Ok, I have tried many things in the forum including the clean connectors and contacts, ck wires....twice now I have found that when i have removed the throttle body there is an oily substance on the bottom side of the throttle blade. just prior to removing the throttle body I have used carb cleaner and wiped the inside out as far as I can reach. sometimes this is a momentary fix. this time it didnt. So back to the body. just simply wiping this off and putting it back together semms to help for several months of daily driving. I dont know where this oily residue comes from, but this is what i have found. Hope this helps others, if nothing else, at least temporarily till someone has a better answer.

 

Lee, the oil comes from the oil vapor line. Atleast on the X-Type, that runs from the fire wall side valve cover to the air box. Then it gets sucked into the engine to be burned. Hence why you are seeing the oil there.

By the way, welcome to the JagForums. Please stop by the "New Member" forums and introduce yourself. There's lots of good guys around here and you will find out a lot about your vehicle. I think you will also find it well worth your time too.

 

As Thermo rightly says, the oily residue is caused by crankcase ventilation, being there to introduce the crankcase fumes into the air inlet to the engine, instead of being vented to air as they used to be before the world obsession on emissions. The engine then burns the fumes.
However, as an engine gets older and older, these fumes get to be more and more evident. This is due to inevitable wear of pistons, rings, bores, and the consequent blow-by.
It may be time to think of the next weight of engine oil at the next oil change. If using 5W30, you would move to 10W40 as an instance. The penalty is supposed to be a slight worsening of fuel consumption, but personally I've never been able to measure it. Cranking in very cold weather will be a little slower of course.
When engine oil consumption gets to be noticeable, you have another clue as to the level of crankcase fumes. Jaguar engines are notable for using very little oil indeed from oil change to oil change.
Leedsman.

 

i wold mostly agree with you guys but the oil int he engine is much darker. the oil on the bottom of the blade looks like brand new oil. just a light amber color. oil in the engine is very dark brown....anyway, i shot my mouth off too quickly. right back to the limp mode again. i went ahead and ordered another throttle body from a used supplier. It will have a one year warranty at least....thanks for the replys though.

 

If you are talking about XK/XJ AJ27 fault with the P0121 material mismatch TSB 303-58 then here it is. Cleaning the connectors might work for a while but the fault was different metals in the connectors.

bob gauff

 

Which may be why removing the throttle body helped. Every time it was removed, the disconnection and reconnection cleaned up the contacts enough to be usable for a while.

Late 70's Autolite electronic ignitions suffered from a shutoff condition when hot on certain models. The warranty fix was to replace the distributor. That would work for a while until the next distributor replacement.

That is, until a certain shop helper who feared retiming distributors discovered that cutting off the molex connector and soldering the wires together resulted in a permanent fix. It wasn't the module, it wasn't the distributor, it was connectors expanding with the underhood heat in July. The manufacturer issued a new TSB with the much cheaper fix

 

hey thanks. i have gone through the electrical connectors (all of them) before but didnt seem to help. I used electrical contact cleaner and slightly bent the tangs so they would touch a little tighter when connected. But did you 'replace' the tin with the gold plated? and if i ask the dealer about this tsb they can get me the correct parts? Thanks for your reply, got me started thinking again!