Dick Savold wrote:

Sorry about this side-ways step but I'm in need of wisdom. I have a
turbocharged Ford Focus. I'd like to crank up the boost for the weekend
drags we have. Do you see any issue with running 100 LL (I can remove and
replace my cat very easy).

Russell Kent wrote:

Lead will poison the O2 sensor.  Running awhile on unleaded will most times
detoxify it, but there's never any guarantees.  A bad O2 sensor will cause
the ECU to bugger up the mixture at idle and part throttle (O2 input is
usually ignored at full throttle operation).

You might want to remove the O2 sensor when running 100LL.  The ECU will
report it as a failed O2 sensor and illuminate the "Check engine" idiot
lamp.  The next visit to the dealer shop or the state inspection station
might involve explaining why you don't really neeed a new O2 sensor (since
the ECU log will rat you out).

Russell Kent

 
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