Hi All, some may remember I wanted to report a positive repair I received from Jaguar dealer. Well that was short lived as my limp mode gremlins have appeared again to my disappointment. 2 mechanics and a jag dealer later and I have a limp mode problem. Its pointing to an ABS/PCM comms problem. Jag said the repaired a wiring problem in the harness. However this has come back to haunt me. Oh well, maybe it was a bad idea to buy a jag. Looks like a have a lemon on my hands.

 

Hmmm are you the original owner of the vehicle? If you are not, I am just trying to get a basis as why you would state that you have a lemon. Maybe a previous owner had an accident, or modified something or caused the wiring problem.

 

Is this the car with the wrong wheels/tyres fitted? No wonder you have problems!

 

Yeah but its a Jaguar, that's why its a lemon.

 

Yes I have the incorrect wheels. Trying desperately to source correct ones. Any help greatly appreciated. I am based in SW London...

Spoke to chap last night who has many years experience with Jags and he said Limp mode very like to be a Throttle problem. I explained I have recently had a NEW JAG TPS installed and he thinks Pedal is sending wrong signals to the unit. Which might explain why I get the Idle jumping from a calm 500rpm to near 1000rpm. Then very likely LIMP MODE!! And errors.

 

He also did say it could be many things, but ABS would NOT throw the car in LIMP MODE. And give me a christmas tree dash.

 

He's out of his depth. You get specific codes for the throttle and others for the pedal. Don't listen to a well-meaning but ignorant man.

You now sound to have a power problem such as a flattish or old battery.

 

The chap is an idiot.

The S Type will NOT tolerate different diameter tires or a change in rear end ratios without going into limp home mode. It is suppose to do that.

Until you get the non-stock tires and rims fixed I would not do anything.

Any chance you bought the car this way? Maybe the other owner never could figure out that tire/rim problem?
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New battery fitted 6 months ago. I need to get an ODB reader to get codes. Im trying to source new wheels. Will the 275/40/18's incorrect rears throw the car into LIMP MODE?

 

Who is going to know? Who will have fitted such wrong wheels?

My thinking is yes because ABS cannot cope with wrong wheels.

 

Dupe....

https://www.jaguarforums.com/forum/s...wheels-139797/

 

Yes I did buy the car this way. Also, can I activate the fold-in wing mirrors? when in Park?

 

Yes If your car has power folding mirrors. The handbook tells you how to do it.

So give it a try. Here in the US folding mirrors seem to be a rare option.
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Still trying like crazy to source 245/40/18 wheels. (Same as front). Looks like the bright spark before me fancied a set of XK Alloys without knowing whether the car would tolerate them or not... If it turns out to be the wheels which are the start and end of my LIMP MODE problems, I swear I will eat my hat! :-) As I have had a lot of grief up to this point with 2 mechanics and a Jag dealer!

 

Any scrapyard may have them, also try ebay for breakers

 

I am worried about buying crap as I am not experienced with these things. Although Im still on the look out! :-)