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  #1  
Old 01-08-2015, 04:21 PM
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Join Date: Mar 2007
Location: Maryland
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Transmission Question

On a very cold morning I drove my '94 E420 to work, drove fine. When I went to come home it kept 'slipping' out of gear. I would start to move, then the transmission would disengage. Put it into neutral, back into drive, wait for it to engage, then start again and it would disengage again. Tried it around the parking lot for 10 minutes, kept happening, The same happened regardless of the gear I put it into, but if I put it into first and started off slowly I could get moving, then I would carefully upshift and I was able to get home. By the time I got home, everything seemed normal, no problems. Checked the transmission fluid, it was fine.

For what it's worth the shifts have been occasionally rough for the last few years, but nothing terrible.

Any ideas? Similar experiences?

Thanks!! -- Greg

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  #2  
Old 01-08-2015, 04:37 PM
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Low pressure comes to mind. Clogged filter, worn pump, or several other things could be the cause.
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83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 401,xxx miles
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88 Jaguar XJS V12 94,xxx miles. Work in progress.
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  #3  
Old 01-08-2015, 05:59 PM
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What pump would that be?
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  #4  
Old 01-08-2015, 06:06 PM
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The main pump at the front of the transmission.
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Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar.

83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 401,xxx miles
08 Suzuki GSX-R600 M4 Slip-on 26,xxx miles
88 Jaguar XJS V12 94,xxx miles. Work in progress.
99 Mazda Miata 183,xxx miles.
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  #5  
Old 01-08-2015, 06:29 PM
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Sorry for being dense, are you talking about the torque converter? The vacuum box/modulator?

Thanks -- Greg
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  #6  
Old 01-08-2015, 06:36 PM
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The transmission has a transmission fluid pump at the front of the trans that is turned by the engine. I would try a transmission service including a fluid and filter change.
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  #7  
Old 01-08-2015, 06:41 PM
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Yes, a fresh fluid and filter change is the base starting point. Then we'll go from there.

Old fluid can cause a lot of shifting issues with the 722.3 transmission.


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  #8  
Old 01-08-2015, 06:51 PM
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You haven't even told us the mileage yet. We have no reason to guess.

Change the fluid first, it's important you do that anyway if it's been awhile. If it doesn't improve from there, report back.

Also, tell us how the fluid looks. Does it smell burnt? Any particles in the fluid?
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  #9  
Old 01-09-2015, 04:49 AM
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Quote:
Originally Posted by gcstein View Post
Sorry for being dense, are you talking about the torque converter? The vacuum box/modulator?

Thanks -- Greg
The pump is behind the torque convertor. You have to remove the transmission to get at it, so a fluid and filter change is a good and much cheaper and easier first step.

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Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar.

83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 401,xxx miles
08 Suzuki GSX-R600 M4 Slip-on 26,xxx miles
88 Jaguar XJS V12 94,xxx miles. Work in progress.
99 Mazda Miata 183,xxx miles.
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