88 k5 won't crank

I can't get my truck to crank. I have checked the fuel pump. I have also reaplaced the fuel filter, Engine Computer, MAP sensor, Fuel Relay, and any blown fused under the dash. The motor cranks right up when I shoot ether into it. What else could it be?

check 2 make sure the injectors r getting a signal. check the union on the grounding side of the wiring harness (about 6 to 10 inches from the injector plugs). i've seen them corrode here and stop the signal from getting through.

Same motor, same possible issue...

see link from suburban forum..

http://www.chevroletforum.com/m_13174/tm.htm

Tommygunz, check that 'burb forum (http://www.chevroletforum.com/m_13174/tm.htm) for more input on this issue.

touche'

hi! when i turn engine over with outer manifold off there is the injector unit i have removed pipes and poppet valves and let them hang loose and there is no fuel coming out of them when i turn over engine,i have a 12volt supply going to injector unit,i have replaced unit with one off another van and still no fuel coming out of pipes. thanks for help wayne.

Hey, i had the same problem. I checked everything but it ended up being the piece in the distributor cap. I cant remember what it was called but it is a small rectangle piece. Check that and it could fix your problem. My 88 K5 started choking and then it would not start. I checked the same stuff you did and finally figured it out. Hope this helps.

it's called an ignition module. check the link i posted from the 16th of Nov., deals with same issue.