Thread: Talk about your all-time bonehead moves

Ive never ran a o2 sensor in any of my turbo cars.

You must not have emissions then, or your cars are off-road?

When I did turbos I had no emmissions testing. However a bad O2 sensor will not cause a car to run horribly.

a bad or no o2 sensor will fuck with afr's a bit, i know this for a fact.

Once at operating temps the ecu goes into open loop and operates the engine on the ecm values.
O2 sensors are used to maintain stoich conditions until at full temp which helps with fuel economy. It will not cripple an engine.

But on OBD2 it will throw a check engine light

it will not cripple an engine no, other then that i disagree. i've experimented enough times over the years with nistune on both of my cars to know what it does an does not do.

I've seen a bad sensor cause an over rich condition on idle (low 13's instead of mid 14's AFR) and I've seen that no sensor will go the other direction (low 15's to mid 15's AFR) this is with nistune where i was able to turn it off in the ecu as well as just unplugging it with an without it ticked off in the ecu.

Realize that when in open loop those afr's are determined by the values in your ecu, I'm not referring to an aftermarket ecu with unknown parameters. On a car where the maf/injectors have not been modified unplugging the O2 will not affect the drivability at all since the engine won't be reading input from the 02 once in open loop

Idle is considered closed loop and mainly for emmissions.

dude what the fuck are you talking about???????????

our ecu's have a closed loop section, where the value's are in the 190's an such an there for it uses o2 sensor feedback.

you've only been here since november maybe you shouldn't be posting such bold statements

See my edit...idle and constant speed sections are closed loop. WOT or partial are open. This is basic facts.

Lol at you equaling join date to experience. I've been a member of various car forums since 2001.