1993 Cab, wiring harness, fuel injection (original in truck)

1991 engine (originally carbureted)

22RE 4 cylinder



I have read the other post regarding the same issue but mine seems to be doing something slightly different. When I turn the ignition over the truck cranks and dies, sometimes it runs for 6 seconds and sometimes it might idle for a bit and then die. We know it is getting plenty of fire, we have tested and it runs like a champ on break cleaner.

Fuel Pump (new) is working and has great pressure.
Fuel Filter has been changed.
COR has been replaced.
EFI relay has been replaced.
Checked fuses.
Checked grounds with power probe, checked everything with the power probe.
Replaced the air mass meter (one prongs resistance was out of spec)
Listened to the injectors and they are all tapping away



Our initial thought is a broken wire because the issue started after we changed the intake, we have split the intake again and searched for it but haven't had any luck.
**The ECU is a TWO PLUG and we cannot find a wiring diagram or a new ECU on our parts trucks**

Is there something we are missing that we can try before taking the entire wiring harness out and dissecting?

Thanks for your help! Emily

 

Welcome to YotaTech.
How do you know? (If you say "we cracked a fitting, and fuel ...", stop right there. Go back and replace the pair of crush washers on that fitting. They are one time use, and must be replaced every time someone loosens that fitting.)

Why? What diagnosis did you do that lead you to this?

No you didn't; you don't have an "air mass meter." You have a Volume Air Flow meter (different technology). This makes me question where ever you got your spec.

If your truck runs a few seconds and quits, that's the classic sign of a VAF-COR problem. https://www.yotatech.com/forums/f116...-quits-312747/ This post covers the diagnosis. As always when working on any vehicle post-1960, you need a multimeter. Just installing a "new" part is pretty much meaningless.

Good luck!

 

We've simply always called it this, specs are here.

Specs

We simply replaced the other things for trial and error using a parts truck.

Thanks!!


Sorry, I'm new to forums so learning how to respond properly.
I wanted to add that its a rock crawler rig, the fuel pump is a E2000.

 

OK did the jumper jumper and she will idle and followed all steps and everything checks out. When you press the throttle she spits and sputters, any thoughts?