Thanks Todd - I did pull the AFM screw and the o-ring is there and seems still supple enough to seal off air getting past the screw. I do not have the hose from the oil tank back to the 90 degree big rubber fitting, that is blocked off. Right now I just have a small filter installed on the oil tank fitting venting it into the engine compartment.
I do plan to take some more measurements from the O2 sensor with a few different settings on the AFM screw when I have time. I will also do some more checking for possible vacuum leaks as that could definitely explain the behavior. Wouldn't the 0.26V measurements with the engine warm indicate that it's running on the lean side at idle?
Quote:
Originally Posted by tholyoak
If the AFM screw isn't doing anything, I would suggest that you may have an intake system leak or that the o-ring on the screw is missing/not sealing. Although it seems you don't have a good way to test that it really isn't doing anything. As suggested, you can just look at the narrow band O2 sensor voltage and see if the screw is really doing anything or not.
Is the hose that runs from the rubber throttle body to AFM hose to the oil tank installed? Is the restrictor (brass cone looking thing) installed in that oil line?
-Todd
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