I had a front passenger side Tire blowout on the freeway back in September rip up the wiring harness and pull wires out of the fuse box. I have replaced the fuse box soldering all the wires back in. She turns over and is getting fuel but I'm not getting spark or 12v at the coil. The FSM refers to three wires going back to the ECU but I can of only find one of them. I have tried finding the problem a few times but no luck. Any thoughts or any flagstaff locals willing come join the wiring fun? I can provide crappy jokes, a six pack, and cash for your trouble. Thanks!

 

Are you reconnecting the torn wiring or did you get a replacement harness?

 

Thanks for the reply! I soldered everything back together and replaced the broken fuse box.

I think I found my issue today. It looks like all four of these wires in this wiring diagram that I have green boxes around connect where they need to go from the igniter. I'm having trouble figuring out where this black wire goes, however. It looks like a ground but its not showing continuity when I use a volt meter.

Is this black wire supposed to be a ground?

This shows it goes back to the ECU, but I couldn't find a pin that it was connected to.

 

Does your truck have a tach? That might be the tach connector.

 

No, she doesn't have a tach. The black-red wire next to it goes to the "ign" fuse in the driver side kick panel.

 

Far as I know that is the tach connector. Mine is the same (no tach) just with a rubber cap over it.

 

That makes sense, but I couldn't' get the volt meter to show continuity to the similar wire on my truck. Anywho, the sensor ground wire "E2" doesn't seem to be grounded. I may check that next. Although it doesn't appear to go to the engine bay at all, so it shouldn't' be damaged.

Chasing gremlins is fun!

 

By process of elimination, it can only be the tach signal.

There are three plugs, one two place to the dizzy, one three place to the ECU, leaving a two place plug with coil power supply on one side and the tach output on the other.

 

That's what I was thinking. I don't have the RE so no 3 place plug for the ECU. I do have the dist plug and an open plug for a tach.

 

Alright, thanks for the help! I went through and tested coil resistance and it seems to be a little high, 1.0, spec call for 0.5 - 0.7. Voltages for the coil and igniter seem to be good now. The last time I worked on it with my father he checked the voltages and said it was not getting 12 v....

I'm going to get a new coil and see if that helps.

 

Installed the new coil, now I've got spark and she runs temporarily on starter fluid!!

I'm going to try jumpering the fuel pump tomorrow and pulling the cold start injector to look for fuel.

 

Fuel pump's not turning on with jumpered wire, "IGN", "EFI" and "ENG" fuses are all good. There appears to be 12v at the efi main relay as well. I'm not getting 12v at the fuel pump check connector.

 

Update! I got her running!!! The circuit opening relay was busted, replaced that and the fuel pump started working again.

Drove her down to Tucson and back for the ultimate test and she did great!

Thanks for the help guys!

 

Good to know what the problem was and congrats.