850 Turbo was running well. A couple mornings it started a touch roughly with a bit of gray/white smoke. Then the next afternoon, took a corner and it stopped running. Will crank, but not fire. Checked and changed the fuel filter, which was fairly dirty. Filter has refilled with fuel, so I guess the fuel pump is ok. Changed the spark plugs. Can't get it to turn over. Thoughts?

 

Will it crank or not? We call that a stall so you can use the last 20 stall threads as a guide. Is the timing belt broke?

 

it will crank but not fire/start.

 

Just because the fuel filter refilled doesn't necessarily mean you have adequate pressure at the fuel rail.. Really should ck it with a fuel pressure gauge. Fuel pump could be on its last legs or...