2006 sx230 Middle Injectors not working after fast idle goes down

[vollender]

I have a 2006 sx 230. When starts up all 4 injectors will spray. When fist idle stops the 2 middle injectors will not spray. If I shut off for a few and pressure backs off then start all 4 will spray then stop after fast idle goes down. I put 2 different injectors in the middle and the same thing.

Is this a ecu problem

 

[Acard7]

More than likely, yes! Swap the ECUs and see if it follows.

 

[vollender]

Is ecu in black box on back wall

 

[dgfreeze]

Yes, it's in the big black box on the back wall of the engine compartment. It's a LOT easier if you have a second person to hold a wrench from the back side. (you need to remove the cleanout tray on the swim platform to access the back side) Otherwise, it's not too bad.

 

[dgfreeze]

You could also swap ECU's with the other engine, just to verify the problems follow the ECU. It's a simple and effective way to troubleshoot things.