Vee ,

I do remember when someone read their's TPS wire as o.67 and the idle was fine that you were involved with.

And it did make sense here at the Institute of Ponderance that the ECU would learn the TPS drift over time

Or was the original factory orientation or matching

 

Dear All,

Am still waiting for parts to arrive. Car grounded for over two weeks so took it out for a spin to see if the car would stall after a long drive in highway and city traffic. However, car drove like a dream and idled steadily at 750 rpm with no irregular signs. Am rethinking what the real culprit is for the occasional stall.

 

The feeling in the pit of your stomach is what confirms that it hasn’t fixed itself!
For what it’s worth, my long and painful journey to a new TPS included days where it worked fine. Sometimes days on end when it worked fine, and then……!
I should say though that my issue was the textbook high idle, not cutting out, but they could both be attributable logically to the same root cause .

 

Many thanks, and I think you are right.　Come to think of it, I have almost replaced/renewed everything on this car so it would not hurt to replace the TPS as well. Just bought a factory new TPS from "Jaguar Land Rover Classic Parts" which is offering a 20% discount for Spring purchases Hopefully, the TPS along other parts to be replaced while removing the in-take manifold will put a stop to the long and winding pain of mysterious idle and sudden stalling.

 

Folks, here is an update. As wife was worried about possible random stalling which all occurred during night driving, I left Rose (my XJR) standing for a few weeks and used another car while I waited for the new parts to arrive - these included a set of inlet manifold gasket (EBC11081), a throttle return spring (NBB3131AB), a brand new idle air control valve (JLM12185) and a new genuine throttle position sensor (JLM12074). Although the parts eventually arrived, my mechanic was unable to find time for Rose. As I still have some doubts about the TPS being the primary cause of the random stalling, I resumed using Rose as my daily to see under what circumstances she would stall and when. For four weeks in a row there was not even one stalling, but during the fourth week, there were a few occasions that the engine speed trembled momentarily below 750 rpm, but there was no stalling, and when this happened Rose also had sudden high idle which would return normal if I bleed the gas pedal (sign of a gummed throttle or a dying throttle return spring), and Rose idled steadily most of the time. Then, after many weeks of normal driving, Rose suddenly died due to a mysterious and abrupt loss of engine oil - will start another thread about the oil leak.