O2 sensor

[STOCK94]

I've had an O2 sensor check engine light for a little time now, Tuner at the dyno tune told me because the guy who initialy installed the long tube headers cheaped out and just cut and lengthened the wires instead of plug in extenders, no big deal the car runs good will fix later I said. After a few hundred miles the car has begun to miss under heavy acceleration but only when it is warm,under normal driving conditions it runs fine, have cleared check engine light just for the same code to reappear multiple times. The car is supercharged so I don't want to run it hard while it misses, afraid of fuel mixture problems. Unsure if I'm not letting the ECU have time to diagnose or recognise the problem or not. Question is, could the O2 sensor have finnaly given up and be causing the miss? Gonna replace it and add plug in extenders in a couple of weeks. Any ideas of next step if that doesn't fix the problem?

 

[STOCK94]

Yeah, I know I'm not a 94 but upgraded since last time I was here and didn't know how to change name. So I will remain screwed up for now.

 

[SpartaPerformance]

What most likely happened is you've fouled your plugs from running with the CEL on. With the CEL your sensors are turned off so you're running on a pre programmed et of parameters for original equipment. Those CEL programs run rich to begin with add the fact of your bigger injectors for the SC you're fuel soaking everything.

 

[STOCK94]

K thanks for the direction, will check them on my off days.

 

[STOCK94]

Thanks for the direction SpartaPerformance, needed to change o2 sensors anyway and did but as you pointed to the spark plugs I pulled them, the first one I checked was the second one back on the drivers side because of ease of access. Dang thing was loose and when I got it out it rattled in my hand, took a closer look and the electrode it looked fine except you could twist the end that the coil pack connects to all the way to the electrode. Must have been a bad plug from factory, checked all the rest they looked fine. Replaced that one plug and the o2 sensors and added the extenders and no more miss. Thanks again for the direction.