New equipment in the market now which is much improved we have a number of centres running the bosch bea 950 analysers.
They plug into obd and everything is bar graphs on the screen so reads oil temp , engine revs etc through obd and wont let test proceed unless oil temp correct and during test ( petrol) revs must be kept between the graph lines or countdown timer resets.
On diesel same oil temp check then governer check ( this machine will make you rev the diesel to its set govener before allowing test commencement)
Then on print it will show for each rev
The oil temp , idle speed , max rev at limiter also how long it took to take rev to limiter and how long held .
When you rev it the revs show red on screen got to keep going till goes green .
As for the readings above without knowing the oil temperature difficult to make a proper judgement.
But lambda is low ( ideal is around 1.01 ) low is rich high is lean.
With reading as high as that at idle it would smell rich a good running 2.8 single or twin vanos should be good just mot'd a 2.8 single vanos with 120k emissions were spot on .
The tu 2.8 is a euro 3 engine so has 2 cats ( cyl 1 to 3 and 4 to 6 ) with 4 lambda 2 pre and 2 post cat then a y piece to merge to one and at rear a valved back box these are usually spot on for emissions
Do you have a code reader if so check for faults.
If nothing then may just be needing to get everything back to proper operating temperature to clean it out.
Stephen.
