Hi All,
My head gasket went out last October on my 1993 80 series. After a bunch of personal drama I finally got it reassembled earlier this month but it won't start. There is no spark and no fuel despite it running when I started disassembly in Nov'21. The truck cranks strong with a brand new X2 Power AGM battery. I found a bad Circuit opening Relay and EFI Main Relay. These likely are the source of the no fuel issue but I'm bought a new fuel pump just to be safe and will put that in as preventative maintenance.
What I'm struggling with is the no spark issue. I replaced the spark plugs, spark plug wires, rotor, dist cap, and ignition coil all with OEM or Denso units. I ohm'd the new coil just to be certain and checked the air gaps in the distributor. I also checked the resistance of the distributor per the FSM. I've checked all the fuses and they are all good. Fuseable links are good. I get a CEL with key on. I have not yet checked the VAF or the TP but it sounds like those should be checked.
I have a few questions
1. Should the tach bounce around a bit during cranking (mine is not and to my understanding this points towards the igniter).
2. During the disassembly I found this wiring splice from one of the 7 previous owners. I replaced these spade connectors with butt connectors and hoped for the best. These run from the end of the fuel rail to wire harness junction just behind the battery. Does anyone know what these wires go to? I have a FSM but am not great at wiring diagrams so I figured I'd ask here before I dive into the diagrams.
3. Does anyone have any pictures of all of the ground wires for the engine that I can reference? I'm wondering if I just forgot a ground wire or something simple like that. I'll be going back and squeezing/pulling every connector this weekend.
My head gasket went out last October on my 1993 80 series. After a bunch of personal drama I finally got it reassembled earlier this month but it won't start. There is no spark and no fuel despite it running when I started disassembly in Nov'21. The truck cranks strong with a brand new X2 Power AGM battery. I found a bad Circuit opening Relay and EFI Main Relay. These likely are the source of the no fuel issue but I'm bought a new fuel pump just to be safe and will put that in as preventative maintenance.
What I'm struggling with is the no spark issue. I replaced the spark plugs, spark plug wires, rotor, dist cap, and ignition coil all with OEM or Denso units. I ohm'd the new coil just to be certain and checked the air gaps in the distributor. I also checked the resistance of the distributor per the FSM. I've checked all the fuses and they are all good. Fuseable links are good. I get a CEL with key on. I have not yet checked the VAF or the TP but it sounds like those should be checked.
I have a few questions
1. Should the tach bounce around a bit during cranking (mine is not and to my understanding this points towards the igniter).
2. During the disassembly I found this wiring splice from one of the 7 previous owners. I replaced these spade connectors with butt connectors and hoped for the best. These run from the end of the fuel rail to wire harness junction just behind the battery. Does anyone know what these wires go to? I have a FSM but am not great at wiring diagrams so I figured I'd ask here before I dive into the diagrams.
3. Does anyone have any pictures of all of the ground wires for the engine that I can reference? I'm wondering if I just forgot a ground wire or something simple like that. I'll be going back and squeezing/pulling every connector this weekend.