Further instruction to your answer XJ8 Jaguar gearbox fault.

Don't mess with it and take round to yer local Jag mechanic right away before ya blow the hell out of it and you'll be up for thousands of $ instead of a coupla hundred.

Hello
Could need an update for the gearbox , if the right transmission was installed

you need to get the fault codes out of the the tcm.ie, transmission control module with a scan tool suitable for your car. i think you have a problem within the gearbox or its control module, the fluid level and condition ie smell of burn {which indicates slipping clutches etc} should be checked first, which could indicate.mechanical problems the control module in your zf auto box is within the gearrbox, i dont think there is a self fix answer to your problem you need expert help, hope this was helpfull to you. cheers.

Jaguar wont rev 3000 rpm Questions & Answers - Fixya

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1998 Jaguar XJ8 won't rev over 3000 rpm ... Wont go beyong 3000 Revs s type 2001, wont go beyond 3000 Revs and it' in limp ... Question about 2002 X-Type ... My jaguar xjr8 year 2000 battery went dead started car went for short drive back ...

Jaguar engine cuts 3000 rpm Questions & Answers - Fixya

www.fixya.com > Forum > Tags > engine cuts 3000 rpm

1998 Jaguar XJ8 won't rev over 3000 rpm ... engine cuts out and shudders at 3000 rpm won't accelerateobd code p0332 2002 jaguar x type 3.0 l P0332 - Knock ... Car is boging out in park and will not go over ... driving, don't worry about it.

Rev Won't go up

www.jaguarforum.com/showthread.php?t=14662

What are the torque specs for ? , I need more info to give you an answer. There are hundreds of torque answers for a car like the jaguar xj8 are we talking motor bolts or power torque ? The motor on a naturally aspirated is 290 ft.pds.

check the grounds to the ECM mate you got a ground fault going to it

the ecu is damaged. take it to the dealer. you MUST be very careful when jumping these vehicles.

I would make sure the fluid maintenance is done. The most likely cause is the transmission or transfer case is gone internally.
I would take the vehicle to the transmission shop.

Good Luck

Suggest you get the TCU codes read (Jaguar dealer or well equipped auto box specialist). Suggest you don't go component changing without a believable diagnosis, could be TCU, could be pressure or speed/load sensors, lots of things, many not as expensive as a new TCU!

I had the same issue with my 2001 XJ8 and ended up having to have the car rewired from the engine to the battery. I was charged about $300 from a independent automotive electrician. Unfortunately this was after having a new starter and alternator installed! I was told that there were 2 or 3 service bulletins on this issue from Jaguar.

Good luck on this one, it's very frustating and had my car in the shop for about 3 weeks trying to figure this one out.