855 T5 starting issues

[Callyuk]

Well here goes went down to work to get my car home after it had been sat there for a week with a dead fuel pump. (Fitted new second hand one and was up and running last night) but as i was on my own with two cars decided to leave mine there and take the other home this morning. So anyway went down to collect it this afternoon and she started fine as expected so i rolled a couple of yards then stopped again to talk, jumped back in the car put it in drive and it stalled. (strange i thought as its auto) tryed to start again and nothing it was just turning over, thought new pump might be at fault but no all was working fine there so spark was the next thing to check. Nothing from the coil pack bugger i thought now need a new one of them after checking all the fuses but then noticed the dreaded orange gearbox light flashing on the dash, so have removed ecu's now and will look at it again tomorrow but would this problem cause it not to fire?
Also anyone got any ideas of why this might have occured? ecu spike maybe as i was jump starting it. All help need before a have another wasted hour journey to work tomorrow when i dont have to be there.

[morgrp]

Can you hear the fuel pump prime when you switch the ignition on? Is it the fuel pump relay - Not an uncommon problem on 850/v70s

[Callyuk]

nope neither of them.
sorry should have updated this yesterday i went back down there plugged the ecu's back in and again she fired up first turn of then key put it into drive and within 60 seconds she cut out and wouldnt restart with them same symptoms as before so as a last resort called the rac out he did his check and it looks like the crankshaft sensor is only giving out a very week signal so iv got a new one on order should be here saturday and fingures crossed that will solve the problem

[Callyuk]

woo hoo car is running again i have no idea what was wrong with it as it was plugged in today while i was in work will find out tomorrow when i see the bloke but the main thing is she is running again

[Callyuk]

All sorted now and my faith in volvo has been restored after also resetting the ecu all previous boost problems have all gone and she finally feels like the t5 she should be

[Pot Bellied Fool]

Just wondering, how did you reset the ECU? My 850 T5 goes well enough (now that I've replaced plugs, distributor, rotor arm) but doesn't feel as 'rawe' as my V70 T5 did. You don't get that surge of power as the turbo kicked in so I'm wondering if there's boost problems with it - although the dashboard guage does move.

[Callyuk]

just pulled the ecu out of it and left it out over night