Rb20 s14 starts then dies STUMPED - Page 2 - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

BenRice · 10-08-2019, 05:38 PM

So close!!!

Agree about removing the CAS and spinning it to see if the injectors click, but before that just try cleaning the contacts on the CAS plug first. Remember, the CAS plug needs to push on reasonable hard and clicks when fully seated (if the plug isn't broken)

If the plug contacts are cleaned & the injectors click when the CAS is spun, it may be worth pulling injectors to see if they're wet or dry.

If they're wet, and seeing as though it's not a stock harness, are you 100% the injector plugs are plugged into the right injectors?

BenRice · 10-08-2019, 05:41 PM

Oh and when you want to post another photo, click the Image icon and enter the Direct Link url when prompted and it will embed

Like this:

NoBrakes! · 10-08-2019, 05:48 PM

Ok so when i go back after work ill do the test light and check with the cas then update. I also forgot to mention that unplugging the cas had no change at all. So if i take that piece out and spin the shaft on it i can hear clicking where injection is supposed to occur via clicking or when someone is cranking the motor?

S14rebuild · 10-08-2019, 05:53 PM

Unbolt the cas from the engine, leave it plugged into the harness.... turn key to ignition on(not cranking) and turn the cas. U should here injector clicking as u spin the cas.

But to 100% verify, use the test light or noid light. Hook test light to 12volt postive and test the negative pin on the injector. While turn the cas by hand....u should see the test light flash. (Can do the same test with cas plugged in and bolted down on engine, just crank the engine over)

Were testing to see if the injector is getting its ground from the computer.

Cas send signal to ecu on engine postion while turning...computer takes that signal...knows when to fire each injector and then grounds out that circuit and the fuel injector fires.

So u have fuel pressure, so were now focused on fuel spraying into the cylinder.

S14rebuild · 10-08-2019, 05:54 PM

Looking at a -

faulty cas(not likely cause u have spark)

Ecu (again not likely very random to have 6 bad injector drivers bad)

Wiring issue

But lets do the tests stated abouve first.

NoBrakes! · 10-08-2019, 06:06 PM

Quote:

Originally Posted by S14rebuild

Looking at a -

faulty cas(not likely cause u have spark)

Ecu (again not likely very random to have 6 bad injector drivers bad)

Wiring issue

But lets do the tests stated abouve first.

Oh ok cool will definitely update
Would it be a wiring issue through the wiring specialties harness? It is brand new freshly made.

I was also told i could have the lines swapped on the chassis end so ill probably pull em to see which one sprays fuel when i prime the pump just to confirm completely.

S14rebuild · 10-08-2019, 06:07 PM

No need to check that u got 40psi...ur good on the fuel lines

NoBrakes! · 10-08-2019, 06:15 PM

Okay, and it couldnt be the fuel quality either?

S14rebuild · 10-08-2019, 06:17 PM

Well lets make sure the injectors are acually putting the gas in the cylinder.

It could be gas quality.

NoBrakes! · 10-08-2019, 06:20 PM

Quote:

Originally Posted by BenRice

So close!!!

Agree about removing the CAS and spinning it to see if the injectors click, but before that just try cleaning the contacts on the CAS plug first. Remember, the CAS plug needs to push on reasonable hard and clicks when fully seated (if the plug isn't broken)

If the plug contacts are cleaned & the injectors click when the CAS is spun, it may be worth pulling injectors to see if they're wet or dry.

If they're wet, and seeing as though it's not a stock harness, are you 100% the injector plugs are plugged into the right injectors?

Fingers crossed then, im pretty sure there in the right ones since they are numbered on the harness i cant remember while im away but thats a easy check. Cyl 1 is furthest to the front right

S14rebuild · 10-08-2019, 06:23 PM

Cylinder #1 is the injector towards the front of the engine

Like this

Firewall
6
5
4
3
2
1
Radiator

NoBrakes! · 10-09-2019, 12:42 AM

So i got out of work extremely late and still went to test the injectors with a test light but i didnt do that second test ill have to wait till wednsday night or Thursday due to me being out of town. However

Hooked the test light up to 12v from the battery (keep in mind this is a incandescent bulb test light not a led). Touching the light to the ground side caused the test light to light up in the on position same for the power wire. Touching the ground while cranking caused the test light not to shine at all and that was for both sides (power and ground)

NoBrakes! · 10-09-2019, 12:43 AM

Quote:

Originally Posted by S14rebuild

Cylinder #1 is the injector towards the front of the engine

Like this

Firewall
6
5
4
3
2
1
Radiator

Also the injectors are in the right order

S14rebuild · 10-09-2019, 05:06 AM

Quote:

Originally Posted by NoBrakes!

So i got out of work extremely late and still went to test the injectors with a test light but i didnt do that second test ill have to wait till wednsday night or Thursday due to me being out of town. However

Hooked the test light up to 12v from the battery (keep in mind this is a incandescent bulb test light not a led). Touching the light to the ground side caused the test light to light up in the on position same for the power wire. Touching the ground while cranking caused the test light not to shine at all and that was for both sides (power and ground)

Injector should have.... 1 wire(+constant) key on/cranking/running(this is power feed wire, from a relay)
1 wire(-pulsing) cranking/running(this is grounding wire from ecu)

Test the injector connector for these with it unplugged from the injector

NoBrakes! · 10-09-2019, 07:49 AM

Yea the white wire on them seems to be the 12v constant ill have to check the black one again when i return and update.

You can tell ive never done something this involved on a car lol. But is it possible to pull the injector leave it connected and see if it clicks or something? Similar to visually confirming spark. I kno i can do that if i pull the whole rail but with the stock plenem and everything kinda wanna avoid it.

S14rebuild · 10-09-2019, 08:04 AM

Yea, no need to pull the rail these test will confirm all we need to know. Were heading in the eight direction with this. U have fuel pressure, so we know fuel is flowing theu the rail. Now were working on getn the injectors to open so fuel can spray out.

Check those wires and will go from there

BenRice · 10-09-2019, 03:26 PM

Probably worth mentioning all you're doing is unplugging the harness's injector plug on cylinder 1 and measuring the voltage from those pins

Leave the injectors themselves in the rail and on the car

Also, incandescent bulbs aren't the best as test lights - i used one to measure VCT and thought it wouldn't light up. Grab a proper test light from an auto parts store, they cost peanuts

S14rebuild · 10-09-2019, 03:55 PM

Quote:

Originally Posted by BenRice

Probably worth mentioning all you're doing is unplugging the harness's injector plug on cylinder 1 and measuring the voltage from those pins

Leave the injectors themselves in the rail and on the car

Also, incandescent bulbs aren't the best as test lights - i used one to measure VCT and thought it wouldn't light up. Grab a proper test light from an auto parts store, they cost peanuts

Hes using an incandescent bulb test light...not just a bulb with wires

What hes using will work fine for these tests

NoBrakes! · 10-10-2019, 07:47 AM

Just tested key on
White wire 12v
Black wire 12v
Both at the unplugged connector
Is something powered that should be grounded?

S14rebuild · 10-10-2019, 07:50 AM

White white should have 12v key on

Black should have pulsing ground while cranking/running

Is this the same reault for all 6 injector connectors?

NoBrakes! · 10-10-2019, 07:52 AM

Quote:

Originally Posted by S14rebuild

White white should have 12v key on

Black should have pulsing ground while cranking/running

Is this the same reault for all 6 injector connectors?

Its the same for 1 and 2

S14rebuild · 10-10-2019, 08:04 AM

This is a brand new harness?

Weird.... either the computers bad or u have all injector wires shorted to power.

Power flow goes

Power(+) relay---injector---computer(-)

Thats it

NoBrakes! · 10-10-2019, 08:08 AM

Quote:

Originally Posted by S14rebuild

This is a brand new harness?

Weird.... either the computers bad or u have all injector wires shorted to power.

Power flow goes

Power(+) relay---injector---computer(-)

Thats it

Printed ecu pinout gonna test injector grounds. It a brand new harnes from them so if thats it imma be pissed i waited forever for this thing

S14rebuild · 10-10-2019, 08:49 AM

Yea i def check the grounds.....id find it very odd that all 6 injectors ground wires are shorted though

NoBrakes! · 10-10-2019, 09:26 AM

Quote:

Originally Posted by S14rebuild

Yea i def check the grounds.....id find it very odd that all 6 injectors ground wires are shorted though

Checked all ecu pins and they have ground so im completely confused ground at the ecu power at the injectors all thats in between is wiring from the harness nothing left to test. I emailed wiring specialties imma see what they say. Garenteed to not be in the show now

S14rebuild · 10-10-2019, 10:03 AM

Check continuity between the injector ground pin and its corresponding pin at the ecu.

NoBrakes! · 10-10-2019, 10:32 AM

Quote:

Originally Posted by S14rebuild

Check continuity between the injector ground pin and its corresponding pin at the ecu.

-12v on all im thinking they are all opened somewhere ground side so power just skips the injectors and goes to the open

S14rebuild · 10-10-2019, 10:36 AM

There suppose to me open circuit till the ecu grounds it.

S14rebuild · 10-10-2019, 10:37 AM

With engine crankn, are u getting ground pulse at the ecu for injector #1

S14rebuild · 10-10-2019, 10:41 AM

Pin 107 108 116 shows grounds for injectors

Check for with ley on and whike cranking

https://www.google.com/search?q=rb20...wqHeD4b7tugtvM

10-08-2019, 05:38 PM	#31
BenRice Leaky Injector Join Date: Feb 2011 Location: Mt Maunganui, New Zealand Age: 37 Posts: 84 Trader Rating: (0) Feedback Score: 0 reviews	So close!!! Agree about removing the CAS and spinning it to see if the injectors click, but before that just try cleaning the contacts on the CAS plug first. Remember, the CAS plug needs to push on reasonable hard and clicks when fully seated (if the plug isn't broken) If the plug contacts are cleaned & the injectors click when the CAS is spun, it may be worth pulling injectors to see if they're wet or dry. If they're wet, and seeing as though it's not a stock harness, are you 100% the injector plugs are plugged into the right injectors? __________________ https://www.instagram.com/unclebensriceballs/

10-08-2019, 05:41 PM	#32
BenRice Leaky Injector Join Date: Feb 2011 Location: Mt Maunganui, New Zealand Age: 37 Posts: 84 Trader Rating: (0) Feedback Score: 0 reviews	Oh and when you want to post another photo, click the Image icon and enter the Direct Link url when prompted and it will embed Like this: __________________ https://www.instagram.com/unclebensriceballs/

10-08-2019, 05:48 PM	#33
NoBrakes! Join Date: Oct 2018 Location: carbondale il Posts: 48 Trader Rating: (0) Feedback Score: 0 reviews	Ok so when i go back after work ill do the test light and check with the cas then update. I also forgot to mention that unplugging the cas had no change at all. So if i take that piece out and spin the shaft on it i can hear clicking where injection is supposed to occur via clicking or when someone is cranking the motor? __________________ Natural selections finest

10-08-2019, 06:15 PM	#38
NoBrakes! Join Date: Oct 2018 Location: carbondale il Posts: 48 Trader Rating: (0) Feedback Score: 0 reviews	Okay, and it couldnt be the fuel quality either? __________________ Natural selections finest

10-09-2019, 12:42 AM	#42
NoBrakes! Join Date: Oct 2018 Location: carbondale il Posts: 48 Trader Rating: (0) Feedback Score: 0 reviews	So i got out of work extremely late and still went to test the injectors with a test light but i didnt do that second test ill have to wait till wednsday night or Thursday due to me being out of town. However Hooked the test light up to 12v from the battery (keep in mind this is a incandescent bulb test light not a led). Touching the light to the ground side caused the test light to light up in the on position same for the power wire. Touching the ground while cranking caused the test light not to shine at all and that was for both sides (power and ground) __________________ Natural selections finest

10-08-2019, 05:53 PM	#34
S14rebuild BANNED Join Date: May 2019 Location: Florida-FAIL Posts: 2,497 Trader Rating: (8) Feedback Score: 8 reviews	Unbolt the cas from the engine, leave it plugged into the harness.... turn key to ignition on(not cranking) and turn the cas. U should here injector clicking as u spin the cas. But to 100% verify, use the test light or noid light. Hook test light to 12volt postive and test the negative pin on the injector. While turn the cas by hand....u should see the test light flash. (Can do the same test with cas plugged in and bolted down on engine, just crank the engine over) Were testing to see if the injector is getting its ground from the computer. Cas send signal to ecu on engine postion while turning...computer takes that signal...knows when to fire each injector and then grounds out that circuit and the fuel injector fires. So u have fuel pressure, so were now focused on fuel spraying into the cylinder.

10-08-2019, 05:54 PM	#35
S14rebuild BANNED Join Date: May 2019 Location: Florida-FAIL Posts: 2,497 Trader Rating: (8) Feedback Score: 8 reviews	Looking at a - faulty cas(not likely cause u have spark) Ecu (again not likely very random to have 6 bad injector drivers bad) Wiring issue But lets do the tests stated abouve first.

10-08-2019, 06:07 PM	#37
S14rebuild BANNED Join Date: May 2019 Location: Florida-FAIL Posts: 2,497 Trader Rating: (8) Feedback Score: 8 reviews	No need to check that u got 40psi...ur good on the fuel lines

10-08-2019, 06:17 PM	#39
S14rebuild BANNED Join Date: May 2019 Location: Florida-FAIL Posts: 2,497 Trader Rating: (8) Feedback Score: 8 reviews	Well lets make sure the injectors are acually putting the gas in the cylinder. It could be gas quality.

10-08-2019, 06:23 PM	#41
S14rebuild BANNED Join Date: May 2019 Location: Florida-FAIL Posts: 2,497 Trader Rating: (8) Feedback Score: 8 reviews	Cylinder #1 is the injector towards the front of the engine Like this Firewall 6 5 4 3 2 1 Radiator

10-09-2019, 07:49 AM	#45
NoBrakes! Join Date: Oct 2018 Location: carbondale il Posts: 48 Trader Rating: (0) Feedback Score: 0 reviews	Yea the white wire on them seems to be the 12v constant ill have to check the black one again when i return and update. You can tell ive never done something this involved on a car lol. But is it possible to pull the injector leave it connected and see if it clicks or something? Similar to visually confirming spark. I kno i can do that if i pull the whole rail but with the stock plenem and everything kinda wanna avoid it. __________________ Natural selections finest

10-09-2019, 08:04 AM	#46
S14rebuild BANNED Join Date: May 2019 Location: Florida-FAIL Posts: 2,497 Trader Rating: (8) Feedback Score: 8 reviews	Yea, no need to pull the rail these test will confirm all we need to know. Were heading in the eight direction with this. U have fuel pressure, so we know fuel is flowing theu the rail. Now were working on getn the injectors to open so fuel can spray out. Check those wires and will go from there

10-09-2019, 03:26 PM	#47
BenRice Leaky Injector Join Date: Feb 2011 Location: Mt Maunganui, New Zealand Age: 37 Posts: 84 Trader Rating: (0) Feedback Score: 0 reviews	Probably worth mentioning all you're doing is unplugging the harness's injector plug on cylinder 1 and measuring the voltage from those pins Leave the injectors themselves in the rail and on the car Also, incandescent bulbs aren't the best as test lights - i used one to measure VCT and thought it wouldn't light up. Grab a proper test light from an auto parts store, they cost peanuts __________________ https://www.instagram.com/unclebensriceballs/

10-10-2019, 07:47 AM	#49
NoBrakes! Join Date: Oct 2018 Location: carbondale il Posts: 48 Trader Rating: (0) Feedback Score: 0 reviews	Just tested key on White wire 12v Black wire 12v Both at the unplugged connector Is something powered that should be grounded? __________________ Natural selections finest

10-10-2019, 07:50 AM	#50
S14rebuild BANNED Join Date: May 2019 Location: Florida-FAIL Posts: 2,497 Trader Rating: (8) Feedback Score: 8 reviews	White white should have 12v key on Black should have pulsing ground while cranking/running Is this the same reault for all 6 injector connectors?

10-10-2019, 08:04 AM	#52
S14rebuild BANNED Join Date: May 2019 Location: Florida-FAIL Posts: 2,497 Trader Rating: (8) Feedback Score: 8 reviews	This is a brand new harness? Weird.... either the computers bad or u have all injector wires shorted to power. Power flow goes Power(+) relay---injector---computer(-) Thats it

10-10-2019, 08:49 AM	#54
S14rebuild BANNED Join Date: May 2019 Location: Florida-FAIL Posts: 2,497 Trader Rating: (8) Feedback Score: 8 reviews	Yea i def check the grounds.....id find it very odd that all 6 injectors ground wires are shorted though

10-10-2019, 10:03 AM	#56
S14rebuild BANNED Join Date: May 2019 Location: Florida-FAIL Posts: 2,497 Trader Rating: (8) Feedback Score: 8 reviews	Check continuity between the injector ground pin and its corresponding pin at the ecu.

10-10-2019, 10:36 AM	#58
S14rebuild BANNED Join Date: May 2019 Location: Florida-FAIL Posts: 2,497 Trader Rating: (8) Feedback Score: 8 reviews	There suppose to me open circuit till the ecu grounds it.

10-10-2019, 10:37 AM	#59
S14rebuild BANNED Join Date: May 2019 Location: Florida-FAIL Posts: 2,497 Trader Rating: (8) Feedback Score: 8 reviews	With engine crankn, are u getting ground pulse at the ecu for injector #1

10-10-2019, 10:41 AM	#60
S14rebuild BANNED Join Date: May 2019 Location: Florida-FAIL Posts: 2,497 Trader Rating: (8) Feedback Score: 8 reviews	Pin 107 108 116 shows grounds for injectors Check for with ley on and whike cranking https://www.google.com/search?q=rb20...wqHeD4b7tugtvM

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