Right need some diagnosing a fault on me mates shell suit wearing cavalier (Calibra ) Its a 2.0l 8 valve CAT equipped.

starts not too bad from cold but smells really rich, then a horrible noise starts coming from the fuel pump like its sucking in air and speeding up and slowing down Once warm ish the pump sounds ok for a short period then all of a sudden it will start to howl and the revs go really lumpy and eventually stalls

Tried a different fuel pump with its own dedicated 12v feed, still makes the same noises and symptoms as the old pump, getting plenty of flow and pressure through the pump, reg on fuel rail appears to be working and when vacume pipe kinked you can hear the revs change slightly. There is no pressure drop in the fuel system, nor any leaking injectors.

When it stalls if you leave it five mins or so it will start up, but if you leave the pump running (own dedicated power supply) with the engine off and then try to restart it wont do it, to me suggesting a leaking injector fouling plug(s).

Also had another known working ISCV fitted.

Going to try and swop various sensors and ECU tomorrow

Any help much appreciated

Bri.