unplugging an o2 sensorr, Defaultt lean ?

[Mclovin]

does the ECU go to lean default when o2 is unplugged ? or is default rich ?
Its an 88 chevy TBI 350 truck motor

[MuddyPaws]

It goes to a default set of parameters. Now if it is cold and tha air is dense, then it will ne a bit on the lean side. If it is hot and the air is thinner then it will be running a bit rich. It will not adjust for temp, pressure, or load changes. So there is no real answer to your question.

[Mclovin]

Hmmm ok.. got any ideas on how to make the computr lean it out more..
on a side note: i have the Holley TBI unit and i know they're headaches but with my heads i need the extra CFM.. just not all the fuel.. I know this makes no sense

[auburn6887]

did you plug the holley into the oem wiring to the oem computer? if so just get a new tbi chip for your motor.ebay $15 i think it was tbichip. i told him what i did. on the tps sensor you should read .500 volts at idle. you can oblong the holes to make the tps read it is open farther and you will run richer.

[Mclovin]

Originally Posted by auburn6887

did you plug the holley into the oem wiring to the oem computer? if so just get a new tbi chip for your motor.ebay $15 i think it was tbichip. i told him what i did. on the tps sensor you should read .500 volts at idle. you can oblong the holes to make the tps read it is open farther and you will run richer.

I need to lean it out not dump more fuel in.. Im gona try and find a stock TBI unit to put on and see if that helps...