to give you some basic infor of the car it is a fully built b17 motor in a 95 civic ex, I am on aem and on msd ignition.

the story: I bought the car as is not too long ago mainly for the parts and was going to end up building a new project, after driving it I got use to it. So I was driving one night decided to get on the gas everything was fine, UNTILL I let get off the throttle and noticed my car was mis firing and was only on maybe 2cylds and was making a sparking noise as if a spark plug wire came loose. I pulled over, opened the hood and saw sparks shooting from the msd coil at the very top of it hitting every ground they came close to. I quickly drove it home (which it hardly made cause of how bad it was mis firing and on 2 cyldrs) when I got to my drive way it died, I got it to start again and pulled it in and it died again. Now it WONT spark.

My effort: I bought a brand new msd coil, brand new rotor and dizzy cap, as well as wire from the coil to the dizzy. Still no spark.. I went and got another obd1 dizzy just today.. still no SPARK. I checked my msd system and it seems it is running fine, I am getting power from the box and power from the coil, so it comes down to a fuse or relay in which I am not familiar of (im assuming). ANY ideas? what fuses should I look at and where would the locations of these be? I checked all the ones in the engine bay they look good, I checked all the ones inside they look good only ones I didnt check are the big fuses that are all black and I wouldnt know how to tell if they are bad anyways.. or could be a relay somewhere..? or...? please experienced input would help thanks much appreciated!

 

How about removing the MSD from the equation altogether?

 

UPDATE i removed the msd and still nothing.. So here's whats its doing I hooked all four distributor wires to spark plugs and checked for spark. When the car turns to acc I get one spark out of the plugs, when I turn it back off I also get just one spark out of the plugs, but when its cranking I get nothing...

 

I'm not sure what drives the MSD but I would check the crank position sensor.

 

msd is no longer in the picture, I replaced everything with oem parts, dizzy, dizzy cap/rotor and still nothing. Heres what its doing, when I switch the ignition to acc I get one single spark, when i switch the ignition back off I get one single spark. But when im cranking I get nothing. So the dizzy must be getting power, its even warm after a while of cranking I just dont know why it cant give it the spark it needs..

 

Check the crank sensor to begin with.It's basics.