1JZ running very rich - fuel in exhaust

[GN_Convert]

I recently got my 1JZ in my 90 Supra, it will start and run, but not for long. After 20-30 seconds of running, I start getting fuel coming out of my exhaust and several of the spark plugs are coated in fuel. I can dry them off, get the standing liquid out of the cylinder and start it up again to the same end result. I checked the coils by pulling them and putting plugs in, all the coil packs are making sparks. It seems that #2 and #6 are always dry, but the other cylinders flood out with gas. Could an injector be sticking? the ECU be messed up? I opened up the ECU and the capacitors looked fine. Also, I am getting no error codes. I have a new MAP and O2 sensors.

Ideas?

 

[destrux]

I just had injectors sticking open on my 1JZ. You can pull the fuel rail and turn the key on to run the pump on this car, cause the rail being bolted down doesn't hold the injectors in like with a top-feed rail. That way you can see if any injectors are dripping, or even squirting fuel, when they shouldn't be. You can pull the rail to test and to change the injectors without pulling the intake plenum, even though alot of people seem to think it's not possible. Just have to remove the ISCV, throttle body, and some little hoses and brackets. The rear fuel rail banjo bolt is the hardest thing to get to. Also, all the gaskets are reusable.

If it's not injectors you might have cracked ignition coils. They still spark when tested outside the cylinder, but when it's running the spark chooses to jump the gap outside between the coil body and the metal bracket instead of jumping the gap in the cylinder on the sparkplug because the air/fuel mixture makes that gap harder to jump.

 

[RacerXJ220]

Bad ECU?

 

[GN_Convert]

Thanks, I will check the injectors. What are the odds that 3 or 4 injectors would all be bad?
Is there any way to test the ECU other than swapping it out?

 

[GN_Convert]

OK, I checked the injectors, none leaked any fuel with the ignition on. Also, for giggles, I disconnected the O2 sensor to see if that would help, but it still was pumping way too much fuel into it.
Would the capacitors in the ECU cause this? I can replace them a whole lot easier than swapping out ECUs.

 

[GN_Convert]

I opened up my ECU and found a few leaky capacitor! I just ordered them from Mouser, hopefully in a few days I will be able to take the 1JZ out for a spin.

 

[RacerXJ220]

Usual suspect.

I remember when Suprahero was a JZ virgin with his 1JZ stories. Happened to him too, lol.

 

[GN_Convert]

It is funny $4 in parts and it may solve those problems.

 

[GN_Convert]

I replaced the capacitors in the ECU, it ran good but would not go above 2000 RPM. I replaced the TPS sensor with the correct one, and it runs great now! unfortunately, the fan hit the shroud and shoved a piece into the the radiator. The new radiator will be in tomorrow. The shroud is beyond repair, so it will have to go away. I hope it does not cause any overheating issues.