so i keep getting a CEL for my o2 sensor on my obd1 ls motor (91), and ive noticed my car is runnign like shit. response is poor, power still seems good its just that its doesnt respond very well. a few questions..

would a bad 02 sensor cause this poor performance (i recently did a full tuneup so its none of that)? when the CEL comes on for it does it put my car into limp mode or somethign like that...?

do those o2simulators affect the performance of the car? do they just get rid of the CEL or do they really pretend like the o2 sensor is detecting the correct amount of air..or whatever it does?

i heard somethign about a resistor and a capacitator to trick it into thinking the o2 sensor is ok...anyone know what this is?

o and my gas mileage sucks ass right now too.

 

O2 sensors don't affect the performance of the engine that greatly. But you're saying you got a cel from your O2 sensor? Does it just stay on or like turn off sometimes?

 

sounds like you are running very rich...check your exhaust tip as it is most likely scored black

 

would running rich cause a check engine light? im jw if it the light comes on, that means my sensor is bad correct? if i change it and im running rich will it just trigger the CEL again???

 

well, first of all, a 91 ls motor is obd0. just thought i'd let you know, unless you converted motor and car to obd1 for fun...

 

yes i knwo its obd0, but im wondering what to do. my car sort of hesistates too, most noticably when the CEL comes on, the power just drops significantly. o2 sensor??

 

OK... just to be sure... when your CEL comes on, you are getting a single blink (1) out of the LED on the ECU?

 

yes one blinking light, i always pull the hazard fuse to clear it but i eventually will come on, sometimes after 3 hours of driving, sometimes after 20 minutes..=\

 

just replaced my O2 sensor last saturday. i could clear the code, but if i accelerated hard it would come back on. gas mileage and performance sucked bigtime. just went to local autoparts store laid down 30 bones, then found i needed a 22 mm offset box wrench, 10 bones at tool outlet for a full set. pulled battery cable( to reset ecu) then switched sensors was done in 20 min.good as new.

 

Step 1: replace O2 sensor.
Step 2: if the problem persists, come back and ask for help.

Right now, the car is just asking for a new O2 sensor. Give it one.