[sszablya]

My 550ix N63 is running exhaust gas temperatures that seem unbalanced to me. I'm wondering what normal EGT is for this vehicle? Here's my ballpark temps, under moderate load:

Catalytic converter bank 1 temp: 700-800°F
Catalytic converter bank 2 temp: 1050-1300°F

I just replaced the plugs, which were all toast. Subsequently, I'm wondering if there is a fuel injector leak in Bank 2, or if the catalyst has failed. 120,900mi. Occasional smell from exhaust, may indicate a rich condition.

Don't have long term fuel trims just yet; but I'll pull them tomorrow and post.