Rover V8 engine management

[ajmac]

Any ideas on the following?

My Dad has been investigating a problem on his 99MY 4.0 litre Range Rover, the engine did run well, but at the moment it has a misfire at idle and will splutter and nearly die if you floor the throttle in the cold weather that we are having at the moment, just like an old SU carb set-up if you don't have the oil in the damper chamber. The diagnostic unit which he got over the net suggests that the ECU is detecting 'lean' mixtures on both banks, this would account for the symptoms, but what is the solution. It is one of the later Bosh management systems.

Alastair

[GreenV8S]

Might be a duff throttle pot (that could make it run extremely lean every time you open the throttle). But really you'd be better off doing a sanity check of all the sensor inputs to the ECU rather than guessing. If you're in a position to read the fault codes that is a very good plac to start.

[v8 racing]

could be worth checking the pipes from the airflow metre to the plenum chamber these would cause the same symptons?

[trackcar]

Indeedy Rob, weak on both banks suggests either air leak affecting both sides (global air leak in RV8 diags terms) which not only introduces extra air into teh mix but also reduces the air flowing through the air flow meter so a double wammy effect or low fuel pressure etc etc