I have been trying to isolate a fault in my 1995 3.2L X300.
The initial fault was that it would not start..engine just coughed and tried to start, chugging away but not firing, no response to the throttle. No codes on scanner.
I cleaned the MAFS and it finally started,rev'd up to 1500 with no throttle, hunted a bit, then settled to 700 and responds to throttle normally. This lumpy starting sequence happens each morning when engine is cold, but it starts normally for the rest of the day once warmed up.
However, ocassionally the engine cuts out while running, check engine light comes on, but recovers instantly if you give it some throttle.Initially it seemed only when foot was off throttle, but has happened a couple of times under acceleration.
I've replaced the MAFS with new, cleaned the throttle body, cleaned coolant temperature sensor, checked all earths, had battery checked out.
Now suspect throttle position sensor.
Any thoughts from you experts out there?
I have read that replacements are hard to find, and need to be calibrated by dealer only. Is this true?
All thought appreciated.
Thanks,
Phil...'95 #.2L X300

 

Hello JagQueen,
I had the same thing with my 1997 x300 4litre it would run perfect and then suddenly cut out,on restarting it would run rough then after a few mins at 1500 rpm it would then run smooth this went on for a long time very frustrating to say the least as you I replaced the coolant sensor cleaned earth,ecu,all sensor connections,checked and replaced various relays.
I was advised to look at the body control module I reluctantly removed it and disconnected the wiring.
The problem was obvious ! FOUR of the pins on the module were totally covered by white deposits,oxidation,excited I immediately cleaned with a fine file and washed with an electrical contact cleaner.
Connected and started engine would you believe it no more cutting out with the engine running smoother,more power and improved gear change not to mention better mpg.
My car is right hand drive the body control module is located in the passenger side foot well behind the glove compartment if you lay down in the foot well you will see it held by four bolts.
Please let me know if this has helped.

 

I agree with RSG, as my 3.2 is sometimes hissy, and when I can get twisted enough I will also be doing that module seek and clean.

The TPS is becoming a bit more common now as age catches up with them.

The 3.2 being a NON electronic trans should NOT require dealer intervention, I MAY BE WRONG, so wait for more NON USA answers (they did NOT get the mighty 3.2).

The 4.0 has an electronic trans, so orientation of the TPS by the dealer is required.

I have had my TPS off and cleaned with solvent, which sorted heaps of issues in the early days, and NO issues at all.

 

Hi Grant,
I had too remove TB and TPS to clean,after reassembling the idle shot up-to
1500 rpm.
I removed TPS,very carefully drilled and slotted the holes in the tps to allow for adjustment,reinstalled tightened just enough to allow movement then made sure the TB and throttle plate gap was 2thou.
Start engine and rotate TPS in small increments when the correct idle is achieved back probe TPS and get the voltage as close to .6 volt without the rpms jumping up and your done.
I done this a few years ago and the car has been fine with out having to take it to a Jaguar main dealer.

 

AHA.

Now I will have a reason to fiddle with my car, instead of her V12. THANK YOU.

I replaced those dumb screws for the TPS with 6mm hex headed bolts, so the oil filter can stay put whilst adjusting that sucker. Now I know what is what it will be done, soon I hope.

Will definately be easier than getting at that ECU under the glovebox.

 

Hi Grant,
the body control module behind the glove box is very easy to see and to remove no more than 10 mins I promise you and if the pins have corrosion after cleaning them you will have a much better car to drive,false economy not to !

 

what does it look like?? is it about 6 inches in diameter??

 

UMMMMM.

What does what look like, or have I missed something???.

Also, you are NEW, so welcome, but PLEASE expand what you are asking about and answers will flow thick and fast.