Dear all,

I need some advice. Car is a 2006 XJR. Yesterday I got my catalytic converters replaced, as the left one was totally melt, and the car was running like in limp mode. The guy who did the replacement said that there my idle is a bit rough, and he is sure that it killed my cats.

There is no other code than P0441. I have checked for leaks and vacuum problems with little shots of brake cleaner, nothing happened (at least by ear, I did not check the numbers during the procedure). My LTFT is high, around 10 constantly on bank 2, while it goes back to around 7 on bank 1. the STFT is around -3 both banks. So I think there must be somthing with the left bank. Can it be connected with the EVAP system error? If so, how could I easily test the evap valve? If I know it well, it only acts in certain driving conditions, and should not affect idle, but who knows.

Any other ideas?

Thanks in advance

Barna

 

It might still be relearning since the blockage cleared, so the 10 may come down.

You could perhaps risk clearing the fuel trims (disconnect battery) but it will also clear all the OBD monitors and:
1. many places they need to be set for smog checks
2. if there's a fault it can block monitors and they in turn may be unable to flag codes (Catch-22) - and diagnosis becomes very tough