I swapped a used engine into my 98, I went to crank it over then engine cranks fine but will not fire. I tried to spray starting fluid in the throttle body, still nothing. I checked power to the coil, I have no power, checked the ignition power at the dist. block in the engine bay I have 12 volts, but at the ignition fuse inside the cab I have .03. I pushed the valve at the fuel rail, I get a small shot of fuel then nothing until I shut the key off and turn it back on. I have to get this going tonight so I can make it to school tomorrow.

 

I ran 12 volts to the coil, still nothing. Could my PCM be fried? I'm at a loss I need ideas.

 

Do you have spark at the plugs? Have you checked or swapped the ASD relay? Have you checked ALL the fuses?

 

no spark at any plug, i changed the relay and checked all fuses.

 

Well something is unplugged, not connected(as in a ground wire) or maybe crank pos sensor is bad. Maybe coil is bad . Hard to say without being there.

 

No info on your truck, no info on what year the replacement engine is, not a whole lot to go on.

 

its a 98 1500 360. The used engines block is a 95, the intake, all sensors, everything else is off my 98. I tested the coil per the haynes manual. I hooked a battery charger up backwards which kind of started this whole thing so I have a feeling I fried the computer but I was planning on testing the crank sensor. Tested all fuses like I said earlier, no power to the coil and the fuel pump will sometimes build pressure when the key first gets turned on but will not continue to run as the fuel pressure drops when I hit the valve. I checked all grounds I have 2 on the back of the block, 1 on the valve cover, 1 from the alt, and 2 other eyelets which go on the power steering bracket. I did not have any other grounds, checked all connectors, replaced the cam sensor. Like I said earlier the ignition has power at the dist box under the hood, but at the 10amp fuse in the fuse panel in the cab I have .03 volts with the key on.

 

Check the fuses at the distro box under the hood. There's also, I believe, a starter relay. Swap that one with your A/C relay and see what happens.

 

you should never charge a battery on the vehicle with the battery cables connected, thats just asking for trouble.
you are missing a couple ground wires. there should be one going from the battery to the cross member directly in front of it and there is one below the cowl above the driver valve cover that disappears behind the engine. also, the passenger valve cover has one attached to it and the other disappears behind the engine, both are connected to the body just below the cowl.

i just looked at my dads 98 and it has a lot less grounds than my 2000. mine has a wad of grounds behind the passenger headlight and 3 on the passenger valve cover.

 

I have all the other grounds hooked up, I never took them off I only removed all the grounds attatched to the block. Any way to get the computer tested? Where I have no fuel pressure/spark and I tried to swap the relays I have a feeling my computers cooked.