down again on the pedal and there was drive with no slipping, just a wee something, anyone have any ideas?
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As you were "booting it a bit 'ard" sounds like it was testing between 3rd & 4th to find out which ratio might be best. 4th was too high straight off so back to 3rd, then OK a couple of secs later will do it so back into 4th.
Again handbook sez if it keeps "hunting" like that between 3rd & 4th, e.g. on steep hills, best to turn O/D off to stop it hunting up & down. So to me that behaviour seems quite normal. (?)
FWIW for our local routes near home which are invariably < 50 mph I usually turn O/D off as it's usually a complete waste of time trying to use it, only turn it back on if going onto a dual carriageway for any reasonable distance, plus >= 50 mph (we got lots of 40 - 50 mph speed limits & cameras even on the dual carriageways)
HTH
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Mike H
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Mike H
Senior Member
Renault Clio
Posts: 2594
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Re: Autobox Slight Problem
« Reply #10 on: Sep 11th, 2011, 11:45am » |
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Appendix ~ plus, & sure I mentioned elsewhere, if cruising in 4th e.g. motorway, then have to release the gas pedal: A. you do get engine braking; B. when back onto the gas 4th has unlocked so it's back onto the torque converter (revs rise) then a second or so later it locks up again (revs drop). Pretty certain is normal behaviour too.
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Mike H
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Dave2302
Senior Member
2006 Mercedes S55 AMG, Retired Barefoot Waterskier
Posts: 1119
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Re: Autobox Slight Problem
« Reply #11 on: Sep 11th, 2011, 1:41pm » |
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Yes that is normal
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Dave "The 'ol Bear" ex Footer !
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PJDavis
Senior Member
2 x 1995 Jag X300 3.2 / 4.0 (Henley) 1957 XK140
Posts: 1474
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Re: Autobox Slight Problem
« Reply #12 on: Sep 11th, 2011, 4:31pm » |
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Aye. Dave, the rear centre light I'm referring to is something I've bought from Lee, and hoping that you'll take back to yours until I get over to you. I'll need to prod Stuart for a good-ish gearbox at some stage. I'll not be doing much to the Autobox until it really starts to annoy me or it breaks.
Thanks for all the replies, Peter.
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IP Logged |
I love 'Movvy'
1995 Jaguar XJ6 X300 3.2 (Henley)
1995 Jaguar XJ6 X330 4.0 (Dopey)
1957 Jaguar XK140 USA (converted to RHD, and to have fitted Mk10 420G Engine with BW 65 Auto Trans)
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Mike H
Senior Member
Renault Clio
Posts: 2594
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Re: Autobox Slight Problem
« Reply #13 on: Sep 11th, 2011, 9:48pm » |
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I'd be interested what differences there are old vs 'new'
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Mike H
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Dave2302
Senior Member
2006 Mercedes S55 AMG, Retired Barefoot Waterskier
Posts: 1119
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Re: Autobox Slight Problem
« Reply #14 on: Sep 11th, 2011, 11:46pm » |
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on Sep 11th, 2011, 4:31pm, PJDavis wrote:| Aye. Dave, the rear centre light I'm referring to is something I've bought from Lee, and hoping that you'll take back to yours until I get over to you. |
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Ah right, no problem at all, will pick that up
Cheers Dave
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Dave "The 'ol Bear" ex Footer !
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Mike H
Senior Member
Renault Clio
Posts: 2594
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Re: Autobox Slight Problem
« Reply #15 on: Sep 12th, 2011, 3:37pm » |
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Dare I ask what the rear centre light is?
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Mike H
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PJDavis
Senior Member
2 x 1995 Jag X300 3.2 / 4.0 (Henley) 1957 XK140
Posts: 1474
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Re: Autobox Slight Problem
« Reply #16 on: Sep 12th, 2011, 5:19pm » |
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On the Pre-Facelift, which mine is despite being registered in August 1998, the centre strip of lights at the rear are reflected right across.
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IP Logged |
I love 'Movvy'
1995 Jaguar XJ6 X300 3.2 (Henley)
1995 Jaguar XJ6 X330 4.0 (Dopey)
1957 Jaguar XK140 USA (converted to RHD, and to have fitted Mk10 420G Engine with BW 65 Auto Trans)
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Mike H
Senior Member
Renault Clio
Posts: 2594
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Re: Autobox Slight Problem
« Reply #17 on: Sep 13th, 2011, 11:54am » |
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Oh what you mean all the stuff across the boot lid?
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Mike H
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PJDavis
Senior Member
2 x 1995 Jag X300 3.2 / 4.0 (Henley) 1957 XK140
Posts: 1474
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Re: Autobox Slight Problem
« Reply #18 on: Sep 13th, 2011, 2:42pm » |
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Aye. 
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IP Logged |
I love 'Movvy'
1995 Jaguar XJ6 X300 3.2 (Henley)
1995 Jaguar XJ6 X330 4.0 (Dopey)
1957 Jaguar XK140 USA (converted to RHD, and to have fitted Mk10 420G Engine with BW 65 Auto Trans)
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Mike H
Senior Member
Renault Clio
Posts: 2594
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Re: Autobox Slight Problem
« Reply #19 on: Sep 14th, 2011, 11:52am » |
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Gotcha. 
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Mike H
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