extreme lean condition at high boost.

[Chris Thorp]

On Oct 24, 2006, at 3:43 PM, John Cody Forbes wrote:

>
>
> Don't forget that a missfire shows up as a lean condition to an O2  
> sensor
> due to the excess of un-burned oxygen. If you have a bad spark plug  
> that
> can't deliver spark at extra high pressure levels that hole  would  
> go dead
> under load and pump a ton of raw oxygen into the exhaust, tricking the
> sensor into thinking you are lean.
Which has the obnoxious potential to then cause other cylinders to  
rich misfire due to the computer's over delivery of fuel to  
"compensate" for the supposed-lean condition.

-Chris