Had an error code which showed a bad injector (#7 cylinder). The Jag mechanic said that he needed to take off the supercharger and that it would be better to do all the plugs, coils and injectors which is going to cost a pile of money. The car has done 120,000 kilometers. Do you think I should get them all done or just the faulty one? Also, is it necessary to take off the supercharger to get to the injectors?
Am looking at a total of $5,000 for the total replacement.
Thanks

 

I would seek a second opinion before agreeing to drop that kind of money on what may prove to be a much less compromising problem....

 

The spark plugs and ignition coils are not related to removing the supercharger. They can be done at any time and are very easy to replace.
I just did all my spark plugs (includes removal of ignition coils) last week on my XKR. There would be no reason the replace the ignition coils unless you are having issues.

 

I agree, get another opinion. Removing the supercharger is a lot of labor, but it is ONLY required to get access to the injectors, not the plug or coils. There, there is no need to replace those unless needed.

Injectors do not fail very often, so I would just replace the bad one. An apparent injector failure could also be a wiring fault, or a misdiagnosis.

 

What was the code?

Gus
www.jagrepair.com

 

The error codes are:
P0307
P1316
P0207
Thanks for the comments. I guess replacing the entire set would be a waste, but I still need to remove the supercharger to replace the injector. Is it possible to find out whether or not it's just faulty wiring or a loose connection without taking off the supercharger?

 

Use this reference diagram for what I'm about to say:




I don't know how well access is to the wiring for the injectors from memory, but I think you might be able to get the electrical connector off of it with the SC on. I think 7 would be the one behind the oil fill cap on my cars. You can test voltage to the injector, resistance of the injector and make a guess.

If the injector is good, pull the coil cover, check the wiring. If that looks good, pull the cylinder number 7 coil, pull the plug there too. If the plug looks good, put it back in and move the number seven coil to another cylinder, say cylinder 3. If the P0307 turns into P0303, we can say with a decent degree of confidence the coil's shat the bed.

I personally did have the number 7 coil crap the bed a few years back. My coolant overflow tank above it went on the seam (crappy hotplate welded plastic), and it leaked coolant all over there. The coil cover has a chintzy seal that went and let the coolant in, killing the coil. I replaced the tank and within maybe 30 miles, I got the P0307 code. I did not get the accompanying injector code though.

 

Thank you for the heads-up. I'm going to talk to the mechanic this Saturday and see if he will check the voltage and resistance of the #7 injector. I really hope it's a coil or a plug; that would save me big bucks.

 

In my travels here since 2009 I have seen FEW threads/posts for bad injectors. I would have to think it is something else on yours??

 

Do you get this P0207 every time you start the car?

If the codes are intermittent I would use BG44K fuel additive and see if it frees up the gunk on the injector. If the code is every time I would first check your battery with a load tester then look at your #7 plug and or coilpack. I do believe your injector is possibly bad but this way you could eliminate a few of the easy things first. I would hate to see you pull supercharger and find it was not the injector.

 

[QUOTE=Gus;1414784]Do you get this P0207 every time you start the car?

Gus, yes, it comes up each time. I did try some injector cleaner but no luck. The battery is new so no problems there. Will try to check the voltage to the injectors and check the plug and coils. The mechanic assures me his OBD scanner showed an injector issue but I wonder if even sophisticated OBD's can distinguish between faulty injectors, coils and plugs.

 

If it does end up being an injector, I'd be extremely tempted to rebuild the supercharger:

Jaguar XJR XKR M112 Eaton supercharger Rebuild Rotor Pack Bearings Seals 4 0L | eBay

Check to make sure there isn't a better price, but if it's off, I'd be doing that. I am doing that with both of my cars this spring (both have 93k miles).

If that supercharger comes off, without any doubt: DO THE OCTOPUS HOSE. DO IT. DO IT NOW.