i have a 1987 volvo 740 turbo when i got it it vranked drove for a while i replaced a sensor it ran good but still felt like it was not 100% so i replaced fuel pump(s) Coil plugs wires turbo relays fuses distributor timing seemed off so replaced timing belt now no spark at all please help tia joe

 

you replaced all those parts based on the 'feeling' that it was not '100%' ? did you do any diagnostics that showed the parts you replaced were in fact defective ?

It was running before you changed the timing belt, and now its not running? wild guess says you got the crankshaft way out of phase relative to the camshaft when you replaced the timing belt. or you mangled the wiring to the hall sensor in the distributor, thats the master timing source for LH 2.2 cars, no timing means no spark.

 

i should have went into more details sorry the issue was it would drive great for awhile and then shut off you bump the switch it would fire back up and run 2-20 miles and shut back off i read up on it and changed rhe radio suppression relay it worked great for a few days and atarted cutring out i noticed the sythoms of fuel pump so i changed a bad fuel relay it worked a few more days and acted up again low fuel pressure so i changed both fuel pumps and filter it ran good but had a bad miss so i changed the plugs coil and wires it still sounded like it had a dead spot so i researched more and read about the hall sensor so i just bought a brand new distributor and went ahead and purched a new timing belt also got it all installed and now no fire at all i have fuel pressure everything works the way it should except no fire oh and i changed out the sensor in the firewall

 

bump the switch, meaning the ignition key? sounds like the ignition switch is failing, then.

so you changed the distributor AND the timing belt at the same time and it stopped running? then either of those could be the problem. new does not automatically mean good, in fact the quality of replacement parts is at an all time low. I think I'd put the old distributor back in, make sure you index it properly, and I'd triple check that you got the timing belt indexed correctly

I'm not sure what this sensor on the firewall is.

 

Sorry once again for little details by bump the switch i ment turning it over to recrank it. And the icm is what i ment by the one on the firewall i also put all stock parts back on it just to make sure i disnt have bad ones i was thinking my timing might had been off i reset the timing 4 times same results does the turbo version need to be advanced i couldnt find one for the b230 turbo charged

 

I believe the turbo is the same 12 deg. BTDC at idle as the non-turbo (I never had a LH2.2 turbo, mine was LH2.4 which has no timing adjustment). the timing advances to 20, even 30 deg. BTDC under load and RPMs, but it never retards below 12.

 

Im leaning towards timing cause it cranked and ran before i put timing belt on but at the same time ive went over the timing many times and i "think" i have it right maybe its ecu ? Im so lost on this the car only has 127k miles no oil leaks I'd love to get it back on the road

 

have you tested to see if you have spark? remove a spark plug, plug it back into the spark plug wire, hold it with a pair of insulated pliers against a engine grounding point, and have someone crank the car for a few seconds, you should see a fat blue spark every two engine turns.

 

Yes ive checked it that was and with my meter also held it in ny hand to check nothing at all

 

with the ignition switch on, is there 12V on pin 15 of the coil ? thats the blue wire on the side of the ignition coil.