1992 Jaguar XJS Repair Question
Asked on October 13, 2011
V12 runs too lean to pass emissions test
Always has trouble with NOX too high. Have tried multiple de-carbonizing additives in the fuel. Brand new O2 sensors, brand new complete exhaust system including cats, new spark plugs, fresh oil, new ignition coils. From what I have read this was the first year for the HE heads, designed to run more on the lean side to improve mileage and pass California emissions laws, since California is a big market for these cars. There must be some component or trick to make this car run a little richer.
Any info on this?
Thanks,
Tony
Any info on this?
Thanks,
Tony
Asked by tonytigerforyouAnswer
Replied on October 13, 2011
When NOX high indicates problem with EGR have that checked, cleaned ect
Replied on October 13, 2011
The car does not have an EGR valve
Replied on October 17, 2011
Who removed it? is car for USA production or imported?
Replied on October 17, 2011
The car is a USA car. It has a smog pump. Jaguar did not put an EGR valve on it.
Replied on October 17, 2011
Right XJ6 has EGR the XJS uses air pump and 4 cats. maybe air pump diverter valve faulty pump only adds air to exhaust under warmup if adds air when O2 are operating CATS will run hot causing NOx
