fuel streaming from exhaust, literally!!!

[midnightSAS14]

ok i have a 1995 240sx w/stock ka motor, i have replaced the injectors from another ka. rechecked the ecu connections, the fpr is holding pressure, and all injectors are recieving a signal. Replaced the plugs do to the other ones being fouled out. Compression test shows 150,125,125,150 from 1 through 4. No CELs other that a transmission issue(automatic). What could be some other factors to look into for this excessive fuel problem? car mods:header, full exhaust, hardpipe intake w/MAF adapter. Any help or suggestions would be greatly appreciated!

[midnightSAS14]

tried another ecu(same nissan part #). Originally showed a CEL for a bad MAF, which was replaced!

[gumby74]

Does the car run at all?Is this something new or has the car/engine always had issues? Thats just scary stuff man.

[midnightSAS14]

Does the car run at all?Is this something new or has the car/engine always had issues? Thats just scary stuff man.

the car does run, very roughly(obviously). the car never had these issues until the customer tried to turbocharge the motor, but for some odd reason it would only build 1-2psi of boost(tried diff manifolds,turbos with no luck).it had a greddy e-manage installed.Not fully though, only as a makeshift SAFC. Bigger injectors were installed. Everything was then unistalled back to stock, save for the header and hardpipe intake. it is scary sh*t!!! This is my first run in with this vehical, so all this info is from previous techs and the owner.

[midnightSAS14]

basically i know that there is excessive fuel from somewhere. Injectors are not sticking, FPR is holding pressure so the diaphram in it is okay. I used a noid light to check the signals to the injectors which checked out okay. I double checked the ecu wiring post E-manage uninstall. I am looking for other possible reasonings for the extreme amount of fuel being dumped into this motor!

[meangreens14]

this is a wild guese, but is the fuel system maybe stuck in "prime/start" mode? that would cause more fuel to be dumped in wouldnt it? i may be way off but its just a guess.

[gumby74]

I was at a shop earlier today and brought up your situation. The tech looked baffled and could not think of any way fuel would be coming out of the exhaust.If the engine was sparking you may get some nice flames out the back though. He suggested the usual culprits and move up from there.Check ignition/cam timing, verify spark and wire placement, alternate ecu then verify injector size blah blah blah. You get the hint.Nothing I can really think of myself, but I will ask around, maybe someone local can take a look at your ride for a reasonable cost.

[rwilliams]

I am having the exact same problem with a 95 altima. Have done the same tests as you, with no luck. I am at a complete loss as to what to do next. Have you had any luck yet?

Rick

[midnightSAS14]

this is a wild guese, but is the fuel system maybe stuck in "prime/start" mode? that would cause more fuel to be dumped in wouldnt it? i may be way off but its just a guess.

thats my next conclusion as well. I came across a TSB with this same problem.ill post as i find. Thanks guys!!

[rogoman]

You're sure the wiring is back to stock after removing the E-manage unit.

You may have leaking fuel injectors. To test them, unbolt the fuel rail from the intake manifold and pull off the entire assembly. Keep the fuel hoses still connected and don't remove any individual injectors. Also keep the electrical connectors on the injectors. With the assembly now away from the intake, turn the ignition key to the run position WITHOUT STARTING THE ENGINE. Now observe each injector to look for leaks. There should be no drips.

Make sure you have at least 4 spare insulator rings for the injectors in case some are damaged during rail removal.

[rwilliams]

My situation with the Altima is that the excess fuel is being dumped into the #1 (drivers side) cylinder and is not only going out the exhaust but also into the crankcase. I tried unplugging the coolant temp sensor but the engine did not start and the cylinder filled up with gas and locked up the engine. This thing is killing me.

Rick

[jkm_250x]

im no genius but this is easy to know why how to fix it well sounds to me like your 1 running way way way to rich and that would be explained my the injectors if they arnt the same size so mess with your fuel and air mixture 2 you have a cyclinder missing this would solve the rough running and low boost so go threw make sure all your spark plugs are sparking this could be as simple as a bad plug wire cause if it was sparking at all some fuel would get burnt and you wouldnt have fuel running out just a wet smokey exhaust

[480sx]

im no genius

Really?

Lol sorry, but for real, use punctuation, and re-read your posts before you post them, it will help out alot.

I would make sure each cylinder has spark before you pull your fuel rail off. It does sound like its possibly a leaking injector, that would make sense. Could also be that one, or more cylinders arnt getting spark. Leaking injector is way more probable, but checking for spark is easy.

[midnightSAS14]

each plug is firing, with fresh plugs, the wiring was triple checked. It is back to stock correctly.checked the injectors for drip leaks first thing, and they are all fine. i also have oil inside the crankcase.havent had a chance to jump back on this car yet. but will update as i progress.

[verSat1l3]

im no genius but this is easy to know why how to fix it well sounds to me like your 1 running way way way to rich and that would be explained my the injectors if they arnt the same size so mess with your fuel and air mixture 2 you have a cyclinder missing this would solve the rough running and low boost so go threw make sure all your spark plugs are sparking this could be as simple as a bad plug wire cause if it was sparking at all some fuel would get burnt and you wouldnt have fuel running out just a wet smokey exhaust

omg its really hard to read this kind of post because you never know where one point stops and where the next starts except it stands out that its just a dumb effing idea to just start randomly playing with your air fuel mixture when you dont even know what size injectors you are running i sorta agree that maybe one or more cylinders may not be getting spark but doubt that the tech who posted this didn't check such an obvious solution when he went so far as to check whether said unknown injectors were even getting a signal or not please learn to use a freaking period every now and then you probably also shouldn't post in general until you get that sr20 240sx so you can be a cool drifting mofo like in the movies

[verSat1l3]

You absolutely sure its all fuel and there isn't a crack in the head combined with it running rich? It would account for the smell of fuel and the presence of liquid in the form of areosolized coolant. It would also explain why you can't get a boost higher than 1-2 lbs because it would all leak out.

I think in this case I'd be paying more attention to why a turbo can't pressurize the system any higher because that sure sounds like theres a major leak somewhere. Check that the intake manifold is properly sealed to the the head and that the head is not cracked anywhere. I'm not saying boost it to 13 lbs as a test or anything, but with different manifolds and different turbos you should at least be able to put more air in there than that... Once you track down sealing the intake and compression chamber, then you should be better suited to diagnose the fuel spitting problem.

Or you could drill and tap the pipe for a sparkplug and put it out on the monster truck circuit... SUNDAY! SUNDAY! SUNDAY! SEE the FLAME BREATHING RICER!