Has anyone any knowledge on blanking the egr valve on the 2004 XJR. I'm putting mine back together after replacing the Knock sensors , cam cover gaskets, and just about everything else in there. As I'm putting things back together I'm cleaning all the parts and the elbow is really black with crud from the EGR. Now I would love to stop this horrid muck recirculating through the intake and let the engine breath clean air. The valve is vacum operated with what appears to be an electrical sensor for the position of the valve. Now if it is just a position sensor I should be able to blank the gas flow without causing a fault code ? or dose it measure the gas flow as well in which case I dont think I can diable the flow without causing an error code.
Anyone tried this ??

 

What will you do about the codes it will probably throw?

Also, it will run hotter in the cylinders and may cause severe damage. Are you OK with that?

Being in the UK (EU) it is illegal. And a mod you'd have to tell your insurer about.

 

Thanks for not answering my question allpoints you made i am aware of hence asking if anyone had done it. Cylinder temp increase is very small its all to do with cheating the emissions down by changing the hydrocarbon of the burn. I just wanted to know if anyone had done this as there are benifits to not poluting the charge with exhaust . Do you know for sure it will throw a code ? that is what I am asking not the legal implications .

 

No-one will have done it for the reasons given.

 

Yes it will throw a code and check engine light.

 

Thanks Cambo, thats what i needed , been doing some digging and found that it is quite a piece of kit and definitly not one that I can get around. Oh well It has taken me 2 1/2 hrs to clean the Elbow out of all the muck that has coated it and the throttle body, hence the question. Seems the car has done lots of short trips for about 2 years according to the previous owner. So lots of cleaning on everything as I reassemble the parts.

 

Part of the I/M verification has the ECM command the EGR on during deceleration. The MAP sensor looks for a pressure pulse in the intake tract. If there's a pulse the I/M completes. No pulse triggers an EGR code and the EGR monitor will not set.

A lot of the gunk could be coming from the PCV system.

 

Thanks for the detailed info. Jim that is great info on this system that I have not found in that detail in any of the jaguar liturature I have. PCV system seems clean above the elbow? So not sure what is causing it. It dose look like it is all 12 years of acumulated gunk so won't panic over it as all cleaned now. The rhrottle body was very dirty underneath to the point of it new measures 1.5mm wider once cleaned and the air gap around the butterfly is about twice the size so that should help.

 

It seems that it can be done with one small side affect, of a delayed return to idle !
Read through this thread the final orafice size on the bypass tube is on post 44 ,

https://www.jaguarforums.com/forum/j...r-valve-34453/

 

Hi Datsports , read through this thread , but he is working on the 200my car which has a different MAP and elbow set up to the one on the later 4.2's which is a shame. It looks like the EGR is going to stay due to it's relationship to the MAP and the ECU requiring certain inputs to match or be within ranges from both sensors at different vacum and throttle settings Hence the 6 wire connection on the EGR i suppose. Looking through avos's threads the systems have become more and more intertwinned as the years have gone on. I knew I should have got an early 6 cylinder XJR much simpler in the engine bay but laking in the interior comforts !!!

 

Um I think you miss read , avos stated he just blanked the 2000xkr with blanking plates as his version of xkr doesn't have the map senser . and he has done this bypass by blanking the exhaust hole , and running a bypass pipe from the egr hot flex pipe to the intake elbow between the maf and the TB on a customers 03 s type r with the restricted oriface finally tuned to 4.5 to 5mm hole ! This means leaving the egr valve in situation still communicating its actions with the ecm , and just breathing metered fresh air in throu the egr valve . I'm guessing the 04xjr and the 03str are very simeler as far as these sensers go . So il bet it will work, eaven on the 03xkr !


Quote ,Avos
May have good news ;-).

I have tried my idea on a STR today, and the first results are very good. Am going to fine tune it more tomorrow to find the tresholds, lets hope this worksout.
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