rb25det wont crank...need help

[breaker_bo1]

can anyone help me with my 240sx swap rb25det; when I try to crank it, all I hear is some relays clicking and a buzzing sound, can you help me with it, and on the stock 240sx coil (number 1 on the picture 1, which is the stock 240sx coil) I dont know were it goes, and number 2 on picture number 1 is a plug that I dont know where it goes, and on picture number 2, I dont know where the plug goes, and the other pictures are just pictures of my motor in my 92 240sx.

Picture 1: http://img329.imageshack.us/img329/4233/19na.jpgPicture 2: http://img329.imageshack.us/img329/513/26bo.jpgengine1: http://img329.imageshack.us/im...r.jpgexhuast_side: http://img364.imageshack.us/im...u.jpgIntake side: http://img329.imageshack.us/im...t.jpgTop of motor : http://img364.imageshack.us/im...y.jpg

and also does anybody know what starter interchanges with an rb25det or where I can get one

[Darius]

What method did you use to wire your motor up? It sounds like what mine did when I didn't have my ECU grounds connected. Heard the relays clicking on and off and the slight buzzing sound and everything.

[breaker_bo1]

I sent it to motorsportstudios.com in NY to do my wiring, I have all the grounds on the motor grounded, which all of them are located at the intake side, are there any at the exhuast side, and which ones are you talking about?

[Kansei240sx]

Did you do the lower engine harness wiring?

IE. wire up the starter/alternator and have it getting power?

[USMCgetsome]

there is one spade connector that goes on the top of the starter. THat is the ignition signal that will make the starter turn. Also power and ground from the battery and chasis ground.

[JonPowell]

can anyone help me with my 240sx swap rb25det; when I try to crank it, all I hear is some relays clicking and a buzzing sound, can you help me with it, and on the stock 240sx coil (number 1 on the picture 1, which is the stock 240sx coil) I dont know were it goes, and number 2 on picture number 1 is a plug that I dont know where it goes, and on picture number 2, I dont know where the plug goes, and the other pictures are just pictures of my motor in my 92 240sx.

Picture 1: Unless you are using the stock ka distributor, you need to lose this baby.Picture 2: This appears to be the plug that feeds power to the starter, remeber when I told you to make sure its all 100% correct before sending it back & to ensure your battery is fully charged? You didnt share with me the part about the relays clicking, you could have a low battery!!!engine1: I hope this pic is just to show off, cause the wires draped across the eshaust will melt real quick! That kink in the radiator hose dont look too good either.Intake side: fuel pump fuse should be a 10 amp, not 15Top of motor : make sure there is no vacuum lines left open, it will cause starting/idle problems if there is a vacuum leak!!! Why is there oil on top of the coil cover?and also does anybody know what starter interchanges with an rb25det or where I can get one

Just send yours in for rebuild

[breaker_bo1]

On picture number 1, I eliminated the coil, but where does the plugs go to?, and on picutre number 2, the plug wont plug into anything else because the starter dont have plug like that, I already got the starter plug up right, with power, ignition, and ground(which the starter grounds itself).

[JonPowell]

Plug goes to the coil, now it goes to nothing.

What wires are in that other plug in pic 2?

[Darius]

Pic #2 looks like the plug that goes to the alternator. Also, what does the electric fan plug look like on an S13? I know the S14 has a 4-wire, square grey plug for the fan in that location, but don't know about the S13.

[breaker_bo1]

Ive already have my alternater pluged, since the other 2 plugs that goes to the stock 240sx coil on pic # 1 goes to nothing anymore, the only plug left is the one on pic #2

[JonPowell]

Ive already have my alternater pluged, since the other 2 plugs that goes to the stock 240sx coil on pic # 1 goes to nothing anymore, the only plug left is the one on pic #2

What color are the wires in that plug?

[breaker_bo1]

One is yellow/red and the other is white and green or yellow and green

[David_NISMO]

Caution: Ghetto Rigging Ahead

If you don't have the intercooler piping and want to start the engine, you can duck tape the MAF to the Intake Manifold Pipe, and whalla, N/A RB25.

[300Plus]

do you have the MAF plug pushed in all the way? I tried testing my spark the other day and it didnt work until I plugged in the MAF.

It looks like there are a lot of little things like someone stated oil on coil cover, vacum leaks, wrong fuses?

**EDITED** If Jon wired it, it is good!!
Modified by 300Plus at 6:02 AM 4/11/2006

[JonPowell]

I told him that I would be MORE THAN HAPPY to check the harness out again. I told him to just make sure 100% that he has his car put back together 100% correctly first because if the harness checks out good and its some error on his part, then he would be liable for all shipping costs plus paying me for my time.

I guarantee my work 100% including anything that is messed up from my work. If I wire the harness wrong and it causes any damage, I will cover it, on the condition that I get first dibs at looking at the harness. If you open it up yourself to "See what went wrong" or "Try to make it work" then the error is all on you. If the harness is 100% in the same condition it was when I sent it to you, then I will 100% cover it...as long as its some error on my part. I will not go on wild goose chases for free to re-verify a harness because someone tries to start their car with half the intake off it and half the dash apart.

He needs to verify that his car is put back together 100% ready to run and that it wont run before I feel confident telling him to send it back. I just want to try to save him a little cash. I check EVERY HARNESS I CONVERT with a 13.8V Power converter and a bunch of 12V lamps. I verify it with my ECU & CAS. I sold him his ECU from a car I know was running so I know THAT is good also.

I dont want to get the harness back & spend 1 hour setting up the harness, rechecking everything & have it come up ok, then fight with him over shipping costs & my labor...all the while holding his harness hostage. That isnt very good....so we are here today troubleshooting his setup.

[Carl H]

i wanna know why you are trying to crank it when the engine isnt even fully installed....

[breaker_bo1]

I got my MAF sensor pluged in all tha way, the oil on coil cover came from when I was putting oil in my motor, and about that fuel pump fuse when JonPowell said "fuel pump fuse should be a 10 amp, not 15", i dont know if he's right or not, but on my fuse cover it says that there should be a 15 amp fuse in it.

[breaker_bo1]

im not trying to say its your fault, blaming you because my motor wont start, Im just trying to say that I did something wrong and need help, plus it might be my starter, because I tooked it off and check it at the local autozone and myself, and it doesn't work at all

[JonPowell]

I stand corrected on the fuel pump fuse....Every S13 I have worked on said 10A for that location....I apologize.

I dont think you are blaming me, I just want to be clear to everyone how I work. Whenever there is a chance I did something wrong, I like to be involved in the cure. Either way I want to help you get your motor running. I hate when stuff doesnt work out. I always give advice to people and I am more than willing to do the same to you, but we gotta go through it all methodically. Whenever my name comes up I want people to think good things, not "Well there was that one time" so I make sure I attempt to help out.

If your starter is bad, send it out to get rebuilt. Its not that expensive and you will know its good, instead of chancing a used unit.

[USMCgetsome]

follow jon's advice. Charge the battery fully. That would give you the funny clicking noise. Also, Send the damn harness back into jon so he can check it out. He is the best when it comes to this situation. Start from there and then work backwards.

[David_NISMO]

So, is the motor even turning over, at all? If it's not, then it's a power supply issue, not a technical wiring problem.

Does the engine have a substantial ground source directly to the battery?Have you cleaned the posts on the starter?Are you confident in the Starter's positve wire and connectors?

You could always "hot wire" the starter from another power source by applying power directly to the starter post. Just make sure you ground the alternate source to your chassis.

Secondly,If the motor is in the condition it is in now, no intake piping, why does it matter if the maf is even plugged in? I can start my motor without the MAFs plugged in. Some sort of safety mode, so you can limp your car home. But..., if his MAF is plugged in, but NO air is moving through it, would it still start?

[breaker_bo1]

Ok!, now I got the motor to crank, but it wont catch on, I had someone check the sparks me, and they said that there wasn't enough spark, what could I do to make the sparks stronger so that the motor would catch on?

[Valley]

are you plugs fouled? did you replace them with the swap (when i did on my swap the ones i pulled out, you couldn't see a bit of shiny metal)? and are you 100% sure you're geting fuel?

if the motor is in the condition it is in now, no intake piping, why does it matter if the maf is even plugged in? I can start my motor without the MAFs plugged in. Some sort of safety mode, so you can limp your car home. But..., if his MAF is plugged in, but NO air is moving through it, would it still start?

yes.

[breaker_bo1]

Im 110% sure that im getting fuel, im getting spark too, but a weak spark

[Valley]

is it even trying to turn over?

cam tooth skipped a gear?

[breaker_bo1]

yes, it is trying to turn over, what could I do to get more spark?

[Valley]

oh. i know how to do this one. get a friend or hook up your trottle cable. modulate the thottle as you crank it.

at the same step you're at mine did the same exact thing. it won't start up properly until you have the intake system on WITH a filter (without it'll idle high as hell and be hard to start still).

your spark is fine. your car is fine. put the intake system together.

[Darius]

Is your motor simply turning over or is it actually firing while turning over? In other "words", is it going rananananana or is it going ranana-bew-nana-bew-bew etc...? God I feel like an idiot posting that.

[David_NISMO]

that is some of the best engine onomatopoeia I've heard. LOL ha ha ha ha. Good stuff.

Hooking up your intake plumbing, or just taping the MAF to the intake mani will help you a lot. If you have weak spark, then your a/f better be dead on.

I had 6 weeks of trouble shooting once I got my motor started. After about 3 weeks, the motor wouldn't start anymore. The plugs had fouled out from improper a/f ratios. So make sure you atleast clean them periodically until you get it running well.

[breaker_bo1]

its..going ranana-bew-nana-bew-bew...haha...