Quote:
Originally Posted by gbrtng
The audible pinging is a clue - it's running lean with advanced timing. Maybe a failing injector or knock sensor.
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I agree w/ gbrtng that the pinging is the clue that it is running lean, and or the spark is too advanced(?), especially if it is pinging on 91 octane. Marc H can provide you with a chip that will bring the fans on while the temps are a little cooler. Cooler would help N0x, but too cool and HC will creep up - it is a balancing act. 10º cooler (both fans coming on at around 206-210) might do it for ya.
Anywayz...I would do a dynamic scan/data logging to see what other clues might pop up before I started changing this and that in hopes the problem goes away. BTDT.
P.