850 Engine Cutting Out

Fuel Pump relay?

Hi, possibly one of the commonest causes for this sort of behaviour is the fuel pump relay (103 under Fuse box cover). This can give a variety of symptoms, most not logging any fault code, but it is a simple and cheap item to try first. Also have a look at the throttle body, after a fair few miles without cleaning it can get a build-up of oil residue and cause poor idling. Next on the list would possibly be the cam position sensor, but this should log fault codes if it fails. Then we get into areas such as engine temp sensor (faulty readings from this will give incorrect fuelling and engine cut), bad earth on coil pack (another known area of running problems), Tired Idle Control Valve, plugs, leads, rotor arm, dizzy cap. As the car starts again after cooling slightly, it would seem to indicate a heat soak related problem, so I would look at 1. Fuel relay 2. Engine temp sensor 3. Cam sensor. Hope this gives you something to go on.

Beat me to it Chris!!

Let us not forget stuartvolvos epic log with his similar symptoms of not starting when hot. It looks like he had an intermittent connection at his immobiliser. I miss his log. The forum will not be the same again when it goes.

Chaps - Thanks for the prompt replies and details; will definitely get these 3-4items checked and will let you know how I get on.

LOL, Thanks Brian, i didnt think that you enjoyed my posts that much! We will have to get a volvo meet around about Motherwell / Glasgow / Kilmacolm somewhere. Cheers Stuart

Problemo Resolved