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pull no 1 plug and turn the crank until you feel compression under your thumb over the plug hole.. Keep going until the timing mark lines up with the pointer ( about 10 degrees advanced) check and ensure that the point gap are set correctly Place the rotor button facing no 1 plug lead or a mark in the body of the distributor. (hacksaw cut across the lip) place the distributor in the hole allowing for the rotor button to turn because of the cut of the gears . Turn the ignition on and turn the body of the distributor until you see/hear a spark across the points. lock the distributor at this point (This should be just as the points open in the direction of rotation) fit the cap and fit the leads in the firing order.This will get the engine started and by the use of a timing light on no 1 cylinder lead you can set the timing exactly.
does it run rough only at idle you should test egr valve also clean idle control solenoid use air intake cleaner also check ign timing and cam timing hope this gives you a few ideals
it could be the alarm.
does the car turn over as it used to before this problem.if it does then your stater ok.check the alarm system and other stuff.plugs leads rotar cap ...etc
make sure the battery is ok check spark plugs distributor cap and rotar arm for any wear or damage if it has original plug leads replace them also make sure correct grade of oil in engine also clean throttle body
try spraying some easy start into the air intake while someone operates the starter if it trys to start you have a fuel system fault have you checked fuel pressure at injector rail you need to do this using gauge and check against volvo spec if low it will never run if ok check feeds to injectors using multimeter if no feed check relevent fuses if ok using multimeter check continuety of injector wireing back to ecu if it did not try to start using easy start check timing belt is ok and engine has compression
well you might have"bad ign wires" or bad ign coil!!!!O2 sensor wouldn't do that usually miss fires is wire ,coil, broken or crack porcelain on spark plug usually done on installing them!!!!!! I know the three spark plugs closest to fire wall are not easy to get at and some time spark plugs get cracked and over looked good luck
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