in need of an rb guru or electrical guru

[nismo240sxkat]

hi need some help here

i just finish with my rb20det swap and i have one problem here it is.
My engine turns over but does not start unless u spray started fluid.
i did not build my own harness i bought a wiring specialist harness to be easier.

what i have check and know i have chek

1. i have spark
2. i have fuel to the rail
3. i have constant 12v to the connector on the injector
4 i have check all the grounds but cant seem to find a lose one
5. the spark plugs are not wet

my problem is from what i have trouble shoot is that the injectors dont pulse? causing no fuel in the chamber

i have done some research but came up ecu, cas or ground. I check the ecu for codes and have 55 code witch is clear so guessing the cas is also good.

any suggestions on where i can go from here ?????

[Javi802]

Maybe your fuel pressure regulator is bad?

[dbeiler]

Fuel lines swapped? Post a pic of your fuel lines.

[Scott@FontanaNissan]

i vote CAS or reversed fuel lines as well. unless your engine jumped timing or broke a t-belt

[nismo240sxkat]

Originally Posted by Scott@FontanaNissan

i vote CAS or reversed fuel lines as well. unless your engine jumped timing or broke a t-belt

I'll post a pic when I get home but I have the filter to the back of the rail return to the front of the rail. This rb20 has 2 fpr by the way idk y. If the cas was bad would I have no spark at all? And timel is good when I spray started fluid starts good for a bit and turns of but I'll check with my timing light .

[Scott@FontanaNissan]

Originally Posted by nismo240sxkat

I'll post a pic when I get home but I have the filter to the back of the rail return to the front of the rail. This rb20 has 2 fpr by the way idk y. If the cas was bad would I have no spark at all? And timel is good when I spray started fluid starts good for a bit and turns of but I'll check with my timing light .

if you spray carb cleaner and it starts for a second it's 100% fuel related, so either lines are on backwards, fuel pump isn't coming on, or the injectors are stuck shut.

[Javi802]

can you hear the pump prime?

[nismo240sxkat]

Originally Posted by Javi802

can you hear the pump prime?

Yea pump primes I'm having problems at the injectors not pulsing

[Yellow4g63]

Originally Posted by nismo240sxkat

hi need some help here

i just finish with my rb20det swap and i have one problem here it is.
My engine turns over but does not start unless u spray started fluid.
i did not build my own harness i bought a wiring specialist harness to be easier.

what i have check and know i have chek

1. i have spark
2. i have fuel to the rail
3. i have constant 12v to the connector on the injector
4 i have check all the grounds but cant seem to find a lose one
5. the spark plugs are not wet

my problem is from what i have trouble shoot is that the injectors dont pulse? causing no fuel in the chamber

i have done some research but came up ecu, cas or ground. I check the ecu for codes and have 55 code witch is clear so guessing the cas is also good.

any suggestions on where i can go from here ?????

The factory harness uses 2 relays near the ecu. one is for ignition and the other fuel injection. Since you have aftermarket harness email them and find out if your missing a power to something.

Did you try and take out the CAS and spin it by hand to see if the injectors are clicking and coil packs are firing?

[nismo240sxkat]

Originally Posted by Yellow4g63

The factory harness uses 2 relays near the ecu. one is for ignition and the other fuel injection. Since you have aftermarket harness email them and find out if your missing a power to something.

Did you try and take out the CAS and spin it by hand to see if the injectors are clicking and coil packs are firing?

There is 2 relays that come with the harness I'm not sure if that's what u talking about but I'll call them anyways.

No I didn't try to take it off and spin it by hand since I have spark to the coil and the motor is turning over

[Yellow4g63]

Take out the cas and give it a spin and see if you hear the injectors click, the coil packs will fire too but you said you know that's working so just listen for the injectors clicking.

[91ka24]

Check your dash plug. There will be a orange wire that runs from up under the glove box to the ecu. That orange wire is for your injectors to batch fire while cranking. If that wire isn't getting 12v while cranking you will experience the problem you are having

[nismo240sxkat]

Originally Posted by 91ka24

Check your dash plug. There will be a orange wire that runs from up under the glove box to the ecu. That orange wire is for your injectors to batch fire while cranking. If that wire isn't getting 12v while cranking you will experience the problem you are having

Thanks ima check this wire and the cas today thanks again guys for helping out

[nismo240sxkat]

hey guys just want to share that i found the problem with motor i did a noid test to check for a signal to the injector to the ecu and i had a signal . Note i had fuel i had spark only thing that was missing was fuel in the cylinders . The problem was the injectors were not clicking (pulsing)i took off the fuel rail and they were all full of gunk. Got them clean a little and clicking. Having one of my buddies that works at injectorclinic take them to clean them out .
Just wanted to share in case anyone else has the same problem and anyone doing a swap with a motor sitting for a long time to clean ur injector out .

thanks for the help

[Yellow4g63]

good deal.

[Scott@FontanaNissan]

called it, good stuff man. glad you got her running.