So a cursory review of my posting history will reveal a whole host of troubles I've had with my car. Specifically, a while ago I had my throttle body changed with a rebuilt one from JayTan. Well JayTan has since gone under (probably for giving out **** throttle bodies) and predictably they aren't around to honor the warranty I still have one mine.

I was getting P1122 and P1121 on it so I gave up and brought it into the dealership who says I need a new throttle body.

I *really* cannot afford a new TB (a $2,325 part). If I were to replace it I would in all likely be to get it running so I could turn around and sell it and that seemingly inevitable path seems to be my only one.

Is there any way I can repair the thing? I'm not afraid of a soldering iron, I am an engineer after all.

 

I can't speak as to the specifics of the repair, but did you try bbareman or ASI? Both of those companies rebuild most engine management components and prices are usually between $250 and $750, depending on the specific component. I've use bbareman for several parts (ABS controllers, throttle bodies) and they always do a bangup job.

 

I could try another brand, I just am really nervous about installing another **** part in my car. JayTan was, after all, recommended to me by this forum.

 

Can't argue that. I believe both BBA and ASI offer warranties on their work, and both have been around for a good long while. I sent them the ABS block from my Saab 9-3 back in '07, so they've at least been around that long. I think it's always nice to support forum members (on any forum) when you can, but there's always a downside to supporting "some guy" versus "a real business" - maybe in the quality of the work, maybe in the long term support, and maybe both...

 

The code is triggered by a fault in the Throttle Position sensor (either no or low output that doesn't match the the values of the MAF).

Other Jags have similar problems with throttle bodies failing but usually the fault lies in the TPS.

The TPS has a rubber gasket that can be deteriorated by heat over time and oil and dirt can enter the TPS and cause erratic readings (such as P1122 and P1122 fault codes).

One of the ways I've repaired all of the throttle bodies is by removing the TPS (usually 2 "5 star" screws on the side opposite of the throttle body motor. Remove the cover on the TPS and spray like crazy with some ELECTRIC PARTS CLEANER. When I did this a bunch of visible dirt and oil was removed. Then clean both the male and female connectors thoroughly with the same cleaner. Afterwards add a ring of PERMATEX ULTRA BLACK GASKET MAKER around the TPS and reinstall. Would also be a good time to clean the throttle body plate as well.

This has consistently worked with the throttle bodies I've repaired on different Jaguar models so I really hope it works for you! Definitely worth a try. My X-Type had become unmovable for more than a few feet and would just go into limp mode and 45K miles after performing this cleaning my throttle body is still perfect.

 

Check this thread for an investigation we did on my XK8 Throttle Body:

https://www.jaguarforums.com/forum/x...acement-77560/

It's a ridiculous situation that the twin track TPS wears out rendering the entire TB a lump of scrap but the TPS is not available as a separate component.

Graham

 

If you go for ATE, they have a better offer on ebay at 325 dollars versus 489.
1999 00 01 2002 Jaguar XK8 99 03 XJ8 Throttle Body Assembly Repair XW939E926AE | eBay

I have now 3 throttle bodies and I can risk cleaning one as recommended above.

 

check your PMS
I have a TB for you