I hope all is well at the forum, 03 str,bank 1 and 2 lean,no vaccum leaks,new ngk iridium plugs,fresh supercharger rebuild,upgraded jaguar pullies,belts and tensioners,k-n air filter. I think it is over boosting,i dont know,they seem to think the same. Would too high concentration of coolent cause a problem, would putting a larger dia supercharger pully slow it down?.She runs perfect and strong,will cut out if i try to down shift the auto trans. Will run at interstate speed, would be greatfull for any help,thanks so much and keep all jaguar.

 

Any OBD tool with live data will let you see LTFTs at idle & 2500rpm (in P or N). What are they?

You do probably have an air leak. Ignore ideas you posted until better diagnosis.

 

Thank you jagv8 for the 411, last nite i took the air snorkle off ,where the accordian air tube is glued or melted to the hard plastic part of the assy., at that seem that joins the two together i found a stress fracture of the bond that joins the two,used a high intensity tac lite in the dark, have not repaired yet, will let all know if it solves same, have a good one.

 

thank you for info. i found hairline fracture where the intake air flex tube is bonded to the hard plastic assy. used high intinsity tac. lite in the dark, have not fixed yet, will let you know if it works. thanks

 

Great trouble shooting!

If possible could you post a picture? The plastic is getting old on all of our cars and you may be at the front end of a common problem.
.
.
.

 

Hopefully that's all it is and will be fixable. Let us know.