Webers & O2 Sensors

[ARCHINSTL]

Since the only post-Aisan ECU input is now from the O2 and water temp sensors (which latter apparently now only affects the phenolic heater *) - is the O2 sensor now redundant?
* Note that the temp sensor via the ECU may also still operate the vapor canister's VSV, which opens the purge line and is still hooked up as well, although I dunno if it is actually permitting a (atmosphere-vented) purge.
Every other emission switch is unplugged - and removed.
Any thoughts on the O2 sensor? It would now seem superfluous...
Tom M.

[Typrus]

I vote superfluous. And restrictive in an already small space

[takza]

I think the purge is controlled by engine rpm and temp. ECU should still see temp and rpm signals? O2 doesn't affect the purge?

[splatterdog]

You could always use the o2 for an air/fuel gauge.

Purge also uses a vacuum switch(that you most likely removed), that lets the ecm know there is manifold vacuum present. I believe the FSM covers theory and operation. I still haven't messed with mine....

[takza]

That vac switch is controlled by the ECU using rpm and temp signals? Should still work if the basic wires are hooked up? ECU would default to a basic fuel map?

[gearhead313]

I've also wondered about this. I noticed mine was chopped in half and wondered a: if there was an ecu that ran the car and b: what does it really control? I think im going to start planning a complete emissions removal soon and see how it goes. The only thing i was worried about is if there was any ignition adjustment via the o2 input. If not, then let the games begin!

[takza]

I tried removing all the vac tubing with the OEM carb...wouldn't run right.

[Typrus]

It will run better with everything hooked up, provided everything works. Get a MityVac and test all the diaphragms. Even the secondary if you can find a way. I think I saw NAPA listing them now, so if its damaged, it could be done. Test dist advance, HAVC, all that. If it is all in tact, keep it hooke dup properly.
I think the only reason my bypassing worked was because my dizzy advance was blown without me knowing.