XJR 1999 - Cylinder misfire

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XJR 1999 - Cylinder misfire

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XJR 1999 - Cylinder misfire - 3/1/2008 9:51:31 AM

Ernest

Posts: 19
Joined: 3/1/2008
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Good day all you Jaguar experts.

I am new in this forum and relating on your advise. My XJR seems to have a major problem: When I started the car after a couple of days without driving it, a heavy cloud of smoke came out of the exhausts. The display showed RESTRICTED PERFORMANCE. I changed the sparkplugs and at that occasion I tested the compression of all cylinders. All showed about 8 to 9 bar but cylinder 7 only about 2 bar. An OBD II test gave the following error readings:

P0307 Cylinder 7 misfire
P1346 Unknown fault
P0222 Knock sensor bank 2

After this test I checked engine oil and cooling water. Both in good state, no mix.
Please give me some advise what the problem is and how I can overcome it without changing the complete engine as it was done during the manufacturers guarantee. Best regards in advance

Ernest from South Africa

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Ernest

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RE: XJR 1999 - Cylinder misfire - 3/1/2008 9:58:38 AM

Ernest

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Sorry. The error code reads P0333 Knock sensor bank 2

Ernest

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RE: XJR 1999 - Cylinder misfire - 3/1/2008 4:18:03 PM

FactoryJaguarTech

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If Cyliner 7 only has 30 psi, I think you may be stuck. The other 7 cylinders all show about 120psi which is normal. Before condeming anything though, I would do a cylinder leakage test to see where the compression is leaking.
I wouldn't worry about the knock sensor code yet. You will need to replace it likely as normally the code is only there when knock sensor is bad. Make sure you torque it down well. It is a crappy job as the supercharger needs to come off. However, if you end up replacing engine due to the lack of compression, it is easier to do it out of the car.
Hope it works out for the better. Anyway, do a cylinder leakage test (cylinder pressure differential test you may call it) and repost with results. Possibly leaking out a valve, head gasket or exhaust. If you dont know how to tell where it is leaking, let us know. Sounds like you are a mechanic of some sort anyway, so you should be ok.

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RE: XJR 1999 - Cylinder misfire - 3/2/2008 2:46:19 AM

Ernest

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Joined: 3/1/2008
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Thank you for your prompt reply. No, I have only little knowledge about the high sophistication of a car like the Jag, but I try to do it because I cannot trust the South African Jaguar workshop in Cape Town after having made my experience. Please can you describe in detail how to make the cylinder leakage test

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Ernest

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RE: XJR 1999 - Cylinder misfire - 3/2/2008 11:24:45 AM

FactoryJaguarTech

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Sorry to hear that you are having problems with your dealer. The car is not that sophisticated really. An engine is an engine and you are having basic engine problems.
You need a cylinder leakage tester. You hook it up to compressed air and thread it into spark plug hole. You then see if it holds the air that you put in there. If it is leaking, you look in coolant reservoir see if it is bubbling, feel at exhaust to see if leaking that way or check to see if leaking through intake.
First off you need the tester. Rest is easy.

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RE: XJR 1999 - Cylinder misfire - 3/2/2008 2:51:15 PM

Ernest

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Thank you for the way of executing the cylinder leakage test. As soon as I have done so I will report to you. Once again thank you.

Ernest

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Ernest

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RE: XJR 1999 - Cylinder misfire - 3/13/2008 2:02:38 PM

Ernest

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I have done the cylinder leakage test three times just to be sure that it is a leaking piston on cylinder 7 as I suspected. About 8000 kms back the same happened at cylinder 3 and Jaguar Cape Town put in new rings on piston 7. It costed me a fortune for this work and I had to wait hardly 3 months to get the car back. I never drive the car to the limit. I can't understand why this happened. Are the cylinders in the center, near the supercharger thermically higher stressed than the outer ones? Can I do the job myself altough I have only a very normal garage, no bit, no hoisting equipment. Can I get the piston out under these conditions? And if yes, which special tools do I need? Looking forward to get good hints!

Ernest

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RE: XJR 1999 - Cylinder misfire - 3/13/2008 4:22:35 PM

jag_genius

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so where is it leaking from? if it is piston then will have to remove engine from car

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RE: XJR 1999 - Cylinder misfire - 3/13/2008 4:25:14 PM

FactoryJaguarTech

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You can do engine swap with basic tools. The piston replacement will be far more indepth and will require special tools.
Do you have junk yards there? Engine swap much better option than swapping piston unless you are willing to do some major work.

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RE: XJR 1999 - Cylinder misfire - 3/13/2008 8:05:01 PM

ibjags

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I"d defiently go Eng Swap Before Pistons lol
Just make sure the engine your getting has a warranty of some type before you purchase it and understand that warranty completely before you purchase and install engine

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Post #: 10