ok, so i have an 89 na, and i am pretty sure that my 4 wire O2 sensor is bad.
anyways, when the engine is cold and i drive it, the engine stumbles under 4000 rpms, unless i push the gas pedal farther than 2/3 down. after 4k rpms or almost WOT, it runs fine.
now my question is, what exactly does the ECU do to make the car run this way, i mean, if i am just cruising around town, say.... 3rd gear doing 30mph, and i slowly roll on the gas, the car doesnt accelerate, it just starts stumbling. why?
does it run lean when this happens, or rich? or does it just retard the timing? i am looking for a somewhat detailed explanation of why a bad O2 sensor makes this my engine fall on its face? and why it accelerates normally under WOT or over 4k rpms.
any help is appreciated
anyways, when the engine is cold and i drive it, the engine stumbles under 4000 rpms, unless i push the gas pedal farther than 2/3 down. after 4k rpms or almost WOT, it runs fine.
now my question is, what exactly does the ECU do to make the car run this way, i mean, if i am just cruising around town, say.... 3rd gear doing 30mph, and i slowly roll on the gas, the car doesnt accelerate, it just starts stumbling. why?
does it run lean when this happens, or rich? or does it just retard the timing? i am looking for a somewhat detailed explanation of why a bad O2 sensor makes this my engine fall on its face? and why it accelerates normally under WOT or over 4k rpms.
any help is appreciated