Hi All,
Unfortunately I am not the first to get under the bonnet of this!
Codes present:-
P0553 Power steering pressure sensor
P1477 Variable intake butterfly valve elctrical fault
P1472 Variable intake butterfly valve always open
P0172 Fuelling bank 1 (odd bank) rich limit.
When cleared P0553 and P1477 returned. After a roadtest the P0172 is recorded as a pending code.
At idle:LTFT B1 is-19.5% and B2 is 4.7%
Over 2000 rpm B1 is -10.2% and B2 is -0.8.
At idle Bank 1 is pretty consistent at around -20% and at any speed over 2000rpm is -10%. So I can see why the P0172 is set.
The vehicle has recently had the manifolds off for coolant leak repairs. I have not been able to exactly determine from the customer if the MIL was on before this or not. The Garage before me have fitted 2 new lambda sensors, one was supplied by them and the other by the customer, which was a fuelparts item. Personally I would have gone genuine (or as close as I could). Both sensors are switching although I have not scoped them yet.
Checking archives I know the variable intake valves are a problem but unless one is breaking up I don't think it will cause fuel trim problems. I can see a connector for the Power steering pressure sensor on the loom but nothing on the pump, I am think maybe not fitted on this version.
The problem seems additive in that it diminishes with increasing speed. I am think possibly leaking injector. If it was EVAP problems then surely it would affect both banks?
Shaun.