I have a 91 sovereign transmission problem it runs and drives it drives in drive it will not downshift it will not upshift, can somebody please help me figure out this problem, also it does clunk hard when putting into reverse

 

What is the number of kilometres/miles on the vehicle?

Has any work recently been done to the engine or gearbox?

What is the level and condition of the gearbox fluid?

 

130000 miles,fluid full and red

 

Just replaced fuel pump

 

Have you changed the fluid and filter?

If the fluid and filter are new, from what you describe as symptoms, there may be a problem with the valve body.

 

Welcome to the forum Thumprr1226,

I've moved your question from General Tech Help to XJ40 forum. This is the place to post technical questions about your model.

Please follow this link New Member Area - Intro a MUST - Jaguar Forums - Jaguar Enthusiasts Forum to the New Member Area - Intro a MUST forum and post some information about yourself and your vehicle for all members to see. In return you'll get a proper welcome and some useful advice about posting to the forum.

Graham

 

I will change filter and fluid to start.

 

Also sport mode does not work

 

Hi Thumprr1226,

Welcome to the Jaguar Forums!

Is the transmission fault warning lamp illuminated in the instrument cluster? If so, your transmission is in Limp Home Mode (LHM), which locks it in 3rd gear. On our '93, the most common cause of LHM was oil contamination of the electrical connector for the Throttle Position Sensor (TPS). This connector clips to a bracket on the intake manifold elbow just to the left of the throttle body. Separate the two halves and flush them with zero-residue contact cleaner (CRC is a well-known brand). Allow to dry and reconnect.

Regarding the clunk when you put it in Reverse, what is your engine rpm at idle?

Cheers,

Don

 

engine rpm about 850

 

do you have a picture?

 

do i have to disconnect the battery?

 

Your idle is too high - it should be closer to 650-700 rpm. You may have a vacuum leak or a problem with the Idle Air Control Valve (IACV). See the photo albums at the link in my signature for information about cleaning the IACV.

Don

 

I don't have a picture of the transmission warning lamp, but your Driver's Handbook/Owner's Manual probably contains an illustration. Basically, the light looks like the outline of a transmission housing, possibly with an X through it, and if I recall correctly, it is on the left edge of the instrument cluster.

 

You do not have to disconnect the battery to clean the TPS connector - just leave the key out of the ignition.

 

That didn't fix it.

 

The connector was dry,not the problen.

 

Are you certain you checked the correct connector?

Is the transmission warning lamp illuminated?

 

Yes it was dry.has like 7 wires attached to the tps

 

Check engine light is on.