Slight sputter on start up

[lincoln_zero]

Replaced all 8 coils about 8 months ago.
Last week noticed a misfire. Code came up bank 2 cyl 6. Replaced all 8 sparks and the one coil from bank 6.
Now on start up, I notice sputtering or what seems like ever so slight misfire. After 30 seconds of warm up, seems fine. CEL came on, 02 sensor bank 2. (A repeated problem, yes I will change it)

So question: Can a bad 02 sensor/clogged cat give symptoms of misfire?
If not, I'm just gonna go ahead and order 8 new coils and replace.

I am going to replace that 02 sensor. My car was scheduled this weak but my mechanic had an emergency trip to the hospital night before so LS work has been rescheduled.

 

[joegr]

Are these OEM coils?
When you replace the coils, you have to replace the spark plugs (even if they are only a week old), or you are wasting you money. Bad coils damage spark plugs, damaged spark plugs damage coils, repeat over and over... Check and adjust if needed the gaps to exactly 1.0mm

It's far more likely that your O2 sensor is telling you that you have one or more bad coils, than the O2 sensor actually being bad. Don't shoot the messenger. That said, yes a bad O2 could cause misfires, and a clogged cat can cause many problems.

Hope your mechanic is okay.

 

[lincoln_zero]

Are these OEM coils?
When you replace the coils, you have to replace the spark plugs (even if they are only a week old), or you are wasting you money. Bad coils damage spark plugs, damaged spark plugs damage coils, repeat over and over... Check and adjust if needed the gaps to exactly 1.0mm

It's far more likely that your O2 sensor is telling you that you have one or more bad coils, than the O2 sensor actually being bad. Don't shoot the messenger. That said, yes a bad O2 could cause misfires, and a clogged cat can cause many problems.

Hope your mechanic is okay.

Thanks Joe!

I legit think the 02 is bad. When I replaced the coils 8 months ago, i had no sputters or misfires, but CEL came back intermittent with 02 sensor. 02 sensor would pick up on the bad burn or fuel dump into CAT right? So for it to come on again without misfires, means the sensor or CAT is done, from the sounds of it.

That said, I did replace the Bank 2 Coil before putting in the new plugs, I guess its possible other coils are misbehaving and just didn't throw a code like that one coil did.