looking for some help here, im lost at this point lol, long story short i acquired a 93 pickup with a 22re manual trans, couple took very very good care of this truck. they told me the truck ran great (i have seen it run for years and have worked on it multiple times) well it was running great they parked it for a few weeks then it wouldnt start for them, they had someone look at it and found 2 wires broken(eaten by a rodent) at the ignition module to the distributor and 2 wires at the module connector to engine harness, the guy repaired the wires and still wouldnt start, then they replaced the ignition module 2 seperate times and a distributor and still no start. so then i received the truck, i look at it and it has fuel pressure, and spark and every once in awhile it would fire then die instantly, checked the cold start injector and i has 12v power but no ground from the switch so i removed the injector and cleaned it and ran a seperate ground just to see if the injector would work and it does work when i ground the green wire. i checked injector pulse and on both sides of the injector when unplugged has 12volts, use a noid light and has NO pulse, also tried a noid light on the cold start injector and it didnt work...i checked everywhere for a broken wire and found nothing that i could physically see, for ˟˟˟˟s and giggles i put another module on it and still doesnt run.. grabed a computer from ebay and put it in and still no injector pulse.. anyone got some pointers on where to look? any help would be appreciated

 

Hi, Pls refer to schematic below.
When IGN is on, there would be constant 12V on positive sides of the injectors. There are 2 wires (enclosed in green) coming from ECU that provides ground pulse to the negative side of the injectors. That controls injector pulses. They run under the intake exhaust manifold., and a few of us have found those with corroded/broken crimps .Please check those. Sorry I don't have my FSM handy and I don't remember which ECU pins, but they should be a white and a white wire with red stripe.

 

Thanks for the reply, i am assuming you mean under the intake manifold not exhaust manifold, i will take a look tomorrow when im at the shop. i noticed that diagram is for a older model with a injecotr resistor box my 93 does not have that but the wiring might be the same.. i will pull the manifold tomorrow and see what i can find

 

Sorry, yes, I meant *intake* manifold.
While u have it apart, pls consider rerouting wires that do not absolutely have to run through there for ease of future work.
QUOTE=bradspeed35;52501411]Thanks for the reply, i am assuming you mean under the intake manifold not exhaust manifold...[/QUOTE]

 

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didnt get much time to play with it today had a ton of work going on at the shop.. but by surprise a 93 manual trans pickup showed up for a smog check and i asked the customer if i could check something real quick.. i swapped my ignition control module with coil to there truck and it did not run there truck, i put there module into my truck and my truck still did not start but i didnt want to keep playing with it incase i have a wiring issue taking out the module.. put there ICM back in there truck and it fired right up.. i checked my truck for codes today and i am getting code 22, 24, 31,41 after looking at a few diagrams it looks like i definetly need to look into the wiring a little more specially the e2. e21 wire from the computer

 

Sounds a lot like my intermittent problems from my 3vze. Unfortunately even if rats didnt cause it, a wiring harness from 1993 is still 30+ years old. Breaks can hide in dried old wiring. Replacing some wiring in the engine bay may be an option. Otherwise I would guess electrical problems elsewhere. The rats are a sign something like that could have happened anywhere else, definitely check all the tps, air flow meter, distributor, and injector connections closely. Also just making sure but airbox air flow meter must be plugged in and plumbed to intake for the engine to run, it cuts ignition like you mentioned in symptoms if it is not plugged in. It will allow about 3-5 secs of ignition before cutting entirely. If plugged in and not plumbed correctly it will hardly run at all.