1jz overfueling problem

[Master Bator]

-So driving down the main drag in town, stopped at light, then car dies.

-try to start it up, nothing. give it throttle while trying and it started but is smoking out hood and exhaust. i instantly smell fuel and cut through traffic, turn car off and coast to a side road

-Discover the problem to be over fueling, the reason under the hood was smoking was cause i have an exhaust leak from turbo to elbow and it was pissing on manifold and burning.

-after a bunch of fucking around and checking basic shit, i pull coil packs and spark plugs to determine which cylinder was overfueling.

I pull coil pack plugs and they all made a difference but number 3.

-so i pull number 3 plug out and its soaked in fuel.

-try different plug and different coilpack, doesn't make difference.

- I try a different coilpack clip (from cylinder 4) and it seemed like it made a difference, because when i pulled it off again, the engine stuttered and stuff.

- So this tells me that my number 3 coil harness or clip or something is messed up.

-So i figure i can just pull the clip off the number 3 injector and drive home on 5 cylinders.

But with 5 coilpacks working and 5 injectors plugged in. Its still overfueling like a bitch and with any throttle it bogs down a bit and then power and then bogs down. etc etc.

So now im stumped like crazy.


I have no other ideas as to where to look. car is on side of road so hard to start tearing it apart.

Why is it still overfueling even though i pulled the injector clip? Could it be a different cylinder too?

All the other cylinders are firing cause when i pull clips i can notice a difference, only on 3 it makes no difference.

So i have overfueling problem and coilpack harness problem.

What should the resistance be in the coilpack clip.


All help is appreciated. thanks a bunch

 

[Master Bator]

stock mines tuned ecu with emanage blue tied in



can i just plug my buddies 1jz ecu in and try?

 

[f00g00]

Any codes?
You can pull your ecu cover and check for leaking caps which is usually the culprit for fuel flooding issues. It happened to me days after my swap so I had a local shop change them out. Also try without the e-manage and see if that does the trick. There is also an LED you can check on the e-manage to make sure its good and you can check it for error codes. If the LED is red then somethings wrong. You should be able to just unplug the emanage and go back to the JZ ecu.
I would say yes, plug in your friends, as long as it matches your harness, but run it without the emanage. Also check all the wiring between the emanage and factory wires.
http://www.greddy.com/upload/file/e-manage_Blue_Install.pdf
link only shows the JZA80 ECU

 

[Master Bator]

Can i just unplug the emanage? it won't delete the tune or anything?


I don't know how you check for codes on this, but my check engine light isn;t on.

I'll check the emanage for the led

 

[f00g00]

I don't know anything about the emanage but it should store the tune but Im not sure. You will have to hook back up the map sensor wire to fully remove the emanage and try just the mines ecu, everything else should just be a pickoff from the harness.

 

[Master Bator]

Ok. I was just going to ask. Cause I unplug my e manage and it won't start. Plug buddies ecu in without emanage and it won't start. And then buddies ecu with emanage and same problem is happening

The active light on the emanage on the left side is red ad it flashes red. I know that isn't good

Which wire is the map sensor wire ?

 

[f00g00]

If you look at the link I gave you , in it is the wiring diagram and it shows the green and white wires going to the emanage as the map sensor wires. If it was done with any forethought, the two wires will have opposite connections so you can just disconnect and connect original back, then re connect the emanage if you so choose. I.E. The green has a male and the white has a female connection. Or you could unplug and just bridge the green and white on the front of the plug for troubleshooting if the harness is all taped up. Page 25 of the link I sent you tells you how to diagnose the red led error codes.
Good Luck.

 

[Master Bator]

yeah. I found that the plugs on the map sensor were yellow with red tracer, brown and white. I could see the only one spliced in was the yellow with red tracer so i just cut it and put it back to the factory wire. But car still only runs with emanage plugged in

 

[Master Bator]

Fuel being dumped into engine. So I read a thread about a guy with same problem. He took gas cap off. So I Took gas cap off and it ran like nothing was wrong. So I start driving it home. The whole way home it's still smoking white (fuel) from exhaust. I figure it's just left over. Get about 5 kms and it's starts smoking like Crazy again. So now I'm back to square one. Overfueling. I think I can narrow it down to too much pressure. I drove that 5 kms with gas cap off. Now I'm stuck downtown still

All I can think of is fuel pressure regulator. It's stock. Is it common for them to fail?

 

[destrux]

You can't just pull and injector and coil wire and drive on 5 cylinders.

Sure, you eliminated the raw fuel that was coming from cylinder 3- but you just created another problem.

The oxygen sensor is seeing all the unconsumed oxygen coming through that dead cylinder and thinks the car is running lean, so it adds fuel like crazy. Which will make all the other cylinders overfuel.

Connect everything back like normal, reset the ecu by pulling the battery cable or the ecm fuse and find out why cylinder 3 is acting up. Check your coil wiring, check your compression/leakdown, check your injector wiring (if it's bad and causing a lean misfire, fuel will still come out the exhaust because it was too lean in the cylinder to burn it), and check your injector for clogs or leaks (try swapping injectors if having them professionally tested is a problem). If you're running stock style side feed injectors check the lower injector body o-ring by pressurizing the fuel system with the rail unbolted and lifted up, if it leaks while it's bolted down you won't be able to see it on this style of rail and it will dump the fuel right into the engine (unlike top feed injectors, where external fuel leaks are always visible).

 

[f00g00]

do you have any of the optional harnesses connected for the emanage?

 

[Master Bator]

it was ecu. Put buddies ecu in. and it ran fine.

im not even running a o2 sensor :O lol. I got a single turbo though

 

[f00g00]

Mines ECU's are only made for bone stock engines. I sent them an inquiry before and told them my mods such as upgraded twins with steel wheels and their reply was:
Thanks for the inquiry. Unfortunately we do not have data to be able to map your ecu with the specified modifications.We only can modify that the ECU for the vehicle in its stock state. Best Regards, Jody MAYOMine's Co., Ltd. 5-7-25, Hayashi, Yokosuka-City,Kanagawa, Japan 238-0315

So I would think going single with a mines would be a slight problem.

 

[Master Bator]

Ive had my single turbo setup since july 1st, and been daily driving the car single. I don';t know how it makes a difference when im running the same boost. As far as im concerned, the engine and ECU know no different

 

[suprafanatic]

make sure you still un-do your intercooler, it most likely has a bunch of gas sitting in it. Mine had a ton of gas sitting in it and the pipes when my engine flooded like this.

 

[Master Bator]

oh shit. i forgot to do that. I bet thats why my car was still smoking white for a while after, burnt all it off.

I hope i didn't do anymore damage. I just wanted to get my car home. Cause i will be tearing engine and car apart this winter