Have Volvo Questions? Ask a Volvo Mechanic for Answers ASAP
this sounds like you may have disturbed the cam position sensor that lives on that end of the engine
its used for synchronise the fuel and ignition timing so I'd 1st check that its plugged in and if it is then disconnect it and with the ignition on and the engine not running then measure for 12V between pin 3 and battery earth
if this isn't there then trace the wiring back to the ECU , checking for damage and corroded connections as you go
if this OK then replace the cam sensor
do you still need help?
Bear in mind that the site takes a deposit from you at the beginning and this is held by the site until you rate my answer at which point the cash is split between the site and the expert. I am only paid for my work on this question if you rate my answer, using the star system at the top of the screen. Please do not forget! Thank you