we have gained this veicle from another garage, it has no fault codes listed in obd, and WHEN I can gain access to MPI 1.1, it sometimes throws me out and refuses to re-connect.

The fuel trims are reading LT -4.7% and short term 25%????

Its had a lambda sensor as its nice and shiney, and also been told the throttle body was replaced/reman.

I have no test data for this vehicle anywhere, and am unsure if the rac/other garage cleared any codes?

When accessing MPI 1.1 The coolent temp and IAT Sensor are reading backwards, starting at IAT -130 ish coming down to 51? and coolent temp comes down to 25.

I have scoped the lambda and its switching not saying its rich or lean perminatly.

Just looking for a point in the right direction. Main dealers want to just throw parts on it, which i'm not prepared to do.

Thanks

Dean