940 SE Turbo won't start. Seems to be linked to damp weather conditions. but is so intermittent it is impossible to be sure. Fuel pump relay replaced.

Try changing the distributor cap and if that doesnt work then the coil in case the coil tower insulation is breaking down

Get a spark plug tester.check for spark from the coil first.if ok move to your leads fit a spare plug earth it check each lead for a spark.if ok take out one spark plug at a time smell it do you smell fuel.if yes .move on to check your plugs does it have a good spark if no change the plugs.