95 s14 PLEASE HELP totally stumped

[240-slide-ride]

hi

i have a 95 s14 240sx. ka24de 110xxx miles. heres the story

my radiator sprung a leak, it was the original radiator and old so i replaced it, along with the waterpump thermostat and hoses. the car was parked for 1 week wile i was waiting for the new radiator to come. when it was parked the car ran perfect. a week later my radiator comes, so i go out to the car to start it and it fired up just fine, i let it idle for about 45 seconds before putting it in drive, the car moved two feet and then it just stalled this is when the problem began. i checked for spark and it was weak, so i went to the store and replaced the plugs and wires, the car finally started but i had to play with the gas to get it to fire, it was also backfiring out of the intake a little bit. when the car runs it stutters and is choppy (sounds like its like a subaru) it also backfires out of the tailpipe when revved. if you stab the gas it would just bog but if you eased on it was fine. since then i have replaced fuel pump, fuel filter, strainer, 02 sensor (exhaust mani 02) coolant temp sensor, plugs, plug wires, cap, rotor. it was pulling up a code 34 for the knock sensor, so i bypassed the sensor to eliminate that variable. since replacing all the parts the car runs better, but still s***ty. me and a friend messed with the distributor a little bit last night (spinning it) and the car seems to run like normal after 2000 rpm, but from 1k to about 2k rpm it sputters and runs like crap still. another thing is my cel will flash when im driving it, but when i check the codes i get code 55 all ok code, CAN ANYONE PLEASE HELP?????

btw i checked my timing chain and it felt tight i really dont think it skipped.

one more thing my dad moved my car out to the street right before all this happened, he left my passenger side window down and it rained a few times that week, do you think the ecu could have possibly got wet?? i opened it up today and the board appeared to be ok but idk, i did notice small spots of surface rust on the outside of the ecu

someone please help i have been trying to fix it for almost 3weeks now
Modified by 240-slide-ride at 1:05 PM 11/13/2009

[moso]

how did you bypass your knock sensor? if it was a bad knock sensor have you reset your ecu sence? my car did all these things, it was a leaking injector. after a day or two of messing with it i found i had a cyl full of gas.

[240-slide-ride]

i bypassed it by soldering in a 1m resistor in the white wire for the knock sensor then grounded it out on the chassis, what was leaking on your injector the o-ring?

[240-slide-ride]

and yeah i reset the ecu since bypassing it the code hasnt come back although my cel keeps flashing and there isnt a trouble code stored?!?

[moso]

yea it was an o ring, your cel keeps flashing and your not getting a code. that cant be good. sounds like your ecu may be freaking out. this is the writeup that i used when i bypassed my knock sensor (have a new one now) http://zhome.com/ZCMnL/PICS/de....html its a little different than your setup dunno if it makes a difference.

[240-slide-ride]

i have another set of injectors on the way so i hope that clears the problem but im kind of thinking this is more of a diffrent problem than injectors bc overall the car runs ok but it sputters like crazy on low end, like if you were to take off from a stoplight for example it would be sputtering like crazy until the rpm got high enough

[moso]

if it is leaking you can tell by just removing the fuel rail and keying on the ignition. if it is leaking than you would have too much gas at an idle but at WOT you would burn most of it off and it would run ok.

[i_need_an_s15]

did you check your timing at all? same thing happened to my 240 and all it took is me setting the timing to 20 degrees btdc

[240-slide-ride]

i havent looked at the timing itself just the chain, how did you go about setting the timing 20 degrees btdc??

thanks

[240-slide-ride]

update

so i messed with the cars distributor some more today, not much luck. i did notice that there was what appeared to be raw fuel coming out of the tail pipe while the car was idling, i pulled the plugs and they appeared like the car was running lean wtf???

[moso]

unbolt your fuel rail from the intake manifold. leave the lines attached, unbolt the hardlines from the intake as well. place a rag under the injectors and have a friend key on the ignition. i would bet one of your injectors is pissin out fuel.

[240-slide-ride]

unbolt your fuel rail from the intake manifold. leave the lines attached, unbolt the hardlines from the intake as well. place a rag under the injectors and have a friend key on the ignition. i would bet one of your injectors is pissin out fuel.

im kind of ruling that out bc all the plugs looked consistant one wasnt any darker than the other one they all looked LEAN, today i went out to start the car and it wouldnt even start the plugs were soaked in gas

[240-slide-ride]

bump anyone any ideas??

[motoman399]

while its running pull one injector wire then if that makes it run worse move on to the next. it still could be an injector. also double and triple check your plug wires are in the right spot. to me it sounds like you have the 2nd and 3rd plug wire in the opposite spots. GL

[240-slide-ride]

i tripple checked the wires and there all in the right spot although i was suspecting that too, all the wires are correct. i went out to the car to start it today and it wont even start plugs are soaked again. i also pulled the return line for the fuel and gas came so its flowing ok i assume

[sx moneypit]

Check your fuel pressure regulator and make sure the diaphragm is not blown.Pull the vacuum hose off and see if any fuel is leaking out. You can also use a vacuum pump to test it.Good luck!

[240-slide-ride]

i pulled the vacuum hose, no gas came out but i did smell a slight scent of gas on the hose i assume thats normal?

[sx moneypit]

Yeah , you will get a little smell out of it.

[240-slide-ride]

btw i went out to start it today with no luck tried 2 diff sets of plugs after the first pair was soaked, it would turn over but it wouldnt start just occasionally backfire out the intake

[sx moneypit]

I know you said you put a new ect sensor on your engine but if you have a scan tool hook it up and make sure your coolant temp is within specs.Also check your ecm ground circuits. You might even want to try a known good ecm on it.

[240-slide-ride]

ok like a multimeter to check voltages? also i have been wondering if my ecm was bad, were are the ground circuits located at? so far i cleaned to grounds one on the driver side of the motor and another by the throttle body area

[sx moneypit]

Check your power and grounds at the ecm connector . You will need a diagram of the pins on the ecm connector. Probe the power and grounds( do this with the ecm disconnected) make sure you are getting battery voltage. Some of the pins will only be hot with the key on , but your diagram will show you the ones that are. Be sure to disconnect the battery before you disconnect the ecm! Good luck!

[240-slide-ride]

i am going to look into the ecu a bit more tomorrow, i cleaned all my grounds and went over a few sensors with a digital multi meter today

i did find that my maf sensor voltage was a bit higher than specified, key on engine off it was telling me .5V but factory specification is .2V. i couldnt test it with the car running bc it wont start think that could be causing this?? i havent checked the ecu or tps yet tho

[240-slide-ride]

UPDATE

i got a loud buzzing noise coming from my engine bay somewhere i cant exactly pinpoint it but it will not start any suggestions? it comes on when the key is forward (key on engine off)

[sx moneypit]

It might be your ecm relay.Disconnect the ecm and see if it quits buzzing. Ecm shorted?

[Doya]

It might be your ecm relay.Disconnect the ecm and see if it quits buzzing. Ecm shorted?

Hey, I've been having a similar problem with a loud buzzing sound coming from where my ECU is at. When you said ECM( Electronic Control Module ) is that the same as a ECU.

[sx moneypit]

Yes sir.

[Doya]

Ok, well earlier you said it could be the relay, how do I check that.

[sx moneypit]

The ecm relay is just above the ecm.Try disconnecting the ecm and see what happens.

[Doya]

I went out and disconnected the ecm and the buzzing stopped, so does that mean it's the relay. I just got done with my ka-t and have been wanting to start this forever