My name is kevin, and i have a 2003 x type 2.5l jaguar. I have owned the car for about 8 months. I bought the car with a bad radiator and had that replaced. I have a common problem that i have read on here a lot. It is reading lean on banks a and b. I have replaced the maf sensor, new radiator tank cap, new o rings on the two outer intake manifolds, main hose from air, and just replaced brake booster hose. Before the radiator replacement, it didn't stall. Now, it stalls once then starts. It chugs when i get on the throttle when driving and is getting bad gas mileage. I am at about my wits and wallets end. I have replaced everything that could be causing a vacuum leak. Anyone have any idea what else it could be? I have cleared the engine code repeatedly, but it makes it run at higher rpm and not shift right. Then engine light will come back on after it is turned off. Please help

 

Welcome to the forum Kevin.

From what you've done I'll assume you've seen these threads
https://www.jaguarforums.com/forum/x...ilable-128085/
https://www.jaguarforums.com/forum/x...4-mean-108315/

I'm not sure what the 'main hose to air' is - if it is the pvc hose, then you have hit the big three for vacuum leaks.
The next item would be the upper and lower intake manifold o-rings.
video on how to replace upper & lower gaskets on a xtype (thanks the magicjuan17)

I would also do a hard reset to clear the long term and short term fuel trims. You don't mention any misfire codes but while changing the intake o-rings at least check the spark plugs.

 

Kevin, I am by no means a mechanic and others on this forum know a lot about the car but I didnt have a misfire issue and in the process of replacing the coils i found there was a broken vacuum hose. I dont know if it would cause the issue you are having but there is no way i would have found it if I didnt have to take off the intake manifold. Here is a post that shows the problem. http://www.jaguarforum.com/showthread.php?t=55512

 

Sorry that should have read, I DID have a misfire issue.

 

Here's another to check in regards to subtle vacuum leaks...
https://www.jaguarforums.com/forum/x...anifold-71249/
HTHs
Gary

 

Can you post the code(s) you are getting? That could help possibly narrow down your issue.

 

Breather hose was what i was referring to as the main hose. I replaced all the parts on jaghelp.com: Jaguar X-type common vacuum leaks. P0171 and P0174 po171 and po174 are the codes that are reading, and they pertain to what has been replaced as in the link. I haven't went through and changed upper and lower gaskets and plugs. From what ive read it should be one of the three spots and or the maf sensor. Thanks for all the feed back too, very appreciated

 

Kevin: The breather hose you refer to is more commonly called the PCV hose (for positive crankcase ventilation). It reduces hydrocarbon emissions by sucking crankcase fumes into the engine where they're burned, instead of venting the fumes to the outside air.

By chance, when you removed the intake manifold, did you tilt the intake and see engine oil dribbling out? When more than a thin film of oil is inside the manifold, try replacing the PCV valve. It's atop the front valve cover, connected to the PCV hose, costs $10-20, and takes only a few minutes to replace.

The PCV valve regulates the amount of crankcase air sucked into the intake manifold. An old PCV valve can get stuck in the open position, allowing too much crankcase air into the intake, causing a lean condition. The telltale indicators are excess oil in the intake manifold, and sometimes lean error codes that don't clear even after you fix the more common leak culprits: IMT O-rings, PCV hose, brake vacuum line, intake manifold gaskets, cracked vacuum hoses, loose intake manifold hose connectors.