A few days ago my Rover 25 turbo diesel ie model developed a classic diesel knock, like a transit van going up a steep hill. It's a 2001 model with the Rover L series 2 litre lump. It's diagnosis has proved elusive so far, so I'd like to ask the learned and experienced here for help. Actions so far...
1. Removed and checked EGR valve, no sign of excessive sooting, and the vacuum capsule is intact.
2. Ran with EGR suction pipe OFF - no change
3. Ran with EGR pipe direct to the vacuum source - no change.
4. Disconnected the MAF sensor, reconnected the MAF sensor - no change!
5. Checked the coil resistance in no.1 injector (but not the continuity back to the ECU yet) - no change whether connected to the loom or not.
The symptoms are:-
Loss of power
Excessive clattering at low engine speeds and throttle, seeming to quieten down above 2000 rpm and wider throttle openings...this is not conclusive as I'm not taking it over 2500 rpm as a precaution.
Higher fuel consumption, in the order of 20% thirstier.
Very occasionally, and without pattern, it has suddenly gone quiet, and much more power has become available...but this won't last longer than a couple of seconds.
I look forward to any useful ideas, and to being able to drive without the ear defenders. It has been suggested that a coil in the fuel pump has failed, and the very early injection of the fuel is causing the loud knocking noise? I have no experience of this, but welcome suggestions for testing it before splashing out several hundred pounds for a new one
Any ideas? I have a multimeter and hand tools for testing.
MM
1. Removed and checked EGR valve, no sign of excessive sooting, and the vacuum capsule is intact.
2. Ran with EGR suction pipe OFF - no change
3. Ran with EGR pipe direct to the vacuum source - no change.
4. Disconnected the MAF sensor, reconnected the MAF sensor - no change!
5. Checked the coil resistance in no.1 injector (but not the continuity back to the ECU yet) - no change whether connected to the loom or not.
The symptoms are:-
Loss of power
Excessive clattering at low engine speeds and throttle, seeming to quieten down above 2000 rpm and wider throttle openings...this is not conclusive as I'm not taking it over 2500 rpm as a precaution.
Higher fuel consumption, in the order of 20% thirstier.
Very occasionally, and without pattern, it has suddenly gone quiet, and much more power has become available...but this won't last longer than a couple of seconds.
I look forward to any useful ideas, and to being able to drive without the ear defenders. It has been suggested that a coil in the fuel pump has failed, and the very early injection of the fuel is causing the loud knocking noise? I have no experience of this, but welcome suggestions for testing it before splashing out several hundred pounds for a new one
Any ideas? I have a multimeter and hand tools for testing.
MM