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Originally Posted by LGAFF
Going lean because of the 02?
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Maybe so. I had one that until I began recording data with a datalogger (diacom) I had no clue. It was "lazy". In your case it could be that the heating element is not getting up to temp before close loop is entered. Then eventually get there with exhaust temps.
[QUOTE=LGAFF;181550]A fuel injector is not going to get better, neither is a pump....unless its a relay...primary replaced...I would think if the engine transitions from the secondary to primary the issue would be the primary relay or pump
Pumps can and do fail intermittently. Since your symptoms are so repeatable probably not but....
Quote:
Originally Posted by LGAFF
if it were the pump....it would not go away
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It can in fact go away but not as a function of engine temp.
Quote:
Originally Posted by LGAFF
the issue lasts 30 seconds then gone
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Job for a datalogger and then time to study what happening as the close loop bit is set (close loop entered), focusing on which side maybe going lean. Does this symptom happen in full eng power and not? But anyway.... time for a data capture for the full warm up period.