Folks,

The 3-second "click-clunk" under the passenger seat returned for around 40 miles this morning, at all speeds up to motorway, and even when stationary with the engine off.

I take it that this is the electrovalve. It sounds uncannily like the electric fuel pump on my dad's old Morris Minor Traveller. There was a distinct current "pull" when it cycled, as the cabin lights dimmed very slightly, and the alternator came under load, changing the engine tickover note.

After a time parked, and a restart, the noise has disappeared.

Of course, I guess that this may be a sign of a duff sensor, and I'll need the ECU read, but has anyone experienced this before, and what caused it?

Rg

XM 2.5

Hi there, i have a 93 Xm which was doing a similar thing a few months ago, just driving around town, even with the ignition on (engine not running) the valve was switching on and off and i think with the pressure in the system it tends to resonate through the pipes.
Like yours it cured itself before i had a chance to search around and find out what was going on.