Xjr stuck in limp home mode

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Jul 16, 2009 | 07:20 PM

craigod

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Xjr stuck in limp home mode

I have a 1996 xjr supercharged that is in limp mode. I have no warning lights or error codes. Someone on another forum said it could be the rear transmission mount which has come loose and putting a strain on the wiring loom from the trani ecu. Does anyone here agree? How easy is it to fix? Any help greatly appreciated. Thanks. Craig

Jul 16, 2009 | 10:37 PM

kraziegreggz

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From: Miami Beach, Fl

What exactly do you mean by "limp mode"? Just to give us a better idea. The rear tranny mount seems to be an issue in these X300 XJR cars, I'm told. I have an XJ6 with a grinding noise when in 3rd gear, and have been told by specialists the mount is to blame. Looking to replace that soon and see if it disappears.

Jul 17, 2009 | 06:26 AM

craigod

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The car wont go above 30mph!

Jul 17, 2009 | 08:12 AM

GTBentley85

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From: Fort Lauderdale, FL

hello, I had a similar problem on my 96 XJ6, except mine wouldnt exceed 50mph and the car would jerk like crazy. But I also had the check engine light come up. I had a misfire on Cylinder 3, but if you dont have a code it is most likely a wire, or mount.

Jul 17, 2009 | 02:45 PM

craigod

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Garage are saying now they dont think it is stuck in limp mode. When in neutral it revs up fine, put it into drive and it will take off like a rocket but once you hit 30mph it just loses power and goes no faster. Still no error codes or warning lights!

Jul 17, 2009 | 11:17 PM

sparkenzap

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From: atlanta ga

Craig:
So why are you discounting the transmission wiring connector?
BTW, my other guess is a plugged fuel filter or pump inlet screen.

Jul 18, 2009 | 04:56 AM

craigod

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Thanks for the info! I have passed it on to the mechanic, will post back and let you know how I get on. Craig.

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Jul 18, 2009 | 04:18 PM

XjJagXjJeepDriver

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Well since were on the subject of 1996 XJRs I might as well bring up a similar problem with mine. There's a nearby speedway that puts on an enormous car show and lets anyone with any type of vehicle pay $5 a run to go down an 8th mile track against another car.

Did it twice with the XJR6. Roared like it should have and had trac control off.

However, very weird feeling on the way home. Serious lack of power just moving up to 30 mph from a dead stop. Once it was going on highway it seemed OK. But heard something clanking around from passenger front side...

Needless to say got home looked under car and I had sheared off what I think is my serpentine belt....awesome right? Sorta would make sense since my fog lights and parking lights went out half way home(30 min drive) by themselves. Serpentine belt is what repowers alternator or something right? Only thing is not definite since the small pulley at the front of the Supercharger is where there is no longer a belt around...

So what happened my serpentine belt fly off that pulley as well as the other 2 or 3 in front of motor or did my Supercharger pulley fly off? One of the two has to be why it felt underpowered....someone help...just got back from a week in California and my Jag is sitting in garage with no belt being unloved...

Jul 18, 2009 | 04:20 PM

XjJagXjJeepDriver

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also no check engine lights or codes whatsoever have come on that night or since

Jul 18, 2009 | 08:41 PM

#10

sparkenzap

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From: atlanta ga

jeeps and Jags

XjJagXjJeepDriver:
You do realize the water pump is belt driven, right?
BTW, you and I have similiar taste in cars. sorta biploar, huh?

Jul 19, 2009 | 08:58 PM

#11

XjJagXjJeepDriver

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Quote:

Originally Posted by sparkenzap

XjJagXjJeepDriver:
You do realize the water pump is belt driven, right?
BTW, you and I have similiar taste in cars. sorta biploar, huh?

haha yea it appears so doesnt it? I have had half a dozen Jeep Cherokees over the last few years to keep the good car off the road in the winters. Love them, I6 motors forever! I always stick to the 1990-1992 models with the Laredo and Limited trim level. Alot of mine I have had beefed up to offroading as well.

Oh yes I realized how dumb I was about the Jag belt too... My main drive belt is fine now that I looked at it all more in detail. It controls my alternator, water pump, power steering, and AC. The belt that definitely went flying off is the one attached to my Supercharger. Very depressing, but that explains why it felt so underpowered about a week ago when I drove it home that night. It was a normal XJ6...lol. Either way Im ordering that belt tomorrow morning that belongs on the two pulleys and also wraps around the 2 inbetween idler pulleys. The XJR will be back up to par soon enough!

Aug 1, 2009 | 05:25 AM

#12

craigod

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Still no luck with my xjr. It still wont go above 30mph, no error codes or warning lights. The rear transmission mount has been checked and is fine, so is the wiring loom from the transmission. Its a mystery!