Re: Volvo 850 2.5 power loss mystery
"john morriss" <email@example.com> wrote in message
> Further details are limited, I'm afraid. There were no strange noises, no
> warning lamps and the tacho reflected the revs correctly. The engine
> misfire or stutter, it was just that for 15 seconds or so it was as if I
> switched off the ignition (which I hadn't). I had refueled (with BP) 10
> hours earlier in the day, but had only driven 3 miles since filling up.
> previous day had been one of torrential rain, with puddles that I had
> through without problems, and this day had been dry, and windy.
Well your symptoms rule out both a faulty ignition barrel (common) and ECU
power failure, and LT ignition switching- becuase the tacho remained
indicating correct engine revs, but you were just coasting.
Therefore that does leave fuel pump and relay, and secondary igintion (this
includes the amp, and coil). Both would be able to kill the engine dead
wihtout any spluttering or partial power loss.
I'd check the connections at the coil pack, and the fuel pump fuse, and
possibly get your hands on a new fuel pump relay (underneath the fuse box
lid- 2 screws to remove) just incase it does it again.
If you are handy with a soldering iron, you can open up your exisiting relay
and resolder all the joints instead.