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Old 11-02-2012, 11:19 AM   #12
big-t
Gnarly Adventurer
 
Joined: Oct 2004
Location: left corner of VA
Oddometer: 478
Quote:
That is very helpful and it does look like your O2 values are much more even. Mine are crazy because they'll just drop all of a sudden to almost 0 and then fluctuate a bit, then come back to the 0.7-0.8V range, then drop again, and the injector pulse doesn't really seem to move in lockstep with the O2 value. I really don't have any clue how to diagnose this other than fiddling with vacuum hoses at this point. I suppose I could switch the 2 O2 sensors and see if that makes a difference, but ugh I think I'd have to take the whole exhaust back off...
I wouldn't put a lot of faith in the o2 readings Tuneecu is showing because they operate much faster than it shows on the screen.Most diagnostic software just averages out the readings,so your not seeing a true picture of the o2 operation.You have to use a o-scope to get that.They can switch at up to 5 or 6 times a second depending on conditions.

How about disabling the o2 s with Tuneecu and see if that evens out the injector pulse ?

If it does I would bet on an air leak,maybe the SAS leaking air into the exhaust..at one of the cylinders.. or possible a dirty injector not atomizing the spray well enough for a good burn
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