RB20DET Not Starting

[nurvcom]

OK


Specs
91 240sx
Rb20det (stock)

Picked car up already swapped and it start a few times now it wont


All the motor will do is Crank crank crank crank and not start not even a sputter or anything

What i checked and fixxed when this started happening

1.Wire harness was all Messed up so i think i fixxed it

2. CAS was bad so replaced New Used one Tested and works on other Motor

3. ECU was good but got Another unit just in case Both ECU was checked and work perfect

4. Check all relays and fuses all bad was replaced

5. Check all Grounds on Motor and ECU and i added some more grounds

6. Check Fuel pump (255 walbro) primes and works perfect fuel PSI is OK

7. Coils and Injectors are working



you think it mite the key switch on steering column?

I cant Figure this out and driving me crazy

[nurvcom]

bump no one knows :


o and IGN chip was replaced

[240love]

vacumm leak?

[nurvcom]

Originally Posted by 240love

vacumm leak?

i checked all vacumm lines non are unhooked

[240love]

Originally Posted by nurvcom

i checked all vacumm lines non are unhooked

there could still be something leaking.. back when i had my rb20 it wouldnt start if it had the slightest leak

[flawlessflo3190]

ignitor grounded?

[nurvcom]

Originally Posted by flawlessflo3190

ignitor grounded?

i grounded the grounded the wire do i need to ground the ignitor case to something?

[240sxxs]

what about fuel problem.

[nurvcom]

Originally Posted by 240sxxs

what about fuel problem.

me and my friend check fuel pump it working perfect and fuel filter is clean and not clogged


No on the fuel line going to the motor

Top line on intake on RB20DET Feed
and
Bottem Line on intake on RB20DET is Return


Correct?

[240love]

did you ever disconnect the fuel lines? if you did make sure you put them back correct cause that shit happens all the time lol

[nurvcom]

ok i check fuel lines today

[nurvcom]

ok check fuel line It hook up right still not starting Took A compression test
Front 6 130psi
Front 5 130psi
Mid 4 130psi
Mid 3 130psi
Rear 2 140psi
Rear 1 140psi

ok
Pulled coils and checked them agine
each coil fires fine
and
injectors working fine cuss it floods after 5 or 6 time trying to start it
Half Mood (F#$King) Key Broke off cam so now it kinda hard to reinstall cas
and it still not starting

well I think i going to fuxking give up it not whatting to work and i put so much into now i am pissed

[Zacho]

Originally Posted by nurvcom

ok check fuel line It hook up right still not starting Took A compression test
Front 6 130psi
Front 5 130psi
Mid 4 130psi
Mid 3 130psi
Rear 2 140psi
Rear 1 140psi

Half Mood (F#$King) Key Broke off cam so now it kinda hard to reinstall cas
and it still not starting

am I the only one here who thinks with a broken half moon on his cam, now its not rotating the CAS and therefore, no dice?

[greenwood]

Originally Posted by Zacho

am I the only one here who thinks with a broken half moon on his cam, now its not rotating the CAS and therefore, no dice?

It will still rotate and work fine if you are sure to install it correctly. I had 2 Cas's go bad on me, shaft broke because bracket for cas was slightly bent. Car would still get spark but not enough to fire, but just enough to make me believe the cas was ok. Make sure that this is not the issue.

[soon2bs13]

you have not checked the battery or starter yet?

mine was giving me issues as well. check the starter clip. the connector that is probably loose or is not making contact. i had to redo mine because it would not start at all.

i also had an odyssey battery that died on me, bought a stock one that would fit in the engine bay and i haven't had issues as of lately.

don't give up!

[nurvcom]

Originally Posted by soon2bs13

you have not checked the battery or starter yet?

mine was giving me issues as well. check the starter clip. the connector that is probably loose or is not making contact. i had to redo mine because it would not start at all.

i also had an odyssey battery that died on me, bought a stock one that would fit in the engine bay and i haven't had issues as of lately.

don't give up!

Ok battery is Good holding over 12.something volt and i am wearing it down recharging it to keep working on it


ok starter Clip?

Starter not loose

it crank crank cranks cranks when battery low it crank crank stop crank crank stop crank

[soon2bs13]

Originally Posted by nurvcom

Ok battery is Good holding over 12.something volt and i am wearing it down recharging it to keep working on it


ok starter Clip?

Starter not loose

it crank crank cranks cranks when battery low it crank crank stop crank crank stop crank

http://i149.photobucket.com/albums/s...Photo-0063.jpg

not the picture i was looking for, but it is too dark out for me to take a picture to show you. you have the bolt for the ground and the male pin for the power. the female connector is what possibly could be loose or not making a good connection, if it is on there and you have a butt connector, that could be your issue to. my butt connector was not crimped down good enough and it pulled right off.

Originally Posted by nurvcom

oo and i got new spark plugs what the stock GAP? for RB20det?

i forgot what i gapped mine to. i believe it is .037 inches, but do not quote me on that

[nurvcom]

Originally Posted by soon2bs13

http://i149.photobucket.com/albums/s...Photo-0063.jpg

not the picture i was looking for, but it is too dark out for me to take a picture to show you. you have the bolt for the ground and the male pin for the power. the female connector is what possibly could be loose or not making a good connection, if it is on there and you have a butt connector, that could be your issue to. my butt connector was not crimped down good enough and it pulled right off.



i forgot what i gapped mine to. i believe it is .037 inches, but do not quote me on that

ok i guess it some it some kinda of signal wire to tell ECU car is starting or something
sorry if i Sound Stupid
i usally Good with cars it just this motor that got me I am a honda guy i still have a 95 RHD civic coupe with a built b18B LS swap



i guess your close i did a search and found tons of people on nico and here using this gap on rb20 and rb25
.032

[soon2bs13]

Originally Posted by nurvcom

ok i guess it some it some kinda of signal wire to tell ECU car is starting or something
sorry if i Sound Stupid
i usally Good with cars it just this motor that got me I am a honda guy i still have a 95 RHD civic coupe with a built b18B LS swap



i guess your close i did a search and found tons of people on nico and here using this gap on rb20 and rb25
.032

I am not sure the correct name of it either. haha. You don't sound stupid. Had I not done this swap and had some issues, I would not have been able to help. ;-)

I am a Honda guy myself. 2002 Civic Hatch with Greddy kit and I am nearly done building another motor (K20a2)

What plugs did you buy? I was told to buy the 300zx Turbo spark plugs.

[soon2bs13]

Crank Sensor?

My Honda's Crank Angle and Cam Sensor went out and the car wouldn't do crap...wish you had a video or if i was close enough i could look at it at least...lol

[nurvcom]

oo and i got new spark plugs what the stock GAP? for RB20det?

[nurvcom]

well i tryed messing with starter still Crank crank crank not even a sputter or cough

[RastaS13]

Bro it sounds like a ground. Happened to me and it took us forever to figure it out.

[nurvcom]

Originally Posted by RastaS13

Bro it sounds like a ground. Happened to me and it took us forever to figure it out.

I dont know what Ground i check all ground wires and Made like 6 extra grounds for the engine and one for ecu



CAM sensor new Used and all injectors fires and coils fires fine

[nurvcom]

hopefully if i can get my camera working i take a video
Any new ideas on what Should i check ???
my motor is somewhat apart
Coil and plug pulled
I checked all vac
Does Fuel rail have 2 FPRs? one on each end ?
Everyone when i Got this car it ran and started only 5 time
i got it with rb20det already swapped into car...

What I have Done in parts
harness repaired
new used cas other one was bad
new plugs
new used ECU

how many sensors are on the rb20det?
Would any sensor make the car not start???
all it does it crank over but no sputter or coughing at all!!!

[GSXRJJordan]

Proper gap is ~.030", so that's not the problem.

The wire you're looking for is orange with silver hash marks from the dash harness (I assume it's an S13), and goes to the ECU to give +12V whenever you're cranking the car. The car should start without it, if you pump the gas and crank it a few times, so I'm guessing that's not the problem. Anyway, check to make sure you have +12V at all the applicable pins using the wiring diagram:


The pin locations are from THE BACK of the ECU harness most of the time - you can check because the '100' pins are physically larger than the rest.

[nurvcom]

Originally Posted by GSXRJJordan

Proper gap is ~.030", so that's not the problem.

The wire you're looking for is orange with silver hash marks from the dash harness (I assume it's an S13), and goes to the ECU to give +12V whenever you're cranking the car. The car should start without it, if you pump the gas and crank it a few times, so I'm guessing that's not the problem. Anyway, check to make sure you have +12V at all the applicable pins using the wiring diagram:


The pin locations are from THE BACK of the ECU harness most of the time - you can check because the '100' pins are physically larger than the rest.

YA

ECU red light go's out when cranking car that should stay on? meaning that ecu stay's on

[GSXRJJordan]

Originally Posted by nurvcom

YA

ECU red light go's out when cranking car that should stay on? meaning that ecu stay's on

My guess is you've got your ECU wiring wired up directly to the ignition switch, and you're using an 'Accessory' wire instead of the black/white (or black/red, depending on where you grab it) 'Ignition' wire. Use a multimeter with a probe on your "ignition-switched +12V" leads on the ECU, see if they drop to no volts while you're cranking.

[nurvcom]

Originally Posted by GSXRJJordan

My guess is you've got your ECU wiring wired up directly to the ignition switch, and you're using an 'Accessory' wire instead of the black/white (or black/red, depending on where you grab it) 'Ignition' wire. Use a multimeter with a probe on your "ignition-switched +12V" leads on the ECU, see if they drop to no volts while you're cranking.

well My multimeter stopped working

and check wire it looks good to my eyes Man this car is first to discourage me


ok i talked to the guy who use to own the car with rb20det he swapped it in

He said it was working find and all of a sudden it just died and didn't what to start and he only got it to start a few time after and i got it to start a few time to

[simogu]

Originally Posted by nurvcom

YA

ECU red light go's out when cranking car that should stay on? meaning that ecu stay's on

RB20, Super Charge. I pretty much have the same problem, over the course of 6 months, the car was running great, the first thing I notice was sluggish idling, then the car would just die, and would not start for about 1.5 hrs. Once started is would run then die again. same results.
I then started finding vacuum hoses blown right off there connections. I was able to get the car started, then last month then it died again. Now it won't even crank over, no lights or power. My next step is trace all connections from my ECU to motor/ignition. Any advice would be greatly appreciated.