2.3L ('83-'97) Will only run with three injectors plugged in.

[jpaino123]

Truck just quit on me this morning. Ran through the basic troubleshooting. I have good spark on all 4 cylinders and good fuel pressure. Timing is right. However I found that unplugging any one of the injectors it will fire. It doesn’t run well but it runs. If i plug it back in it dies and won’t start back up. Any ideas?

 

[Fredness]

On any cylinder or is it one specific injector?

 

[PetroleumJunkie412]

One or more of them is dumping fuel. Pull them, hook them to a 9v, use tubing to adapt a spray can of carb and choke cleaner to the injector to form a seal, and spray while opening and osing injector with voltage.

If it doesn't work, report back

 

[PetroleumJunkie412]

Or get on a site @Cees Klumper mentioned the other day. Cheapest rebuilt injectors I've ever seen.

Your truck is probably old AF. Be nice to it. Get it injectors.

 

[PetroleumJunkie412]

I'm probably wrong about all of this btw.

Except that @Cees Klumper dude. He's cool.

 

[tomw]

Given that the injectors all have 12v on one conductor, and are supplied with a ground from the computer to open the pintle, and adding a 4th injector... it is possible that the driver source has limited conduction, and thus cannot supply all 4 injectors( all have some poor conduction to ground that is too much leakage?)
I would check at rest voltage on the injectors. If the computer went bad, it could allow conduction, and open an injector, dumping fuel into the intake.
I do not remember if an 88 has paired injectors or is SEFI. If paired, 1&4 will squirt at the same time, if SEFI, the injectors will fire in firing order 1-3-4-2, one at a time. Maybe you should borrow a set of NOID lights from an auto parts store that lends.
tom

 

[Fredness]

"Batch" injection (pairs) on ALL 2.3's until the EEC-V '95+ Ranger....