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Jaguar XJ-Series: Sudden Acceleration

27 messages,  Last post on Dec 11, 2008 at 8:42 PM

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What is this discussion about? Jaguar XJ-Series, Transmission, Sedan

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#22 of 27 Re: Jaguar acceleration [gt502] by Mr_Shiftright HOST Aug 01, 2007 (6:16 am)
Replying to: gt502 (Jul 11, 2007 8:15 pm) Did you have the car checked for brake failure? The brakes should have easily been able to stop the car from a standing-start acceleration, even with the gas pedal mashed to the floor. No engine can overpower modern fully-functioning brakes from a starting start. Replies to this message: british_rover (Aug 01, 2007 2:45 pm) Mr_Shiftright (Aug 02, 2007 1:27 pm)
#23 of 27 Re: Jaguar acceleration [Mr_Shiftright] by british_rover Aug 01, 2007 (2:45 pm)
Replying to: Mr_Shiftright (Aug 01, 2007 6:16 am) Exactly Jeep did this back in the mid 90s with the Cherokees and Grand Cherokees.   People said that they were having sudden acceleration problems and that the brakes wouldn't stop the car.   They did several tests with the gas all the way to the floor, 4wd engaged and the brake pedal fully depressed. They didn't move a bit just sat there nearly blowing the transmission up. Replies to this message: Mr_Shiftright (Aug 02, 2007 1:27 pm)
#24 of 27 Re: Jaguar acceleration [british_rover] by Mr_Shiftright HOST Aug 02, 2007 (1:27 pm)
Replying to: british_rover (Aug 01, 2007 2:45 pm) I suppose the engine management system and the brake system could fail simultaneously, and then the brake system could revert back perfect working order right after the collision, but boy, it's a real stretch to figure out how that could possibly happen.? Would a lack of vacuum still permit the driver to stop the car at full throttle? I think it would but you'd really have to stand on that pedal.
#25 of 27 Re: Jaguar XJ Series: Problems and Solutions [redrockbunny] by djagman Jul 25, 2008 (10:44 pm)
Replying to: redrockbunny (Dec 03, 2003 5:53 pm) I AM A FACTORY TRAINED JAGUAR TECH.AND I WRECKED A 2001 XK8 ON A TEST DRIVE.THE COUSTOMER STED THAT IT HAD A MIND OF ITS OWN.I JUST TOUTCHED THE THROTLE AND IT LUNGED FORWARD AND HIT A NEW AUDI.6000.00 DAMAGE.I CALLED JAGUAR AND THEY INFORMED ME THAT IT WAS A PROBLEM.THE THROTLE BY WIRE TOOK OVER AS DID THE ABS AND SMASH.I DID NOT EVEN GET A TALKING TO!? DJAGMAN Replies to this message: OME_OMY (Dec 11, 2008 8:42 pm)
#26 of 27 Re: Jaguar acceleration [larry67] by OME_OMY Dec 11, 2008 (8:18 pm)
Replying to: larry67 (Jul 05, 2007 11:42 am) Add yet another (ME) to the list of uncontrolled acceleration. This is going to sound bizarre to all of you because i experienced this in my 1994 XJ6. I can't bother whether you are anyone believes me, but alone, i went out to my cherry car in a parking lot, after a session in a nice casino on the poker table. I turned the ignition on and suddenly the engine went to an astronomical RPM scaring me to immediately turn the ignition off. I had not touched the accelerator at all. i was out of town, late at night, and needed to drive home, so i tried it again with the same result. i did try to tap the accelerator to decrease the rpm on this second crazy time. That didn't help. This was all in park. I got out to look under the hood for a stuck linkage and found it to be normal in movement. On the third attempt, it started like normal, amazing me. no accident, but scary. This same thing happened one more time since. this 94 is all jaguar original equipment with regards to carb, computer, electrical, engine, trans, etc. no further action taken. I wish i just had a general idea of what is going on before i get in a wreck. Being a mechanical engineer, and electronics knowledgeable, i have a theory that can't be proved. But hopefully we all find out what is going on. I think it is a computer problem. And to replace the computer might not help anything at all.
#27 of 27 Re: Jaguar XJ Series: Problems and Solutions [djagman] by OME_OMY Dec 11, 2008 (8:42 pm)
Replying to: djagman (Jul 25, 2008 10:44 pm) hey DJAGMAN,   What is "THROTLE BY WIRE" that you put in your message?   Also, Could faulty ABS feed into the computer be our culprit? A defective ABS sensor or defective ABS sensor wire could send panic signals to computer. Just a theory from other peeps experiences. Computer glitches of all kinds related to ABS problems and ABS trouble lights.

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