I am struggling to find a direction to go on this one. The car will occasionally cut out completely under hard acceleration. The glow plug light comes on & it shuts down totally. The fault code is P0234 & here is the snapshot from IDS....



I have managed to re create the fault in the workshop with the scope connected, although it doesn't seem to suggest an overboost condition. From cold it will rev perfectly, but when its hot, it will start to misfire at maximum revs & randomly cut out again.

Here are the captures (details in the notes at the bottom)






Looking at the captures, it appears that the rail pressure goes a little erratic as the misfire occurs. The inlet metering valve can be seen to shut the fuel off moments after a peak in fuel pressure.

The DTC seems to point toward an overboost situation, but the captures seem to show that the boost pressure remains constant as the fault is logged. I have heard about problems with the intake flap causing similar problems, but this car hasn't got one.

Any experiences anyone?

Cheers for now.

Dave