HELP!! 1JZ is flooding due to injectors 3 + 5 having constant power???

[Wildsupra]

Having a problem with my 1j flooding on cylinders 3 + 5.
Its running completely stock motor with stock ecu.
I have put a jzx81 halfcut into my gx81 and made a patch loom to wire it all together.

Heres the story, car originally fired up and ran perfectly, for all of about 30 secs, then started heavily missing, due to vey large amounts of over fueling. I removed the plugs to find that cylinders 3+5 were full of fuel. So cleaned it out and cranked over engine, 3+5 injectors are constantly pumping fuel, first though was stuck injector, but this is not the case as when i un plugged the injector wiring plugs it no longer pumper fuel in and then on further inspection with the multi meter these 2 injectors are recieving constant power. I then unplugged the ecu plug which houses the injector trigger wires and power goes away.
I then thought maybe some how i wired something up wrong, but why did it run sweet at very first and not now? The other 4 injectors run as per normal.
I realise 3+5 are paired but what could cause it? is this the usual capacitor problem? I always thought th usual ecu capacitor problem cause the engine to cut out?
I drove the car very briefly after conversion, it had sweet power then did this problem then cleared then did tis problem and now it wont run sweet at all.

Any ideas at all?? Im quite puzzled now :/

Cheers
Matty

[wilbo666]

To me it sounds like the injector driver transistor inside the engine ecu is always on...!

I'd open the engine ecu and trace it back and measure it!

Cheers
Wilbo

[COS25T]

i had the same problem. i changed the ecu and the problem was fixed.

[Wildsupra]

To me it sounds like the injector driver transistor inside the engine ecu is always on...!

I'd open the engine ecu and trace it back and measure it!

Cheers
Wilbo

How fixable/ easy to diagnose is this wilbo? Is it worth stuffing around with or just get another ecu...if i can find one lol

[wilbo666]

I'd say it's def worth looking at. It's not real hard to trace back to the correct transistor and give it a quick check with a multimeter...

e.g.
http://www.kpsec.freeuk.com/components/tran.htm

Cheers
Wilbo