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Topic: Another weird gearbox problem. (Read 3806 times) |
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Scorp_Kev
Full Member
Scorp Ultima 2.3 1998
 
Posts: 221
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Another weird gearbox problem.
« on: Nov 6th, 2011, 1:20pm » |
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I am now beginning to regret buying this one after another problem has appeared. When cold, it can take a few moments to select reverse. When warm no problems. When cold, drives forward like a dream BUT, if I have to reverse first, it drives like on cobbles very slowly so I select drive and exactly the same, on cobbles. Now for a bit more, I possess one of those cheapo £20 ODB readers, so I plug in and read codes, NONE, so I erase codes anyway. Guess what, it now drives like a dream both ways. I know this is a bit drawn out, but I think I explained it as best I can. HELP please.
Cheers
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leewar
Senior Member
I'm a YaBB newbie!
Posts: 1504
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Re: Another weird gearbox problem.
« Reply #1 on: Nov 6th, 2011, 1:29pm » |
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Kev, Is the oil level low. Does it smell "burnt". When was the gearbox filter last changed. Lee
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Scorp_Kev
Full Member
Scorp Ultima 2.3 1998
Posts: 221
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Re: Another weird gearbox problem.
« Reply #2 on: Nov 6th, 2011, 1:45pm » |
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lleewar
Both oil levels fine (Engine and ATF). No burning smell. Not sure as to filter as quite a new purchase.
BTW, I did PM you re the door pockets
Cheers
Kev
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Tompion
Administrator
1997 2.3 Ultima estate.
Posts: 2918
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Re: Another weird gearbox problem.
« Reply #3 on: Nov 6th, 2011, 3:43pm » |
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It’s not uncommon, mine has always tended to do that in cold weather – so I’ve just lived with it for 50,000mls. It goes onto 2 cylinders. Turning off and waiting a bit usually sorts it.
I just make sure I back into my drive if it’s going to stand overnight & it never causes a problem.
If Dave2302 reads this he’ll probably tell you how to fix it.
I have had codes with it but your reader needs to be able to read advanced codes.
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ABS multiplug wheel sensor pins MK IV or MK 20
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Mike H
Senior Member
Renault Clio
Posts: 2594
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Re: Another weird gearbox problem.
« Reply #4 on: Nov 6th, 2011, 10:57pm » |
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Well, no codes is good. 
New oil and filter probably good idea anyway, unless previous owner was an enthusiast or mechanically astute, as it's the sort of thing that's typically ignored.
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Mike H
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Tompion
Administrator
1997 2.3 Ultima estate.
Posts: 2918
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Re: Another weird gearbox problem.
« Reply #5 on: Nov 7th, 2011, 12:33am » |
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These are the codes I had.
P1701 reverse engagement error
P1749 pressure control solenoid A failed low
P1270 Engine RPM or vehicle speed limiter reached
They’re not always there when the problem occurs & your reader may not see them anyway.
My guess is whatever sticks in the autobox wrongly causes an over rev signal to the ECU which then limits the revs by disabling one of the coil packs &/or injectors.
Changing the oil & filter on mine significantly improved the reverse selection time, but did nothing to improve the other problem.
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ABS multiplug wheel sensor pins MK IV or MK 20
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Scorp_Kev
Full Member
Scorp Ultima 2.3 1998
Posts: 221
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Re: Another weird gearbox problem.
« Reply #6 on: Nov 7th, 2011, 6:09am » |
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When you say "Oil and filter" Do you mean ATF or engine.
Thanks
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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: Another weird gearbox problem.
« Reply #7 on: Nov 7th, 2011, 8:05am » |
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Get the right ATF and a 'Screen-Filter' and sump gasket. You'll need the car up on ramps and remove the Autobox sump, replace screen filter and oil. If just doing the oil from the sump you'll only get about 5 litres out, if you remove hoses from the radiator, and do other things you'll get more out. One thing to remember, when putting the new screen-filter in, make sure the bolt bears up onto the filter, it's too long and will need washers.
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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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Dave2302
Senior Member
2006 Mercedes S55 AMG, Retired Barefoot Waterskier
Posts: 1119
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Re: Another weird gearbox problem.
« Reply #8 on: Nov 7th, 2011, 10:09am » |
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Hi,
This is a very common problem, and as was said, a simple code reader will not see the code, but when you do a code clear it will clear all codes, even un-seen ones.
It can be caused by a few things, and TBH I have never really got to the exact root cause, because I reckon it can be caused by several different faults 
I had an Auto Gearbox Specialist firm for 25 years LOL
First thing is to renew the selector position sensor on the side of the gearbox this has cured a lot of them.
You need a special tool / old wiring plug and multimeter to do this
Failing that a new EPC solenoid in the valve block usually cures the rest of 'em, but extreme cases have had to have an engine / gearbox loom (called Fuel Cut Off Loom by Ford). The insulation breaks down and they short out.
If you don't want to spend money, as has been said, simply stick it back in neutral, let it run for a minute or so and then switch it off and re start it and it should then reverse OK.
HTH 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: Another weird gearbox problem.
« Reply #9 on: Nov 7th, 2011, 1:10pm » |
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Yep could be wiring, which includes the position sensor which is like just a wirewound potentiometer, PCM uses that to know what gear you want to be in.
Have you had the green 'O/D' light flashing?
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Mike H
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Scorp_Kev
Full Member
Scorp Ultima 2.3 1998
Posts: 221
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Re: Another weird gearbox problem.
« Reply #10 on: Nov 8th, 2011, 6:57am » |
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No O/D Light.
I have been quoted £145 for atf and filter and labour. Does seem pricey, but needs doing.
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Dave2302
Senior Member
2006 Mercedes S55 AMG, Retired Barefoot Waterskier
Posts: 1119
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Re: Another weird gearbox problem.
« Reply #11 on: Nov 8th, 2011, 9:08am » |
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Sounds Cheap to me 
Auto Oil is getting dearer by the day
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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: Another weird gearbox problem.
« Reply #12 on: Nov 8th, 2011, 3:04pm » |
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No O/D flashing is good. 
on Nov 6th, 2011, 1:20pm, Scorp_Kev wrote:| When cold, it can take a few moments to select reverse. When warm no problems. |
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FYI handbook says shouldn't take longer than 4 seconds.
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Mike H
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Scorp_Kev
Full Member
Scorp Ultima 2.3 1998
Posts: 221
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Re: Another weird gearbox problem.
« Reply #13 on: Nov 13th, 2011, 8:45am » |
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I thought I would add this as a way to save maybe lots of people wasting money on oil changes.
When speaking to a colleague at work regarding my problem, he informs me that his brother is the parts manager at our local Ford dealer (Dinnages, Worthing) and he could probably get me the filter at family discount. After a chat with him, he came back with the price but said it was very very rare that this needs changing and asked the exact problem. He then had a word with his workshop manager (A scorpio gearbox expert) who came back with. "Before doing all the oil changing, has the front bumper ever been removed". Yes, it suffered from a small accident before I bought the car and has been repaired. He says " There you go. Look behind bumper as the wiring loom which controls gearbox etc runs behind the bumper is prone to corrosion. A wire insulation tidy up should solve your problem"
I await a nice sunny sunday and will let you know
To be continued........
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Mike H
Senior Member
Renault Clio
Posts: 2594
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Re: Another weird gearbox problem.
« Reply #14 on: Nov 13th, 2011, 7:54pm » |
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Yep leccy gremlins, distinct possibility, as the PCM also controls the box.
OK appreciate that the fluid shouldn't need changing on the other hand these cars are now getting old and I can't see fluid lasting >10 years very well
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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: Another weird gearbox problem.
« Reply #15 on: Nov 13th, 2011, 8:02pm » |
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Can we PLEASE STOP using acronyms! PCM?? Those of us ignorant berks that don't know what is being talked about! I have had some gearbox issues since I had the car, but notice that the front bumper has been removed at some point, (it's position isn't exact) I would like to know where this wiring loom is behind the front bumper so I can inspect it. Any help appreciated.
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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
Full Member
Posts: 562
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Re: Another weird gearbox problem.
« Reply #16 on: Nov 13th, 2011, 8:39pm » |
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Powertrain Control Module. HTH, LOL.
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gozz
Senior Member
Been around awhile
Posts: 3475
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Re: Another weird gearbox problem.
« Reply #17 on: Nov 13th, 2011, 11:25pm » |
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The wiring loom is above the bumper clearly in view,there is nothing critical behind the bumper.
GOZZ.
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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: Another weird gearbox problem.
« Reply #18 on: Nov 14th, 2011, 10:13am » |
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The only wiring loom I can see runs behind the front cross-member attached with clips. In amongst that wiring loom on the drivers-side is a wee blanked-in (with a red plug) connector, is that the loom we're talking about?
Thanks, 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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gozz
Senior Member
Been around awhile
Posts: 3475
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Re: Another weird gearbox problem.
« Reply #19 on: Nov 14th, 2011, 10:25am » |
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That's it PJ,it goes from the offside inner wing plug round to the POWERTRAIN CONTROL MODULE That part of the loom is not as badly affected as the parts getting heat from the engine.
GOZZ.
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