98 GST has injector 1 and 4 dry

[coguy1234]

I have a 98 gst stock. Fairly new rebuild. Has ran good for a year after. Then I started getting the P170 error code. Something to do with fuel control. After a while it started running on just cylinders 2 and 3. And getting a P301 code. Which is something like. Multiple irratic cylinder misfires. I have changed out the ecu with a know good. I have tested fire in all cylinders. And have tested the injectors 1 2 3 4. All tested good electrically. I replaced the plugs and did some testing. I found that cylinders 2 and 3 have fuel and look like they are running. (obviously engine runs like crap) but cylinders 1 and 4 are dry and still look like new plugs. I have voltage to the injector and have tested the wiring to the injectors. Which shows that I'm not getting voltage pulse to the injectors 1 and 4.
Observations:
I have fire to 1, 2, 3, and 4 I have fuel and fuel pressure on fuel rail
I swapped out the ecu with know good.

What could be wrong with it? And does the Ignition power transistor have anything to do with the injectors?

Thanks

 

[SexperT]

Have you replaced your metal box attatched to your firewall? I forgot the name of it, but its metal it has 4 white wires going to the injectors. Good luck, and yes, the transistor has to do with fuel injection. I have a spare one, but i dont know if it will work on 2g's.

 

[Rob10_99]

sounds to me like the other box went out, or there is a wire loom that wore through.

have any aftermarket stuff installed recently?

 

[coguy1234]

The ignition power transistor sounds alot like the problem. The chiltons manuel states that 2 pins on the tran module control cylinders 1 and 4. and the other pins on the tran mod control cylinders 2 and 3. But it does not say anything about that only being the spark or could have something to do with the injectors energizeing.


Spoke with a Mitsubishi tech. He said the power transistor module has nothing to do with the injectors. He was leaning toward the computer. But again I swapped out a know good ECU. Last night I pulled the wiring harness out to check for scuffs or anything shorting. Everything looked good. My next question is what does the PCM have to do with the workings of the injectors?

Thanks for any help