Car starts instantly, thinks about idle at 1100 rpm, but then goes rapidly up to 4,280 rpm! When warm it tries to idle at 1,800 rpm, but goes into over-run fuel shut-off, so hunts between 500 and 1800 rpm. A genuine MM ISCV had been fitted, to no effect. What readings I could get, poor MAP, low lambda output, made me suspect a massive manifold air leak, but cannot find one. The manifold has been removed for inspection and replacement of the manifold to head 'o' rings, and no different. I have managed to get a perfect idle at 840 rpm by hand setting the ISCV, and plugging the old ISCV into the harness to keep the ecu happy. MAP 400mb and perfect lambda response. I have had no fault codes at any time, apart from self-induced ones. I now suspect an ecu problem. Does anyone know if this can be flash programmed out, or is it a replacement unit?
TIA,
Peter