Hello. I just finished replacing the two coolant hoses that run under the supercharger, so I had to pull the supercharger. I got it back together and it fired up immediately. It seemed fine except for a bit of "hunting". I figured the "hunting" was due to the computer calibrating itself. I let it idle for a while and then stopped for the night. The next day, my brother took it for a drive and stopped for fuel. He said he put premium fuel in it as normal. After the stop, it started running rough. I presume it went into "limp" mode. Got it home and checked for codes, there were 10. They all have to do with the even numbered cylinders, injector circuit malfunction and cylinder misfire - 2, 4, 6 and 8. Please see codes below. Thoughts?

One thing. One of the hoses that runs under the supercharger burst, leading to the replacement. I do not know if the car overheated. It would have been nice if Jaguar had installed an actual temperature gauge. By the way, Swallows Racing in the UK source cool replacement hoses in silicone and they are less expensive than the OEM Jaguar hoses. Check them out if you need the hoses. Swallows Jaguar Specialist | Servicing, Performance & Motorsport for JLR

Vehicle:
2009 XKR with 4.2l engine

Codes thrown:
P0316: Misfire on startup
P0302: Misfire cylinder 2
P0304: Misfire cylinder 4
P0306: Misfire cylinder 6
P0308: Misfire cylinder 8
P0202: Injector Circuit Malfunction in cylinder 2
P0204: Injector Circuit Malfunction in cylinder 4
P0206: Injector Circuit Malfunction in cylinder 6
P0208: Injector Circuit Malfunction in cylinder 8

Also, where are the vacuum lines supposed to be attached for the fittings in the attached photos? One goes to the Fuel Injection Pressure Sensor, one is about halfway down the top right of the supercharger and the last, unknown part, was attached to the intercooler crossover hose with a clip. I hardly touched this part and it broke off the clip. There were no lines attached to any of these when I started taking everything apart. I did find pieces of the original lines, but they appear to have disintegrated long ago.

Thank you in advance for your input.

Thanks,
Andy

Fuel_Injection_Pressure_Sensor_01

Fuel_Injection_Pressure_Sensor_02

Fuel_Injection_Pressure_Sensor_03

Fuel_Injection_Pressure_Sensor_04

Supercharger_Vacuum_Port_01

Supercharger_Vacuum_Port_02

Supercharger_Vacuum_Port_03

Swallows_Racing_Coolant_Hoses

Swallows_Racing_Throttle_Body_Intake_Crossover_Sea ling_Rings

Unknown_Part

 

Update: The injector circuit malfunction turned out to be a connector that worked loose.

I'm still curious about the vacuum lines though. No one has any idea about these lines? See below and the attached photos.

Also, where are the vacuum lines supposed to be attached for the fittings in the attached photos? One goes to the Fuel Injection Pressure Sensor, one is about halfway down the top right of the supercharger and the last, unknown part, was attached to the intercooler crossover hose with a clip. I hardly touched this part and it broke off the clip. There were no lines attached to any of these when I started taking everything apart. I did find pieces of the original lines, but they appear to have disintegrated long ago.

 

Hope you get an answer I am also after a definitive layout for the vacuum lines

 

ChiefyO,

Someone out there must know something these lines. I cannot find any vacuum diagrams. I think I'll start a new post.


Thanks,
Andy

 

I can speak to the similar lines in the 4.2 NA. The material in these thin lines are crap, and weak as cobwebs by this point. Yours are broken close enough to their connectors that they would need the proper diameter male-male connectors to create a new vacuum hose with standard vacuum hose. That said, keep the connectors to manufacture a solution if you can't find the original part. There are parts (like the one near your fuel pressure sensor) that can allow you to recreate a system.

I assume you're getting a new one. I don't know the PN on the XKR, but the connections should be similar.

In mine, the lines connect a fitting on my single throttle body to two legs. One leg goes to the fuel pressure sensor, the other leg to two points near the front for the secondary air system near the radiator (in my case, the AIR system vacuum tank and the AIR control valve). You may have others. The "unknown part" is a one-way valve that keeps the AIR vacuum tank pressurized with the car is shut off. The part is 3 in the illustration below. Note the illustration is wrong: there are two connectors at the top of the pipe: the throttle body, and the fuel pressure sensor.

Obviously, them being open is a major vacuum leak. Should trigger a lot of codes, according to the 4.2 maintenance manual.

BTW, really nice work on the silicone lines. Can you post a source and PN's? Thanks

Good luck.

 

Thank you for the diagram. Number 3 is what I need. My Jaguar dealer say they can get it.

I don't have the secondary air system so I have to think that I could simply run a new piece of hose from the supercharger vacuum port (in my case) directly to the fuel pressure sensor. Because I do not have the secondary air system, that leg is capped and therefore a dead end.