s14 rb25det wont start no spark

[510_rb25det]

ecu is good just checked ignitor is good cas is good new coil packs new spark plugs but still no spark

[510_rb25det]

plz help me out its in 95 240sx rb25det s1

[Darius]

Do you have power to the ignitor? i.e. Is the relay switching over to power up the thicker white wire?

[510_rb25det]

well bro i have power to the coils . and how would i check power to the ignitori checked all my fuses all good

[Darius]

This is a dumb question but is the wire grounded to the bolt on the last cool pack bracket? If coils still don't fire, check that the cas circuit and hardware.

[510_rb25det]

This is a dumb question but is the wire grounded to the bolt on the last cool pack bracket? If coils still don't fire, check that the cas circuit and hardware.

ya bro the wire is grounded .i canged the cas and the injector are clicking so i think it workingwhat should i do next

[rb25det250sx]

are you sure its not getting spark? did you check? Check the wires for continuity.

[510_rb25det]

are you sure its not getting spark? did you check? Check the wires for continuity.

ya i looked for spark like million times still no spark what wires should i check for continuity

[Darius]

Do you have power to the ignitor?

Sorry I meant power to the coils.

So you have power to the coils via the thick white wire, the coils are adequately grounded by the black wire at the rear of the head, but no sparks are coming from your plugs, correct?

There are only 4 options then:

1) There is no continuity between the 6 coil signal wires between the coils and ECU. I find it hard to believe that all 6 would be discontinuous.2) The power wire is shorting out to the ground wire in the coil pack harness. (This b**** of a problem left me stranded and scratching my head for a few hours)3) The ECU coil drivers are burnt up. Open up the ECU and look for burnt areas. 4) There's always the chance that the ignitor is not grounded properly (or is bad). If I remember right, the ground is the B/Y wire that runs to the bolts on the front of the intake manifold.

[510_rb25det]

Sorry I meant power to the coils.

So you have power to the coils via the thick white wire, the coils are adequately grounded by the black wire at the rear of the head, but no sparks are coming from your plugs, correct?

There are only 4 options then:

1) There is no continuity between the 6 coil signal wires between the coils and ECU. I find it hard to believe that all 6 would be discontinuous.2) The power wire is shorting out to the ground wire in the coil pack harness. (This b**** of a problem left me stranded and scratching my head for a few hours)3) The ECU coil drivers are burnt up. Open up the ECU and look for burnt areas. 4) There's always the chance that the ignitor is not grounded properly (or is bad). If I remember right, the ground is the B/Y wire that runs to the bolts on the front of the intake manifold.

1.there is continuity if i check between 7 plug on ignitor to ground on black wire pin 4 .. 2. well i tired 2 harness same s*** 3. we checked my ecu on my buddys car n it sparks 4 i checked it is grounded

i did everything possible thing that need to be dun .. n still no spark

if anyone can explain over the phone 559 2104964 andy plz help me out

[Darius]

WTF?

Have your buddy try to start it while you monitor the voltage to the coils (white wire). Does it stay at 12+V

[510_rb25det]

got spark now wont fire up just heared a big pop n after there nothing

[Darius]

What kind of pop? A pop out of the exhaust or a pop out of an electrical unit?

[510_rb25det]

sounded like exhaust pop

[Darius]

Have you pulled the plugs again and rested them on the valve cover while trying to start (w/ fuel injector harness unplugged) to see if you are still getting spark to all of them?

[510_rb25det]

i got spark every time i unplug the injector harness n crank i hear it wanna start . i hear lil pops. if i plug the harness then i dont hear s*** . feel like no spark then .. idk y i fell either injector are not turning at the right time

[510_rb25det]

i got spark every time i unplug the injector harness n crank i hear it wanna start . i hear lil pops. if i plug the harness then i dont hear s*** . feel like no spark then .. idk y i fell either injector are not turning at the right time

please help me

[l0nestar]

use a noid-light, or test-light to verify each injector plug is sending signal to the injector to operate.

Did you verify the driver section of your ECU is not fried? No burnt spots on the board?

Silly question, is your CAS 180* out?

[Darius]

Do you have 12V power to the injector harness (gray wire)? Is this a Series 1 or Series 2 RB25?

[stevespeed]

did also check your relay's that you are using near the ECU?

I also had a similar problem once and it was a ground for my something that I had wired SUPER close to the ECU.

[Darius]

did also check your relay's that you are using near the ECU?

I also had a similar problem once and it was a ground for my something that I had wired SUPER close to the ECU.

I had that same thing happen to me too. That's why I asked him if he had power from the white wire to his coils. If that has 12V, then you know the IGN relay switched with the turn of the key.

If the coils have power and ground, they should be working especially if his coil harness and ECU works on another car. I'm beginning to doubt that it is simply spark related and possibly fuel or CAS related.

[510_rb25det]

I had that same thing happen to me too. That's why I asked him if he had power from the white wire to his coils. If that has 12V, then you know the IGN relay switched with the turn of the key.

If the coils have power and ground, they should be working especially if his coil harness and ECU works on another car. I'm beginning to doubt that it is simply spark related and possibly fuel or CAS related.

Thanks bro it was a alot of lil stuff . big thing was cas . i had 2 bad cas maf , plugs car run good now i m kinda happy with it

[kowboyrb26]

hey guys i got same problem. My rb26dett in s14 will not start. no spark. I am replying to darius, hey man you asked a question about ignition coil power (white wire) has to be 12v even when cranking. Mine is at 12v but as i crank voltage drops to 0. what could the problem be? I would really really appreciate help guys i am stomped big time. Thanks

[Darius]

When 12V goes to 0V when cranking, it is likely because the power is coming from a body module that is turned off while starting (like radio, etc.) The white wire receiving power from the IGN relay. Verify that the power to the wire opposite the white wire in the relay is getting switched battery power. (i.e. 12V power when the key is in both the ON and START positions.) If it is not, the relay is powered by an incorrect source.