[Ricketts]

A quick question - I had an erratic FE reading on my scangauge in my Saturn yesterday (I usually see 5.8ish litres per 100km's, but I suddenly had 9.9 litres per 100km's - today was back to normal, not sure why it showed so bad yesterday, the car ran exactly the same as always). Maybe the SG lost its marbles for a day. But I digress.

So I had changed the parameters I was monitoring on the SG to see if something was amiss that may have caused my FE reading change. I monitored Intake Air Temp, Cooloant Temp, Litres per 100 km's and Open/Closed Loop operation. I noticed whenever the injectors shut off, that the car slipped into open loop for the duration the injectors were off. It went Closed loop as soon as I pressed the throttle again.

Does this make sense? I guess the ECU goes open loop because since there is no fuel flow, checking for a rich/lean condition is a moot point. Maybe it would throw a code if it didn't go open loop. Please forgive my ignorance on the subject, just trying to make sense of it all.

Thanks

Rick