The Z has been running very rich since I put the cam in. I had it tuned by pcmforless. I was thinking my o2s were bad so i plugged in the laptop and logged a drive using TTS datamaster.
While the car is still in open loop, the BMLs are right at 128. When it goes into closed loop, the BML's and fuel trip cells start going nuts. They go way rich. Does this mean the car is only running rich in closed loop, or just that I don’t know its running rich until it hits closed loop? The BML's dropped below 100 at some points. This happened at all speeds and rpms. Also when in open loop the o2s bounce around a little, but when the car hits closed loop, they start bouncing up and down 100 times as much!

When I input the data from the short and long term fuel values (BML) and graph it against the charcoal canister purge duty cycle, the A/f ratio becomes considerably unstable when the canister is in the duty cycle. Are they related?

What the heck is going on? - Thanks

 

I know Brian At pcm for less is good and all but there is only so much you can do with a mail in tune. I would go ahead and get your car dyno tuned by a local tuner. I know what your going through right now. I just got done putting ina cam in my car and my blm's are a steady at open loop but as soon as the car goes into closed loop the blm's drop way below 128 to more like 100,99,104 and so on. Which basically is telling me the car is running rich. Your o2's are going to go crazy regardless when your in closed loop. But your split blm's need to be takin care of. I was never sure what the charcoal stuff ment on data master but I think it has to do with emissions