I need to take my 1996 Jaguar in for a shifting problem and
"The tech stated you are not supposed to clean the throttle body on those cars due to the special coating on the inside of the throttle body, he does not feel this is affecting the shifting. The diagnosis to start is $119.50 plus tax. You can email me directly if you would like to schedule an appointment".

Has anyone hear of this "special coating" on the inside of this Throttle body or should I be wary of this place. its a dealership.

 

Lot's of people around here clean them. Mine was cleaned twice by the previous owner at his local dealership, Jaguar of Marin.

Don't know about a special coating...

 

I was also told that these were not servicable. This is simply untrue,do not buy into this,My 96 has had the tb cleaned twice and it ran wonderfully afterwards. I was experiencing the throttle sticking slightly,not very hard but if I just lifted my foot off the gas she just kept going at the rate it was before I lifted off the gas. I had my local dealer look at it and he told me I would have to replace the TB...$900.00 for the part alone. I asked a local import repair shop and he said that cleaning these was a matter of maintenace and both times it was cleaned made a big difference. 50,000 km intervals in case you wondered.I hope this helps...Jamie

 

The X300 throttles are intended to be cleaned!!!!!!!!!!!! The newer throttles (electronic throttle assys) have a coating. Here is an excerpt from a recall for the V8 throttles S514

Note: The new
throttle body has a
Molykote coating and
cannot be cleaned.
The new throttle
bodies can be
identified by a sticker.

This is on page 8 and I will include it.

The TSB 03.1-15 has the procedure for cleaning the AJ16 throttles on pages 1 and 2.

The 'TECH' you refer to needs to have the correct model and year before determining what can be cleaned and what cannot. (back to school)

bob gauff

 

You would think that an experienced Jaguar mechanic would try cleaning an X300 throttle body.

Check around your area for a non-dealer that you can trust to actually service your car and not just change parts.

 

Hi any info on cleaning the Throttle body on my 1997 XK8??? Thanks Paintxpert

 

Hi Paint, our 4.0L's are spread across only 6, not 8 bores, and all aligned. Not sure but I suspect significantly different throttle-body.

Try these:
https://www.jaguarforums.com/forum/x...tterfly-50506/

https://www.jaguarforums.com/forum/x...000-xj8-40624/

 

I have always cleaned the straight six throttle bodies. Never the 4.0 V8's. I just cleaned mine this past week. I cleaned it a couple months ago but was not happy with how it ran afterwards. It took me a while to get back to it. I removed it entirely from the engine this time around and gave it a thorough cleaning. When those cars were coming into the dealership, we would clean them to help the sticky throttles on the car. There is also a breather tube update that Jag put out to help with the oil film on the back of the throttle plate. I like the idea that my car has not had that update. It caused other problems when it got old. I would recommend removing the throttle body. You cannot get it clean enough sometimes even with small hands. Don't try to remove the idle motor screws as most of the time the loctite on them would cause the bolts to break and now you really needed a new throttle body. I considered replacing mine cause I found an awesome price on them but it has been good since the cleaning. So, with all that said, keep the six cylinder t/body's clean and don't touch the 4.0 V8 throttle bodies.

 

If you do want to remove the IACV you need to heat the screw thread area to loosen the thread locking compound. The throttle needs to be removed to make sure you have access to the area where the screws are mounted. I have 4 or 5 throttles that still have the snapped screws and 3 or 4 that I rescued from the trash bin because the screws were protruding enough to grab and remove the broken stubs. It's all about finesse and not brute force.

Sometimes you cannot coax a stubborn screw from the threaded hole and just admit defeat!!!

bob gauff

 

Thanks for all the info on cleaning the throttle body of my 4.0. It runs a bit rough when cold....clears right up after warm up. I see some say NEVER clean this type, yet others are at least wiping them out. I must say I am a bit confused what to do. So I am opting to leave it alone. I am of the adage, if it aint broke dont fix it. Thanks again to all who replied and the moderator who does a SUPERB job here!!!! Thanks Again! Paintxpert

 

Lol i clean them all, hot, soft tooth brush and rag. Very little cleaner and it does not remove the coating. There is another special service message or email from jaguar that the main concern is cleaner going past the throttle bores and into the electronics (tps, throttle motor) this is also much harder since the later throttle bodies are horizontal instead of verticle like the xj6. Just dont go nuts spraying cleaner everywhere. Which greatly suffered from sticking throttles. I loved that kit and wish it was still avail because it did a great job of controlling the oil vapor that leads to dirty sticking throttles. But its no longer made and that plastic seperator cracks and leaks vacuum(plastic not last long???go figure, who would have known) thats why i had to take mine off and go back to original. And of course my throttle is sticking again.
Go bob go, good info again

 

Hi there, I seem to be in the same situation with the shifting problem, only between 3 en 4th gear though , did you have any luck on solving the problem, my best guess would still be the TPS ? Did you ever think of the ECU or TCM ? Please let me know how your doing, would help me a lot, gr

 

Ended up being a rubbed wire, which shorted the kick down switch. once that was replaced it never ran better!

 

Just keep in mind that if the AJ16 throttle body is disturbed, adjusted or cleaned, for everything to be completely copacetic again the throttle pot adaption app really needs to be run with WDS or IDS.

For those with the V8 throttle body that has the molybdenum coating, the attached bulletin has the cleaners that are acceptable to use on them.

Cheers,

 

hmm....

"do not clean! but these are the approved cleaning products."

amazing logic there ... worthy of Abbot & Costello.

Seems like the main concern is that the cleaning product be silicone free: