cc260E

If you are refering to the vac hose attached to the FPR, I found it detached from the FPR end so even if the FPR was venting fuel, I doubt this is the cause.

On the other hand, I don't know if the FPR itself is OK.I suppose a faulty FPR would also cause the same symptoms such as running rich, etc.

A point I noted is that the car runs well when cold and rough when warm (slightly bumpy idle speed and oil pressure).

Looks like the same symptoms as before!

However this time, the fuel mileage crapped out overnight instead of over a longer period of time.

Disconnected the cold start valve - no diff.

Tested the engine coolant temp sensor to spec - abt 280 ohms at around 85 deg C.

I disconnected the EHA but it seems no different so I'm probably looking at a mechanical problem (FPR, Fuel Distr).

I took out my EHA wire harness and multimeter and attached it in series to the EHA.

Key ON, engine OFF, I noticed something strange.

The value was only 4ma instead of 10mA.Something definitely going on here.If I remember correctly, the OVP powers the CIS unit or EHA (I forgot).If this is true (I'll check the MB CD), I need to check the OVP.

But even if the OVP is the cause, that wouldn't explain why the car is unable to run mechanically well even with the EHA off (FOM).