Bad O2 sensor= ECU safe mode?

[kscElite]

Will having a bad 02 sensor make the ECU set the air/fuel mixture richer?
If yes, could this be why my B18B is lagging a bit and missfiering?
Note: Spark plus, distributor cap, and plus wires have been replaced new.

[kscElite]

Anyone?

[shaolin_style]

Yes a bad primary 02 sensor will give you an engine light and a richer mix BUT..this wont make you misfire. You 90% likely need a new distributor. I've seen this alot and its usually bad/old distributor. You can find referbished ones for good prices on EBAY. I had the same hesitating/misfiring problem with my gsr motor and distributor fixed it.

[HondatechAV6]

a distributor is either working or it's not working. the parts inside the distributor are just sensors. if a sensor goes bad, the ecm will set a code for the sensor that has a problem. if the icm goes bad, the engine will not run. if the ign. coil goes bad, will not run or will not run properly loaded(rare). (i'm talking about stock engines)

i'd start with reasons why the engine would misfire or get bogged down, such as:

stuck open egr
too tight valves
incorrect spark plugs or incorrect gap
partially clogged injectors/bad fuel

[shaolin_style]

Originally Posted by HondatechAV6

a distributor is either working or it's not working. the parts inside the distributor are just sensors. if a sensor goes bad, the ecm will set a code for the sensor that has a problem. if the icm goes bad, the engine will not run. if the ign. coil goes bad, will not run or will not run properly loaded(rare). (i'm talking about stock engines)

i'd start with reasons why the engine would misfire or get bogged down, such as:

stuck open egr
too tight valves
incorrect spark plugs or incorrect gap
partially clogged injectors/bad fuel

WRONG. Listen to what i said man.

[HondatechAV6]

Originally Posted by shaolin_style

WRONG. Listen to what i said man.

of course a bad o2 sensor would cause rich/lean problems, but i'd still stick with what i said. the computer will just set the fuel from what it sees the o2 sensor signal. it won't cause the misfire like you said. therefore, the next step is to start with things that CAN cause the problem. you can't just say replace the distributor without testing it, it's a $300 part (oe)

for instance, a stuck open egr can cause the o2 sensor to 'act bad' when it's really good.


the icm(inside the distributor) and the ign. coil(inside the distributor) ARE replacable, so replacing the distributor with a new one with these parts may fix it, but so will replacing the one bad part, if it is one of these two parts.