Greetings all,

I installed a K&N filter recently in my 2001 XJ8. Recently = a week ago or so. Today, "restricted performance" showed up, so as my check engine light. I will be reading the code(s) tomorrow (my reader is at a friend) but in the meantime, anyone think there could be a link? Hope not.... I love my K&N !

Cheers

Brian

 

Most likely is linked - change followed by a thrown code is usually not coincidental.

 

Was your K&N dripping in oil?

 

Maf cleaner

 

To expand the shorthand above - there are a lot of threads where excess oil from this type of air filter has got onto the MAF sensor.
Hopefully it hasn't wrecked it and cleaning (search for MAF cleanning or look in the Stickies) will fix things.
You'll need to get rid of the excess oil though.

 

The filter Blue XJ was def not oil soaked as I gave it to him as had a spare that was the wrong model for my XJR. My XJR runs a K&N and Quintec elbow and have had no problems at all. I spoke to our XKR owning friend who is also a Jaguar service agent, he said the K&N should not throw codes. Agree that the MAF could be dirty and with increased airflow the trim of the sensor could be out but the oil may not be coming from the filter it could be residual from the breather. Still Maf clean would not hurt.

 

That rules out the oil, I suppose some junk could have got in during the install though - as you say a careful clean doesn't cost anything while we wait for the codes.

 

Did you get the codes yet and what are they?

 

Thanks all for your answers. As Rob' said, the filter he kindly handed over to me was not soaked in oil. I cleaned the MAF and thought for a while that all was back to normal.... until the dreaded restricted performance and check engine light came back on. Before I share the codes, what I did find out is that I had quite an oily crankcase breather hose - which by the way broke (like brittle) when I took apart. Temporary fix with tape, but will need replacing regardless. Here the codes now:

P0333 Knock sensor 2 circuit high input (bank 2)
P0456 EVAP Emission Control system leak (very small)
P1111 (jag specific, but appears to be "air" related from what I have been reading)

So, for certain, I need to replace the crankcase breather hose. No discussion there. Might take care of the P0456 - and who knows, maybe everything else. Yet, my issue appeared before I broke the hose, but it may have been craked before. The "oily" side of my breather / air pipe is what is concerning me the most to be honest.

What I wanted to add is that my "restricted performace" seems to appear more at idle than driving.

Thoughts welcome.

Cheers

Brian

 

Now that you have documented the codes clear them and see if they come back. The P0333 Knock sensor 2 is one of two reasons a real knock or a bad sensor. Had you cleaned the engine with water? If so change the knock sensor first. If it is real it could be anything and that would include bad gas. As for the P0456 check all your Purge pipe, hoses and gas cap. The P1111 is a system check.

Link OBD Codes http://jagrepair.com/images/AutoRepa..._2001_OBD2.pdf

 

Don't worry too much about the oil residue in the crank breather as all cars have residue. If you find it hard to get a breather hose we can chat at the weekend about where to try. Sorry you are having problems.

 

Thanks Robert (and all). Good news is that since yesterday all is clear (did not do anything special). I have ordered a new crankcase breather hose and should be receiving it soon (found a folk in CA selling OEM part for $25). My broken one has to be replaced anyway. In the meantime, all is looking good :-)

Cheers

Brian

 

So far, so good folks. No resurrection of the restricted performance or the check engine light. Something just crossed my mind though... it escaped me that the P0456 error code I had originally was related to bank 2.... which actually the OTHER side than the crankcase breather I broke and replacing. Because all my error codes appeared and disappeared together, they were to be related, somehow. Hence me thinking now that I may have a leak in my Bank 2 breather ?!? which is a longer hose, going straight to the throttle if not mistaking. I will inspect that too. OR, nothing to do at all with all this and can be related to other stuff like Gus mentioned earlier. Oh well, at the end of the day, I am happy I can hold onto the K&N !

Next, I need to fix my cabin heater... getting cold in NC! I have another (used) auxiliary heater pump that I need to replace, assuming that is my problem. Another thread to follow soon I am sure

Brian

 

I might have to change the subject matter as I am still unsure if it's related (probably not), but my restricted perofrmance and check engine light came back on. Happened after revving 4k+ and appeared once down to idling. I spent 2 days roughly driving below 3k RPM at all times and all was fine. Now, though, restricted performance remains on permanantly. Same codes show up as before (see thread trail), but got an additional one, P1642. I did some reading about the P1642 and can be everything and nothing. I only just replaced my crankcase hose breather (bank A) so will see what happens. But my error message is "knocking" related on bank B.... Anyway, I'm going to remove battery negative wire to reset all, check around for other possible "air leaks" and see what happens.

Robert - see you tomorrow. We can discuss more

Cheers

 

I sometimes get restricted performace on my 2.7 diesel Jaguar turn off ignition and it clears any ideas ?

 

So.... after putting up WAY too long with reading "restricted Performance" and code P0333, I finally got around replacing my bank B knock sensor... took me 20 minutes, at most, and at a cost of $25 for the (new) part found on Ebay. So far, so good - no more message or code!! I think this may have done the trick.

Cheers

 

your p0456 will be back because youve done nothing to fix it yet. It has nothing to do with with the engine side of the purge valve. The system check is for everything between the gas cap and the purge valve. Lines, hoses, seal, gas tank, charcoal cannisters etc...its not a breather hose on the enigne. that would be a p0171, p0174, lean engine codes

 

Everytime i used the drop in K&N, i got a restricted performance. Now...it could be the oil in the filter, or it could be that the seal just after the MAF isnt secure and leaking in air. Check that first.