Hi i'm new to this and I sure hope you guys can help me? I have a93 G20 sport van,it has the 305,it gets no spark out to the plugs,so far I have replaced the coil,knock sensor,ignition control module,ecu,tcs,distributor pikup coil,rotor,cap,tested all the in line fuses and still I am not getting any fire out to the plugs?When I Run the diagnostic test aldl B-to the ground it pulses 3 pause 3 which is code 43 that says MAP sensor MY ? would that make this van not start? I have put so much $$$$$$ into it now Please help?!!!!

i dont think the map would keep it from starting. you check to see if you have power and good ground to pcm? ohm wires to icm? make sure they arent shorted to ground?

33 MAP sensor signal voltage was too high (low vacuum) for 5 seconds when throttle opening was under 4%.

Make sure your getting a full 12 volts to the pink wire on the coil. More than once I have had to repair the wiring harness because the splice breaks loosing power to the coil.
1992 GMC C1500 PICKUP Ignition Coil Connector

Well ihave been busy trying all the things that every body has suggested and so far I have not had any luck.I tested to make sure that I had 12volts at the coil to the cap and I have cleaned all the ground wires on the block,I traced the wires coming out of the distributor and they all don't look broke or burnt,clear to the ccm or the big brain box as I call it.I cannot still figure out WHY NO FIRE OUT TO PLUGS when everything is new? What am I overlooking? PLEASE HELP!!!!!!!!!!

you check the pcm power and ground on pink and black wight on the diagram its toward the top

hows ur alternator doing?

that was me just kinda saying what could be something stupid out of blue btw. since u pretty much did check a lot of important things. lol
are u super possitive that you dont have no spark at all? i though i didnt on our 87 G25 van w/305 untill i start adjusting a timing and it picked up and ran.
btw how did it all happened to begin with? one day spark j/went away or?

I just had a thought, have you checked to see if the the dist is turning while it'* cranking? Perhaps the timing chain broke and you don't have an electrical issue.