Holy S%^T! What a horror movie. Who did it while TB was installed and what did you do to get the job done, YOU CANNOT GET IN THERE at least all my tries so far, thanks in advance.

 

I just took tb off. Didn't realize how simple it was.

 

Got it in and noticed the connector the to throttle servo literally disintegrated when I unplugged it and it was cracked all the way around, getting new connector next, that may have been the issue all along I noticed when I unplugged it when car was running I go that EVERYTHING fault 5 mph crap again. WOW. Taking it for 60 minute test run to see if anything comes back.

 

My apologies, but just one small thing - What on earth are you talking about?

 

I changes the TPS (Throttle Position Sensor) today. Was trying to do it IN car but took out TB (Throttle Body) Then after putting it all back together I noticed the plug connector for the throttle servo literally brake into pieces when i unplugged it.

 

Since it is IMPOSSIBLE to set the tps with the 5 sides bit when it is installed I put studs and nuts on so it can be tightened once on car after adjustment.

 

The torx bots are a PIA, but I just went to True Value Hardware, matched the thread pitch and used allen head bolts. Easy change out. BTW, I ordered a new TPS from ebay and it was some made in China POS. Could not get it calibrated. Tolerances were WIDE...so I cleaned the original TPS wipers with electronic spray and actuated the wipers in the TPS a dozen or more times. Rinsed again with electronic cleaner and shot the wipers with a very light lube made for electronics. Mounted the clean TPS and started the claibration. Much better calibration process. But it is a real Denso unit. Idle in-gear is 650 RPM. Accelerates well. All that cleaning stuff can be found at Home Depot.

 

What is the procedure for calibration please?

I think you have to set it to 0.5v at the zero (closed) point?

 

 

I got mine from AIP. I also did it by ear but my idle is too low. Have to redo it. My cold starts the idle flares briefly to 1700 then settles down.

 

The TPS is held on with screws through slots.
Maybe twist it in the slots slightly to give it correct idle?

 

My cold start=1300RPM...idles down in about 30 seconds=800RPM...in gear=650-670 RPM.
Adjusting idle was done by loosening the (2) small bolts holding the TPS in place and slowly turn the TPS body until you are satisfied with the RPMs. I adjusted mine with engine at normal operating temperature. Patience is the key. And beer.

 

Now the magic question. How on earth did you get the bot in there to loosen/tighten the screws. I had to put studs and bolts in there and can BARELY get a wrench on it?

 

I'm going through same thing tonight. On XJR the throttle body at back of motor. Most post here are XJ8 where TB is at front of engine.
How did you get TB out? I had hell just getting the air tunnel intake to TB out that runs between inter-cooler.
Have you seen any post on this procedure?

 

Its a little tight and uncomfortable unless you remove the wipers and the plastic cover under them. If you do this you will have more room and better visibility, overall much more comfortable. You can do it without removing the wipers and cover though; you can access the 4 bolts that hold down the TB to the plenum using an extended socket, it think they were 8mm? A small ratchet will work, but after doing this so many times I bought an electric ratchet, so no cranking involved. Its very convenient and comes in handy for other tight areas in our engine bays.

Once you remove the 4 bolts on each corner of the TB, you will also have to slide the 2 small coolant hoses off (secured with spring clamps). The clamps are tricky to get off, but easier if you have already removed the 4 bolts and are able to rotate or move the TB in a position that gives you easier access to them.

After the bolts and hoses come off, you should be able to pull out the TB (assuming you already disconnected the harnesses from the start).

 

I ended up finding this issue with our TPS.

Fix the moisture problem getting into the TPS housing.

http://www.jaguarforums.com/forum/xj...-fault-209761/