I have a 92 S15 Jimmy that will not start - fuel problem. Before I go out and buy a brand new CPI Spider (or junk the Jimmy) I thought I would see if any one could provide me with a method to actually check that the CPI itself is functioning. Right now I have the upper manifold off. I have a 60psi fuel pressure reading. Prior to actualling buying a pressue gauge, I tried to "shotgun" the problem (changed fuel pump and fuel filter). Tried to "hotwire" injector using a battery charger, saw no fuel coming out of poppet. Bought a used CPI on Ebay (came without the poppets - had to swap in old ones). Again tried to "hotwire" CPI, plenty of "clicking" but no spray.
Could I have fried CPIs by hotwiring? Do the poppets actually need to have intake vacuum to spray (i.e. do I really need to put everything back together and try to start it)? Has anyone actually seen the poppets spray either by "hotwiring" or by letting the ECM do it? Thanks