runs better with key off (1 Viewer)

[jkirk]

The engine runs better with the key off. I have to pull the oil pressure switch off to kill the motor.

chry 273 GM tbi conversion

The return fuel pressure is approx 5 psi, I haven't checked pressure on feed side yet. It runs very rich with key on. smooths out some and not loading up with key off. The O2 sensors are not installed yet.

Any Help would be great

 

[brokenparts]

the 02 sensor might be the most important part of the whole system... install it.

 

[venpick]

it will get better milage that way too.

 

[FLYINGLOW]

Your ignition switch could be worn out. If you have a wad of keys on your key chain the weight of it wrecks the switch. I think it was $35 10 years ago at toyota when I replaced mine but it was also available at the auto parts store too.