hello Jag forum world first and foremost I love this site you guys rock on helping other people with there issues.Thanks to Brutal and others.


OKay I have a 1999 xjr I am experiencing loss of power its almost like the car is lost in A gear when accelerating FIRMLY i ALSO GET AN OCCASIONAL RESTRICTED PERFORMANCE AT A LIGHT OR JUST WHEN PLAIN IDLING .


I personally have changed the MAFS I have done a vacuum line check and replaced lines.also I had a fuel injection flush done yesterday.(THINKING IT WOULD SOLVE THE PROBLEM IT DIDNT)

Now I notice the car does surge when slowing down from highway speeds when coming to a complete stop.i.e at a stop light i will press the gas pedal and the rpm will rev to about 3 and half before the car starts to roll slowly causing the triggering of the gear box fault warning.(feels like its stuck in a higher gear like if I was trying to take off in 2nd or 3rd gear)COLD STARTS ARE THE WORST.
Power cuts out during a sharp Uturn or LEFT OR RIGHT turn and it seems I lose that power at the wheels thus triggering the high reeving rpm's and causing a gearbox fault warning sign to pop up ..

I found myself pulling over alot and restarting the car.But I found this to be dangerous in traffic.and more frequent during cold starts first drive of the day is a pain in the a@#.,because when i put the car in from reverse to drive I have a long hesitation before I get a hard shift in to 1st (D) gear
.

i THOUGHT TRANSMISSION MIGHT BE A PROBLEM BUT WHEN THE CAR RUNS GREAT ON THE HIGHWAY IT SHIFTS PERFECTLY . BUT NOT ON STOP AND GO...SCENARIOS AROUND TOWN....ENGINE LIGHT COMES AND GOES ...BUT i ONLY GET p0730 INCORRECT GEAR RATIO.

COULD THIS BE SYMPTOMS OF A BAD THROTTLE BODY?

OR MAYBE THE SENSOR ARE CORRODED THAT ARE CONNECTED TO THE T.B? I DID SPRAY THEM WITH A LIQUID CALLED (P.B) THAT HELPS WITH ELECTRONICS FROM FREEZING .pedal is much harder now for some reason??

almost always the gas pedal feels like mush and other times it feels hard(this is when I feel the car is working at its best better acceleration and response.)sometime the wheels even chirp off the line but that is accompanied with a hard shift.. ..but ALL DAY LONG These are the WAVE OF SYMPTOMS I AM FEELING FROM THE CAR ON A DAILY BASIS...ITS DRIVING ME NUTS i HAVE YET TO GET FULL POWER FROM THE jAG SOMEONE PLEASE HELP

I DO PLAN ON TAKING THIS TO A SPECIALIST BUT THOUGHT i WOULD HELP WITH PIN POINTING THE PROBLEM FIRST


okay I am expressing on the Jaguar experience I dont think Jaguar Is a bad car actually best car I have ever owned but I was approaching and intersection and the car just happen to coast and ended up in the middle of the intersection .. I couldnt move nor accelerate I had just enough time too turn off the car and rush out of there considering i wasn't getting mercy from the 5 oclock traffic

 

Wow, that sounds awful. I have no knowledge to pass on but you have my hope and best wishes that you can get this fixed for good. My car throws the throttle position sensor code every time there's another code showing. Have you read a computer trouble code on her?

I've found that, at the dealership, they want to replace parts for every code they read without considering one code could cause another to pop up.

 

im going to try the pin service on the TB and see if that helps if not I guess specialist on Monday.

 

I would say look at the transmission again for problems. I had the same exact thing happen to my car, except in reverse, my car felt like the parking brake was on and needed a bit more gas to move. Shifted perfectly on the highway. Driving around town was horrible because my engine would slowly pickup speed, slip out of gear until about 3k rpm and BANG into gear and the cycle would keep repeating. If I was careful on the gas, I could still drive. When I restarted the car, transmission fault would go away, and then return again. I got p0730 for my transmission too. My transmission got worse very rapidly. Transmission failure was the verdict. I have a Vanden Plas which has a different transmission though.

BTW: Your title saying "ALMOST WAS KILLED" should have a story to go along with it to justify shocking everyone and basically sounding a 'forum fire alarm'. Since there is no story in the original post, it should be removed, as it makes a potential Jaguar buyer run away from these cars.

 

wow that is exactly whats going on while driving was it a classic case of a fried gearbox?what did you do to fix it?


ps i stressed on the almost killed part it was the traffic more than anything else sorry not 911 emergency on our Jags

 

My transmission had a cracked A drum. Classic transmission problem on the non supercharged transmissions. I had mine rebuilt. I was PISSED! Not cheap. Apparently, the transmission can be repaired instead of rebuilt for alot less money. This has only recently begun to be discussed on this forum.

My transmission started with the slow reverse to drive shifting, to difficulty reversing and feeling like the brake was on. About a week later, I got the whole slipping out of gear problem. If you want to get it repaired instead of rebuilt, try to not drive the car much until the car is looked at. The transmission will continue damaging itself which will eventually require a mandatory rebuild or replacement.

The 'incorrect gear ratio' code basically means the transmission input speed is not what the output speed should be. So the sensors are either shot or another transmission electrical problem, or a mechanical transmission problem. Basicallly the code is vague. Does your car occasionally drive normally all day and have problems another time? If the transmission problem is sporatic, then MAYBE its just electrical. If it will always slip out of gear unless the gas is feathered, its probably transmission failure/mechanical fault.

Good news is that you have a XJR instead of a XJ8/VDP, because you might not have the classic XJ8/VDP transmission failure due to the different transmission.

Good luck man!

 

it is sporadic if i really mash the gas pedals a couple times it will come up. the gas pedal gets hard then soft through out the driving exp.. highways is an example just the stop and goes is what kills me.This reverse to drive is what boggles me..as of now I am going to check for any lose connection with the TB plugs


when cold is whe it tends to act up..when she starts to warm up its only when i take sharp turns or roundabouts if I dont add too much gas.

 

I suggest you have the transmission fluid level checked. Runs great when on highway but problems when start/stop and moving side to side? Pump will suck air when the fluid is too low and sloshing around in the pan. Fluid expands when warm, more volume, less problems...


Points to low fluid level to me.

 

can a 10 min oil change place be able to do it?i called they said yes for 89.oo but who knows if that is true i hate to waste a trip?



thank you for some reason i wont believe it something serious

 

I don't think so... it does not have a dipstick and requires a very exacting procedure to get it to the proper level - go to an expert.

I hope it is as simple as low fluid level, but brace yourself for the possibility that it is something worse. Overall, the XJR tranny is much more bulletproof than the XJ8, so odds may be with you.

 

I assume you have in limping mode, a similar loss of accleration happened to me on my Jag , it hardly moved just stuck in 3rd gear and when you put in reverse you could hear some sort of clunking .

I was stopping the car and restarting the engine it was fine but eventually I had to get it fixed because that failure was repetaing itself quite frequently more than ever

 

I think Quad could be onto something, get the fluid level checked in the gearbox. It might only need a half quart in there, you mentioned it does weird things turning left or right, this could be another symptom of the pumps in the box not getting oil. Listen for clicking sounds as you turn from the trans, an ear to the middle of the car. I'd go to a Jag specialist to have it checked, not a 10 min oil change outfit, they are Mercedes gearboxes, usually bullet proof.

I'd want to know why the throttle pedal goes hard and soft. This is also something the specialist can help with, it could just be a case of new cable and setting it. It could also be a faulty T.B. as electrics probs always show themselves when its cold. How old is the battery?

Either way, you have a combination of faults that you've driven with that once fixed will be like a night and day experience.

I hope its fixed soon, good luck.

 

IMO you need to go to a specialist or a dealer who has the proper diagnostic tools to tell you what is up. It sounds like you may have more than one problem. I definitely would not be spraying anything into any sensors unless I was sure that the problem pointed to them.

When you first feel a problem with a transmission you need to have it checked out -- you do not want to drive it or especially stress it with high RPMs.

Good Luck

 

I tell you what I here a ticking noice just during idling my car is parked in a incline so I am assumiing that is the pump ..i so feel like I am gettin warmer how much is a trans fluid replacement or top off only the dealer or a specialist? is able to help? thanks guys!

 

Yes -- you need to take it to someone who knows what they are doing. A ticking can be anything - and coming from another part. Even someone who is familiar with this transmission in another car may not be able to help you as they do not have the equipment to check out the Jaguar computers that run the transmission.

If you are really lucky and it is somehow just low on fluid - that will be the end of it. If it is low on fluid - driving it will damage the transmission.

Taking it someplace and having the fluid changed without determining what is wrong is a waste of money

 

One thing to be aware of - IF it does turn out to be a low fluid issue, the next question has to be - WHY? How did the fluid level drop? Unless there is an overt leak somewhere, or it was just not properly filled at a fluid change in the past, tranny fluid doesn't evaporate and disappear.

Filling to the proper level may make the symptoms dissapear, but not necessarily the cause of the fluid loss.

 

well I have bitten the bullet I am going in tomorrow for the transmission service which is removing fluid and replacing gaskets for 350 I hope this is alright I called aamco for a service they said 89.00 could they be mistaken?

 

I hope this resolves your issue... good luck!

 

well I forgot to mention something thats why I am so convinced its fluid.
if i am speeding and come to a complete stop at stop sign ....
I have to wait a few seconds for the trans to catch up if not the car just rev until until the gear kicks in ., maybe fluid and pumps are struggling to circulate ?


*****update it is the fluid it was very low leakage is fixed thank god I just found out it is a rebuilt trans nice How lucky am I!

 

very, unless there was some damage done by the low fluid condition, harsh gear changes, etc.

Plz follow up after a month or two of driving and let us know if it behaves normally again.