Uneven running

4.6 running rough on petrol but ok on gas have reset adaptions and o2 sensors appear to be working running between 0.9 to 0.01 maf is showing when up to temp 23/24 kgs also no faults showing having said that gems doesnt give out that much info so I am thinking either o2 not switching fast enough or petrol injector also really difficult to start on either petrol or gas when hot prob more difficult on gas which is why I think maybe o2 sensors not trimming properly any thoughts guys

Sandy

I still have my 1995 gems vehicle if it would help to use as a comparison.
Let me know & I will bring it over.

Eric

My first thoughts are airflow seems high - would expect 20 - 22 at idle and if we are talking gems then your O2 readings should be reading 1 -5 v

rewmer said:

My first thoughts are airflow seems high - would expect 20 - 22 at idle and if we are talking gems then your O2 readings should be reading 1 -5 v

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Depends if he's using diagnostics to look at it I think. Using Lynx mine shows a range of 0-1 even though I'm using the 5v GEMS type o2 sensors. I think we established on the other thread that Nanocom was the same.

Obviously if you've changed them yourself check they are the correct type.