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

Thanks Russell,

The stock ECU is no problem (I can clear it with my Autotap
software/hardware) and I have spare o2 sensors. My engine management is
actually via a Pectel T2. I usually crank 20+ psi at the track.

Sounds like I just need to watch out for the lead.

Again, Thanks

Phil Williamson
Oregon City, Or

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