GM4L80E Aut. gearbox (Jaguar V12 X300 1995)

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  #1  
Old 10-06-18, 01:21 PM
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GM4L80E Aut. gearbox (Jaguar V12 X300 1995)

My auto gearbox on my old lovely Jaguar has the following problem.When I start the cold engine, the car drives 3-800 meters, after which the gearbox is in malfunction. Thus, the fault light starts to light and the car is running only in 2, gear and rear gear.when the engine has driven a few km.more and got a little hotter I stop the engine, restarts and the car is running perfectly for the rest of the day.So if it does not stand still for so long that it gets rigidly cold.Has changed oil and filter on gearbox without result.Is there any one in this forum that has a good advice to a Danishman from Copenhagen ??In advance thank you! Regards. Per Greibe Soerensen
 
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Old 10-06-18, 01:29 PM
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Welcome to the forums.

That's quite a sophisticated car and I'm quite sure most of us here can't offer you much help in your repair efforts. Have you tried any more local groups for repair help ?
 
  #3  
Old 10-06-18, 03:34 PM
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should be some way to get the codes out of it for a starting point, shift solenoids seem to be one issue that could be causing it to go in limp mode if you have any local transmission shops they may be of some help while they may not be to familiar with jaguar they are probably very familiar with the gm transmission.
 
  #4  
Old 10-06-18, 03:55 PM
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Keep in mind..... this is in Denmark.
 
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Old 10-07-18, 04:25 AM
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  #6  
Old 10-07-18, 10:05 AM
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I know I'm far away from Denmark.My problem is that, there are very few of these cars and gearboxes in Denmark that use this gearbox, and there are a lot in USA.Both 12 cyl.Jaguar and other US cars with this gearbox.I could easily go to a specialist, but now it's so that I like to do it myself.In fact, I'm also pretty good for the most things. Therefore, I was inspired by the name "do it yourself" I think - there is always a chanche for as an expert passing who had just experienced my problem, right?
 
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Old 10-07-18, 11:50 AM
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Right. Expert will be in a Jaguar forum. Not here.
 
  #8  
Old 10-09-18, 05:12 PM
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Solenoids

You are in luck, I have a bit of knowledge on day to day cars, but also have worked on exotics (my hobby car is a 30 year old red car, those who understand what flatcrank means would probably guess the origin of my member name ) and quirky old euro cars...

The Jaguar transmission is indeed a common GM unit, and a nice heavy duty unit often used in trucks. Also was in Bently's, Jaguars and the Aston DB7.

It is a fully electronic (electromechanical) transmission, meaning there are I believe 8 solenoids that do most of the work. You probably have a solenoid failure. Solenoids are just magnets, with a plunger and spring assembly. They can be replaced with the transmission in the car.

When your car sticks in second gear, the computer has put you in "limp" mode. It is probably the TCC (torque converter clutch) or the shift solenoid. Pretty simple to fix.

(looks like this https://www.ebay.com/itm/34326EROS-4...2283:rk:1:pf:0)

You can use an ohm meter, and check the two wires coming out of each solenoid. If you get no reading, the magnet winding wire has broken, typically due to vibration.

If you get a low reading, the wires may have melted from a short, often from a voltage surge. Did you recently have a battery go flat or an alternator replaced?

A good solenoid would read about 20 to 30 ohms.

Here is a guide that will help you locate where each solenoid is...and everything else you want to know about your transmission!

http://www.jagrepair.com/images/Trai...s/200_1996.pdf

Note the limp home mode on page 52 of the pdf file, describes your situation, other diagnostics in that section as well.


(PS My wife is Danish, I was told to say Jeg er Sulten when I met the now inlaws and we got on very well ever since!)
 

Last edited by flatcrank; 10-09-18 at 05:29 PM.
  #9  
Old 10-10-18, 01:14 PM
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I searched for GM 4L80E on youtube and found a lot of videos on how to assemble and service these transmissions. You might want to check a few to see if any of the videos answers your question.
 
  #10  
Old Yesterday, 10:42 AM
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Thank you for your help, I have already ordered the parts. Hope I can do it myself. Giv også din hustru et stort kram fra mig og hendes gamle land...
 
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