Swap Problems

ONLY for ADVANCED technical discussion about the 240sx!
95 SR 240
Posts: 12
Joined: Sat Feb 17, 2007 4:45 pm
Car: 95 240sx

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First let me start by saying NEVER BUY A MOTOR FROM JSA MOTORS. No MAF sensor, wrong alternator, and modified parts (when the package was supposed to be a "complete" swap) but anyway the motor is installed as of today and i am having some trouble starting it. The wiring harness was professionally prepared by Enjuku Racing so I don't think that it is a wiring problem, but the engine won't spark, and from the looks of it no gas is reaching the pistons.

We know there is pressure in the gas lines aka. the fuel pump should be ok

We did the old fashioned test by taking out the plug while we tried to start the engine. Nothing. Thats how we saw that the piston was dry. Any help would be greatly appreciated (I haven't had my car in 7 months.) Thank You!


180fan
Posts: 7799
Joined: Sat Dec 14, 2002 12:16 pm
Car: 89 fastback

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did you take it up with them about the missing parts?

ecu ok? if there is no spark and no gas, it could be the ecu if the harness is ok.

95 SR 240
Posts: 12
Joined: Sat Feb 17, 2007 4:45 pm
Car: 95 240sx

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yeah, thats what i was thinking, but i didn't know if there was any way to test and see if it was the ECU or not, well except for finding another s14 and putting the ecu in it and see if it runs or not. is there anything else i can do?

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BurnsAuto90
Posts: 136
Joined: Fri Jun 17, 2005 6:00 am
Car: 1990 240sx
1991 240sx

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can you hear the fuel pump kick on when you have the key in the on position?

plug in a noid light and turn the engine over, to see if a signal is getting to the injectors. if they are getting a signal, the next thing you'll wanna check is the injectors themselves. if they aren't, double check all the wiring. enjuku's work is really good...just make sure. if everything on that checks out...sounds like you're ecu.

95 SR 240
Posts: 12
Joined: Sat Feb 17, 2007 4:45 pm
Car: 95 240sx

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yeah, the fuel pump kicks on, we accidentally had the fuel lines crossed, so we switched them, and there was pressure in the line. But, even after we fixed that obvious error the injectors still won't come on, the spark is still dead too.

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BurnsAuto90
Posts: 136
Joined: Fri Jun 17, 2005 6:00 am
Car: 1990 240sx
1991 240sx

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95 SR 240 wrote:yeah, the fuel pump kicks on, we accidentally had the fuel lines crossed, so we switched them, and there was pressure in the line. But, even after we fixed that obvious error the injectors still won't come on, the spark is still dead too.
try that noid light idea i told you about. (tell me if you dont know what a noid light is.) ask any local auto parts store if they have them, they're like 20 bucks (give or take) usually. if the noid light flashes when you crank the engine over, the injectors are getting a signal, and the injectors are the problem..or maybe someting is wrong with the fuel rail (but there's a lesser chance of that being the problem.). if no flashing when you crank the engine, its either the harness or the ecu. We know the ecu is getting power because the pump is kicking on. when you turn the key, the pump should kick on for three seconds, after that, if the crank doesnt move, the ecu turns off the pump until you go to turn the engine over.

dkdeleon68
Posts: 203
Joined: Sun Oct 10, 2004 5:23 pm
Car: 1991 240

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Have you checked all your grounding wire? When I did my swap i had forgotten to tighten down the grounding wire to the motor due to being rushed to finish ans it was acting the same as your's is now, then I tightened it up and bamm it started.

95 SR 240
Posts: 12
Joined: Sat Feb 17, 2007 4:45 pm
Car: 95 240sx

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I tried to check all of the grounds, and i found one that is connected to the back of the block, and it has a black plug on the end of it, but I can't find anywhere to connect it..could that be causing my problem?

There wasn't a light when i used the noid light. Nothing.

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BurnsAuto90
Posts: 136
Joined: Fri Jun 17, 2005 6:00 am
Car: 1990 240sx
1991 240sx

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95 SR 240 wrote:I tried to check all of the grounds, and i found one that is connected to the back of the block, and it has a black plug on the end of it, but I can't find anywhere to connect it..could that be causing my problem?

There wasn't a light when i used the noid light. Nothing.
can you post a pic of the plug you cant find a place for? take a look at the rest of the harness, make sure EVERYTHING is hooked up. i'd hate to see you get a new ecu when all it is, is a simple wiring problem.

95 SR 240
Posts: 12
Joined: Sat Feb 17, 2007 4:45 pm
Car: 95 240sx

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I found where that ground went. I don't have the AC used, but all of the stuff is still connected, could that be a problem? I looked all over today for the problem, and i couldn't fix it.

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BurnsAuto90
Posts: 136
Joined: Fri Jun 17, 2005 6:00 am
Car: 1990 240sx
1991 240sx

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95 SR 240 wrote:I found where that ground went. I don't have the AC used, but all of the stuff is still connected, could that be a problem? I looked all over today for the problem, and i couldn't fix it.
ac wouldnt have anything to do with it. sounds like you're ecu is garbage....

95 SR 240
Posts: 12
Joined: Sat Feb 17, 2007 4:45 pm
Car: 95 240sx

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ok, i have an update. i fixed the spark issue, and the timing was off but its still not getting any fuel. Someone told me that there is a possibility that the injectors are seized, and that i should just soak them in gasoline.

95 SR 240
Posts: 12
Joined: Sat Feb 17, 2007 4:45 pm
Car: 95 240sx

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I am starting to think that it is the ECU, because I have NISMO injectors (that shouldn't be seized) and i know that fuel is getting TO the rail, so it could be the FPR, but that probably wouldn't be messed up enough to totally prevent it from firing.


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