Strange problem with idle and O2’s and knock

[86BGN]

After driving for a while and then coming to a stop my O2’s show 820’s. BLM’s seem normal at 130-134, TPS is set at .44 with the car off and .46 with the car running and the IAC in park is 28-30 depending on the fan. If I let the car sit and idle the O2’s slowly go lower and lower. I have watched them over a 15 minute period of time go from 820’s to 590’s. Just seems strange. The car used to set in the low 800’s and stay there at idle. It is a open loop idle chip. The car is idling pretty ruff and seems to run ruff to. One other strange tid bit is, after the O2’s have started doing this if I idle the car up a little bit using the pedal the O2’s will go to 000 and might stay there for 4-5 seconds…. Strange

PART 2

I had my alky chip installed, with no alky (long story), anyway I haven’t been pushing it at all because of that, just cursing lately. Well tonight I switched back to my street chip so I could at least run it through its paces to see if I had any other problems. I still have the same weird O2 readings. Also the boost is set around 15 PSI and I am getting crazy knock starting from say 7-10 PSI at any amount of throttle?

I don’t seem to find any vacuum leaks and BLM’s are where they should be any way. I checked the check valves, I checked the resistance on the coil pack and they all were in the 13’s, the wires where ok, I have put new plugs in recently, the MAF reads ok and the fuel pressure is set to 42 PSI with the vacuum line off.

Any suggestions?

 

[83ttypecooled]

Hi,
Forget the idle, let's talk about the KNOCK problem you have. I just pulled a head on my car, massive piston damage that I'm going to have to fix ,due to detonation! I ran into a situation where I got stupid, stomped it, and paid the price, in spades! In my case, low fuel pressure killed me, what is your trouble?
I would suggest going though all the safety net procedures regarding detonation, including looking at piston hotspots. ANY damage to a combustion chamber piece will create a hotspot that could be the end of your motor.Also, lean mixtures,too much spark,and ANY amount of undue oil consumption(PCV?) can create problems. Good luck!