240sx l28 to much gas

Post by **MoToG** » Sat Oct 31, 2009 6:45 pm

i have a l28 in my 240sx and for some reason its overloading with gas like so bad it pouring out of the manifold and i have no exhaust so thats like right ontop of my steering rack. it starts up for a second and then it dies, and it will keep doing that but the gas will be under the motor and then it will shot a flam which catches it on fire so im not gonna try it again untill its fixed. the motor ran when it was in my friends 280z, then we took it out and put a l28 turbo motor in his car. so im like why not have some fun and put it in my 240sx, things i changed b4 putting it in my car... i cleaned up the intake manifold took all the emissions crap off and all the other lil stuff not needed, changed spark plugs, and i think that was it, so im lost why its doing this, and 1 more thing i had a 255 fuel pump so i thought that was the problem so i got a stock l28 fuel pump from the junkyard still 2 much gas. so im thinking injectors??

Post by **evildky** » Sun Nov 01, 2009 5:49 am

the fuel pump shouldn't be an issue unless you have a restricted return fuel line, measure static fuel pressure, it should eb aroudn 38 psi, unless it's signiicantly higher the fuel pump isn't the problem

when you removed that "emissions crap" what all did you take off? and what year was the donor? the emissions changed a bit year to year, and if you took out idle air routing then you will run rich unless you get the air in by adjusting the tb

in removing the emissions did you ever have the distributr or plug wires off? have you checked the ignition timting? and verified you got the plug wires back in the right order? remember they go counterclockwise form #1

a bad or disconnected O2 sensor will cause a slight rich condition

a disconnected non functioning or shorted chts will cause way right condition to the point of flooding the engine, it's located on the lower thermostat housing, it's the one with 2 wires and looks liek an injector clip, sometimes people gatch the wiring under the valve cover and short the circuit

a bad or maladjusted afm can cause the car to be severly rich or lean depending on which way it it, a bad or non functioning afm does nto turn the fuel pump on but if you aren't runnign the l28 fuel pump relay you'd never know it

Post by **MoToG** » Sun Nov 01, 2009 9:57 am

well the motor is a 79-83 and the wiring and ecu is off a 75 i think, i dont really know much about these motors. well i basically blocked everything on the intake besides the startup injector. the motor didnt evan have a o2 sensor when it was on my friends car. the motor runs good when i spray starter fluid into the intake but runs out shortly so i turned the fuel pump on while it was running on the starter fluid and then it flooded out instantly. so im still pretty lost but ima go check the sensor u said by the coolant neck

Post by **evildky** » Sun Nov 01, 2009 7:32 pm

if it starts on starting fluid that indicates no fuel, is the fuel pump coming on? are the injectors clicking?

Post by **MoToG** » Mon Nov 02, 2009 6:45 am

trust me its getting fuel, so much that its leaking out of the bottom of the header and it floods the motor, im sorta scared now lol cuz it caught fire yesterday cuz it spit a flame and the was gas under the motor. but yeah the injectors are clicking im so lost

Post by **evildky** » Mon Nov 02, 2009 7:58 am

something doesn't add up, if the car starts ons tarting fluid that indicated no fuel, are you sure you don't have say a vad hg water fouling the plugs but not enough water to prevent the much mroe volitile starting fluid form igniting? also the amount of fuel injectod intot he einge per cycle is quite small, you'dd have to crank for a long long long time to get enough to actually come out the exhaust manifold, that or you have a completely failed injector in the open position but I've never seen that happen, try disconnecting the injectors hit ti with starting gluid and spray a bit mroe as it starts to die off, see if you still get liquid otu the exhaust manifold

Post by **MoToG** » Mon Nov 02, 2009 10:08 am

well i hooked the fuel pump up 2 a switch so what i ment is that in ran barely on starter fluid and then if i turn the fuel pump on while its barely running on starter fluid it will die out and start leaking gas out the header and if i try 2 keep starting it, it will spit a flame and catch on fire so idk... and ima just gonna hit up the junkyard and get some injectors when i can get around to it.

Post by **evildky** » Mon Nov 02, 2009 4:42 pm

it's not bad injectors

does the car or does it not fire up on starter fluid?

Post by **MoToG** » Tue Nov 03, 2009 11:27 am

fires up on starter fluid and then if i turn on the fuel pump it dies out and starts leaking fuel out the header so i think its injectors unless u think its something else

Post by **MoToG** » Tue Nov 03, 2009 11:29 am

MoToG wrote:fires up on starter fluid and then if i turn on the fuel pump it dies out and starts leaking fuel out the header so i think its injectors unless u think its something else

and also it start up with out the starter fluid, it just dies out really quick and start leaking gas out the header so idk what 2 think

Post by **evildky** » Tue Nov 03, 2009 12:16 pm

Post by **evildky** » Tue Nov 03, 2009 12:29 pm

and plug the fuel line going to the cold start injecotr, those work differently, that might be capable of failing open

Post by **MoToG** » Tue Nov 03, 2009 1:07 pm

yeah i got rid of the cold start injector, but the chts wasnt evan plugged in when it was in my friends car and it started up. thats the sensor by the back of the motor correct?

Post by **evildky** » Tue Nov 03, 2009 6:11 pm

if the engine ran fine in your frineds car with the chts unplugged somethign is seriously wrong! that should have been a warning sign of problems to come

there si no sensor ont he back of the L6, the chts is located oint he lower thermostat housing for all N42 and N47 heads as well as the P79 ( I won't swaer to in ont he P79) on the P90 (turbo motor) the chts is located ont he passanger side fo the head between the spark plugs for #5 and #6

so what head do you have?

Post by **MoToG** » Wed Nov 04, 2009 6:00 am

i want 2 say n42 but im not sure ima look at it 2day, but yeah the sensor between 5 and 6 on the passenger side is on my motor and was never pluged in when it was running in his car, but ill get back 2 you and thanks for your help

Post by **MoToG** » Wed Nov 04, 2009 6:04 am

ok well i looked at it and its the p79 head

DontCaere · Post by **DontCaere** » Wed Aug 08, 2018 1:12 pm

What did you do to make the l28 engine harness to fit the connector of the s13 where the ka24de harness should be.

Post by **amc49** » Wed Aug 08, 2018 2:42 pm

What utter blatant incompetence................the moment I hear a person say it didn't need this or that sensor I say get someone else working on the car. The sensors ALL are necessary except in slight controlled cases and overlooking that a person needs to have all the trouble he can handle as he is incompetent at working on cars. Mismatched ECM likely and no O2 sensor..........hilarious.

Keep it up, at some point enough fuel will build up to hydrolock the cylinder then it will all be over. Or burn the garage/house down.

Post by **Ace2cool** » Fri Aug 10, 2018 6:56 am

Lol, this is a 9 year old thread. He probably already burned the garage down.

Post by **amc49** » Fri Aug 10, 2018 8:29 pm

Well, I'm the dumb-ss there then...............I usually catch things like that. Probably the potential fire issue, I tend to zero in on things like that to bar others.

My bad fellas.

Post by **MikeRL411** » Sat Aug 11, 2018 12:02 am

A 240SX IS NOT A Z CAR !!!!!!!!!!!!!!!!!!!!!

240sx l28 to much gas

240sx l28 to much gas

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