I have a 93 4Runner with 3.0.

I drove my daughter to school on Thurs morning and everything was fine. When I got home I noticed I had a slightly rough idle, but hardly noticeable. Later that night I got back in and it wouldn't start. It would crank but no fire. So I started to work on it yesterday. Check dist and all plugs getting spark. If I crank it for a while it would start, but run really rough and puff black smoke. So I know it's running rich.
So I started to pull plugs to see whats up. Plugs all wet but OK. Then I pull the intake tube, and gas poured out, and the upper intake all wet with gas and dribbling out. The first sound dampening chamber on intake tube was full of gas.

What would cause this type of flooding (is there a way for gas to inter upper intake from fuel rail)?

 

leaking cold start injector?

 

that was my thought

if the other injectors were leaking, the fuel wouldn't make it to the intake tube; the cold start injector, although I'm not 100% sure of the placement on the 3.0's, is up closer to the TB and intake tubing, so I could see that happening

could try just inpluging it, but if it's physically stuck open internally, you could maybe pull it off and try to clean it

a buddy of mine had a 90 with a 22re that the cold start injector would stick open on. it would start doing the same thing; runing rough, a little smoke; he'd pop the hood, tap on the intake rigt above the injector once or twice with a small hammer, and it would stop, lmao. funniest damn thing I've ever seen

 

I'll check that. I have my plugs out and my butterfly open to evaporate the gas. So as soon as that happens I'll try that. Any other ideas would be great too.

 

I think that's about the only way fuel would make it there .

 

I just put all the plugs, wires and intake tube back on back on. Fired right up and ran for a few minutes, then started puffing black smaoke and died. Unplugged the cold injector, measured resistance (3.6) OK.

If the injector is stuck open though, it would matter if it were unplugged, it's still going to leak, right?

 

it could be a mechanical failure of the injector or could be an electrical issue causing the injector to stay open. if it continues flooding with the injector's electrical connector unplugged then it's a mechanical issue.