XJ XJ6 / XJR6 ( X300 ) 1995-1997

Oil in Air Intake

 
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Old 06-09-2019, 05:41 PM
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Default Oil in Air Intake

XJR6 X300 1996.
Have found oil in air intake from supercharger to intercooler. Supercharger gearbox oil is full, so where could it be coming from? Car is overfuelling to a chronic degree, spark plugs coated with soot to the extent of spark plugs not operating properly. Cleaned spark plugs and found same thing within 5 to 10 kms. Help please! Urgent.
 
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Old 06-09-2019, 06:03 PM
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cylinder compression low from piston ring seal overcoming air / oil separator ?

The blowby oil interferes with the engine regulation sensors including the O2 sensors

The cylinder compression should be something like 115 PSI at 300 RPM starter speed

But that is a factory new specification from Jaguar I once seen someone gave me
 

Last edited by Lady Penelope; 06-09-2019 at 06:23 PM.
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Old 06-09-2019, 06:40 PM
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Thank you
 
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Old 06-10-2019, 03:20 AM
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Dave, if you are reaching the end of your tether, Mark Yates off Watchman Rd in Napier should be able to sort it for you. He has had plenty of practice on my XJR6! And knows his stuff
 
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Old 06-10-2019, 03:44 AM
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Thanks for the info
 
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Old 06-10-2019, 04:52 AM
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Dave,

I would first check your engine oil level is not way overfilled and then check the crankcase breather hose is not excessively oily. I presume there is a pcv installed in the breather hose on a XJR that should be reasonably clean and clear.

It sounds like this problem is new and has not previously been experienced. Have you or your mechanic made any recent changes to the engine? I ask as I have in the past installed a new cam cover gasket in another engine that didn't have the cut out for the breather hose!
 
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Old 06-10-2019, 06:47 AM
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I had overfuelling issues that was sorted out by replacing a TPS that bench tested perfectly fine.

This happened after I:
1. Replaced oxygen sensors
2. Replaced maf
3. Replaced coolant temp sensor
4. Replaced coils with Made In Japan labeled Diamond coils
5. Had injectors professionally cleaned
6. Replaced fuel pressure regulator
7. Replaced camshaft position sensor
8. Replaced crankshaft position sensor
9. Replaced cracked exhaust manifolds
10. Replaced EGR
11. Replaced IACV

And probably a few other items....

If I were to do it again, Iíd start at the TPS....itís a pricey item, but when it goes, apparently thereís no easy way to test it.
 
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Old 06-10-2019, 06:48 AM
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As for the oil in the air intake....itís normal. I ended up installing an oil catch can in my engine bay.

Actually, I should clarify, some oil in the intake is normal? Itíll require you to clean your throttle body because it eventually gets gummed up.

The catch can seems to minimize, but not completely eliminate all oil. I have a very long run of hose connecting the oil catch can mounted just behind the passengers headlights. I thought that would eliminate it 100%, but trace amounts still go through.....

I wasnít cleaning out the can nearly enough, and have been much better about that now. Weíll see what happens.
 

Last edited by Vee; 06-10-2019 at 07:26 AM.
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Old 06-10-2019, 03:13 PM
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Thank you
 
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Old 06-10-2019, 03:14 PM
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Thank you.
 
 
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