EFI and leaded gas

[David Doddek]

One thing to remember about lead in gas, is that it sticks to everything.
Remember in the old days the white build up on the spark plugs that would
foul them up in a hurry.  Ever wonder why plugs will last 50K miles any
more.  Well guess what, the same thing will happen to an O2 sensor.  That
film of lead on the sensor will seal out any gasses like siran wrap on
leftovers.  And there is no way of burning it off.  One more thing to keep
in mind, antifreeze and certian types of silicone rubber will also ruin a O2
sensor.  So if you blow a head gasket then likely the O2 sensor will need
changing.  Also make sure that any selants used on an engine, ie intake, are
marked O2 sensor safe.  Electrically be sure to never apply any type of
voltage to an O2 sensor, and that includes trying to measure the resistance,
the element is very sensitive.  By the way I have heard of unleaded racing
gas but dont ask where it can be found.

Hope that the info is of some help.

David J. Doddek                                          |pantera at dris.com
Owner SGD Electronics & Development Engr for Caterpillar |h 309 685-7965
Formula SAE Team Sidewinder 94-95                        |w 309 578-2931
89 T-bird SC,  69 Fairlane w/SGD EFI                     |fx 217 428-4686
74 Pantera w/Electromitive Tec-II Twin turbos and Nitros |
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