little problem i need some help pleaseeeeeeeee!!!!!!!!!!!!!!!

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whatvtec
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Car: 91 240sx

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ok here is the problem the i finaly did my transmission swap and everything is in and wireing is done. car runs like s***. first gear wont go pass 20mph, 4000rpm, 2 gear wont go pass 35mph,also no more then 4000rpm, and so on my reverse lights dont work and when am getting to a stop sign and put it in neutral the car shuts off. some time the take off is even slower it goes like 5mph untill the rpm start to go up, also every now and then i get a loud backfire sounds can any one help please u can email me to [email protected] or aim sincere2883 please i need to have this car running thank u guys

car 91 s13things i done so farnew fuel pumpnew fuel filternew water pumpnew thermostatnew alternatornew spark plugs and wiresnew distributer capand 5 speed swap

and i check all this things before i posted this.also i checked injectors and they are working fine

idle goes up and down but almost not even noticeable

sorry for the long post but last thing i took it to a performance shop that works mostly on vw's but i seen some 240's there, they said it sounds like fuel problem, that don't seam right to me.


liquid_cool
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Car: 1990 Nissan 240SX KA24DE-T swap 8.6:1cr, duelsprings, ti retainers,supertech pistons, K1 H-beems balanced internals ect ect

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did you only do a transmission swapp when this began to happen to you?...or did you have all the other work done before initial start up?

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whatvtec
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liquid_cool wrote:did you only do a transmission swapp when this began to happen to you?...or did you have all the other work done before initial start up?
no all the stuff is just stuff i did so far motor wize but while i did the transmission swap i did the water pump, thermostat, becuase my engine would overheat alot, turned out it was a huge air bubble inside the cooling system, but thats fixed now, and also the alternator cus the original one just died.

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A2V
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When the engine backfires does the sound comes from the tail pipe?

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whatvtec
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yea but its verrry rare for it to happen so far it has dine it 2 or 3 times they sound very short but loud like a gun shot.

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whatvtec
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bump any one that could help me? i look under the car and i just saw the speed sensor alittle hit could that be the problem? could i use the speed sensor from the automatic to test it out?

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Z-tune!
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did you do an aftermarket higher flow fuel pump? if so, you might need an adjustable regulator. otherwise, you're flooding your engine with too much fuel, and could explain the running condition and shutting off. also, check your maf, maf wiring or make sure its plugged in. it sounds like it's either in limp mode or dumping too much fuel. lastly.. i dont know too much on this part of it, but are you sure youre using the right ecu? that could explain alot of things all at once

by 'transmission swap' i was assuming a/t to m/t. correct me if i'm wrong

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locoluna825
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sounds like exactly what my car was just doing last week, mine also acted up pretty bad after the manual swap. was always there but barley noticeable just got worse after the swap, i had an injector leak i changed the seals thinking it would fix it NOPE made it worse. Fuel started leaking out of the body of the injector real bad, ended up buying a set of remanufactured injectors for 100 bucks and they got a 5 year 80,000 mile warranty. fixed it just 2 days ago but the idle was still bouncing like yours and almost dying when i pressed the clutch in. That is until the engine light cleared, then it was all better runs beautiful now.
Modified by locoluna825 at 4:44 PM 8/10/2009

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locoluna825
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oh and the speed sensor being would not make the car do that

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whatvtec
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Z-tune! wrote:did you do an aftermarket higher flow fuel pump? if so, you might need an adjustable regulator. otherwise, you're flooding your engine with too much fuel, and could explain the running condition and shutting off. also, check your maf, maf wiring or make sure its plugged in. it sounds like it's either in limp mode or dumping too much fuel. lastly.. i dont know too much on this part of it, but are you sure youre using the right ecu? that could explain alot of things all at once

by 'transmission swap' i was assuming a/t to m/t. correct me if i'm wrong
i actualy just got a stop fuel pump, but now that u mention it i notice i am burning alot of gas, i put half tank of gas 2 days ago and now am almost at empty and i only go from work to home 10 minutes away. and i am also using stock ecu the auto one since i read that it makes no difference but i did manage to get the reverse lights to work now it was just bad wireing.

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whatvtec
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locoluna825 wrote:sounds like exactly what my car was just doing last week, mine also acted up pretty bad after the manual swap. was always there but barley noticeable just got worse after the swap, i had an injector leak i changed the seals thinking it would fix it NOPE made it worse. Fuel started leaking out of the body of the injector real bad, ended up buying a set of remanufactured injectors for 100 bucks and they got a 5 year 80,000 mile warranty. fixed it just 2 days ago but the idle was still bouncing like yours and almost dying when i pressed the clutch in. That is until the engine light cleared, then it was all better runs beautiful now.

Modified by locoluna825 at 4:44 PM 8/10/2009
i do have some other injectors that i have i will try it out but i actualy don't have no engine light on.

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Z-tune!
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all you have left is a fuel problem then. you either need it tuned or you need an adjustable fpr.

with the 4k rev limit.. it sounds like its a problem with wiring or the ecu. an a/t ecu is going to try to tell your manual transmission to shift. i'd go over all of the wiring and look at a few writeups that everything was done accurately. specifically the gear selector

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whatvtec
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update!! on my way to work i try pushing it a bit and at 4k rpm its where it slows down but i pushed it and and slowly veryyyyy slow the rpms go up i made it to 6k rpm and it seem like it would go higher but the engine sounded louder it could also have been the intake that sounded loud not sure. and as far as the ecu i actualy tested the car with another auto ecu and nothing changed.

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locoluna825
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its his fuel system you cant wire the manual trans to the auto ecu you just leave it unplugged at the fuse box as a matter of fact don't even try wiring anything else but the speed sensor and reverse lights, and the neutral safety switch jumper.

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whatvtec
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locoluna825 wrote:its his fuel system you cant wire the manual trans to the auto ecu you just leave it unplugged at the fuse box as a matter of fact don't even try wiring anything else but the speed sensor and reverse lights, and the neutral safety switch jumper.
i only wired the reverse light witch now work and the to wires that are jumped to make the car start. thats it.

another update!!! as i was driving home the car shut off again when i put it on neutral and it would not start so i crank it and nothing so i start pumping the accelarator and the car turns on that lead me to believe that the car is not getting enogh fuel i am assuming. i let go of the gas pedal and the car shut off so i did it again and the car turn on but it would not rev pas 1k rpm so i held the gas pedal for like 5 seconds untill it reved normal and the car started to drive again.

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Azrial
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You could have got a bad fuel pump. Sometimes these things happen.

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whatvtec
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Azrial wrote:You could have got a bad fuel pump. Sometimes these things happen.
the car was running excelect after the fuel pump, problem occurd after the transmission swap, i am alittle mechanicly incline so for me its usualy easy to tell what a problem is but this one its realy got me. i have checked almost everything from fuel to electrical and can't seem to find anything, i still have to change the injectors i will be doing this weekend just trying to see if i left something out so i can also work on it on the weekend.

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whatvtec
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changed injectors problem still there i notice today that when i floor it the car bearly moves and rpm go up slowwwwwwwwwwwly but if i gradualy tap it the rpm goes all the way to redline n e more guesses?

liquid_cool
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Car: 1990 Nissan 240SX KA24DE-T swap 8.6:1cr, duelsprings, ti retainers,supertech pistons, K1 H-beems balanced internals ect ect

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have you tested your Maf and TPS?..if not do that..this could be an issue with those 2 or one of the two...what breally is bothering me thou..is your using the auto ecu and harness...you should do a full swapp and locate a harness and ecu aswell..this will eliminate allot of head aches later on if ya decide to go ka-T in my opinion..let us know updates.

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whatvtec
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liquid_cool wrote:have you tested your Maf and TPS?..if not do that..this could be an issue with those 2 or one of the two...what breally is bothering me thou..is your using the auto ecu and harness...you should do a full swapp and locate a harness and ecu aswell..this will eliminate allot of head aches later on if ya decide to go ka-T in my opinion..let us know updates.
i actualy changed 3 different maf's and the car still the same but now that u mention it i have not even tought about the TPS i will do that today, and yea i do plan to change everything i am just working out the kinks on this car first becuase the previous dushbag owner did not know s*** about this car and said he was gonna put a supra engine on it lol wired everything with masking tape instead of electrical tape, but so far all that stuff is fixed already. i will let u guys know the outcome of the TPS. thank you.

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whatvtec
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GREAT UPDATE!!!!!!

ok after changing the MAF, the injectors, and the TPS with absolutly no result i asked a shop that only works on hondas(what are the odds lol) and they told me is something electrical like the distributer, so after changing back and forth the distributer it turned out so simple that i caveman could do it lol it turned out to be THE TIMMING, I could not believe it, now the car runs strong, thank you every one for taking your time to help me.

liquid_cool
Posts: 1700
Joined: Sat Jul 05, 2008 3:02 am
Car: 1990 Nissan 240SX KA24DE-T swap 8.6:1cr, duelsprings, ti retainers,supertech pistons, K1 H-beems balanced internals ect ect

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np man..most of us are glad to give some time here..and we hope (now that you have gone throu hell) you will allso lend a hand and participate in a constructive way on the nicco forums..

Devided, we are defeated;united , we are invincable!


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