I have an 89 pickup 3.0 that will crank but not start. However with a little starting fluid it will start. On the B+ terminal Im not receiving any voltage. I put a new EFI relay in with no luck. I checked voltage on the bottom on the fuse box and I have 12volts going to the EFI relay but nothing coming out of it with the key on or while cranking. I can't figure out why? Where else should I look?
Thanks for any help!

 

Did you check the EFI fuse in that fuse block? Pull the fuse out and ohm it. Never ohm a fuse in-circuit.

Either that, or check for a broken wire on the back of the fuse block, either to, or from the EFI relay. My money is on the fuse, though.

Good luck!
Pat☺

 

The truck won't start, starter fluid or not, if you're not getting 12v "out of" the EFI relay. So something is off in your diagnostics. Or, you have an intermittent issue that is masked by your use of starting fluid.

So look systematically. You think you have voltage going in to the EFI relay (pin 5), but nothing coming out (pin 3). That means the relay hasn't closed. It's closed with 12v from the ignition switch through the IGN fuse. Have you checked the IGN fuse? You can pull the fuse out and "ohm" it, but that's doing it the hard way. ATC fuses have two metal points on top for just this purpose. With key-on, check for 12v to ground on each point. If you get 12v from one but not the other, the fuse is blown. If you get much less than 12v on each, you have no power to the fuse. (12v from both is normal).

Remember: if your truck started, even for a few moments, the EFI relay closed and provided power to the engine circuits. Replacing the EFI relay and checking the EFI fuse did nothing.