SR injectors not firing - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

i need tires · 03-07-2011, 11:16 PM

What ive checked to eliminate other bad parts.

Walbro works perfect
CAS works perfect
Getting proper fuel pressure
ECU works perfect
Ive tested with another set of injectors same issue

What do you think? Ive stumped myself and I think Efrain (hard to do) lol

Thanks for input

chetos13 · 03-07-2011, 11:31 PM

check ground located behind the intake manifold close the firewall. should be 2 grounds

i need tires · 03-07-2011, 11:36 PM

Will do thank you!

zurud · 03-08-2011, 02:49 AM

Check the voltage going to the injectors

cotbu · 03-08-2011, 06:38 AM

From an electrical standpoint the injectors will not fire for 2 reasons.1: No 12v or 2: No ground trigger. Verify the injectors have a constant 12v. If that is true, we know it's a grounding issue. Most likely the wiring or ecu. Test the continuity of the injector ground wire pin from ecu to the corresponding injector.

Tip: continuity test is not really conclusive, as it only takes 1 strand to create continuity
but highly unlikely. G\L

Om1kron · 03-08-2011, 08:13 AM

Also make sure to check your engine bay fusebox, should be a 7.5-10amp fuse that handles the injector pulses. If that's broken, injectors wont fire. =)

i need tires · 03-08-2011, 11:25 AM

Quote:

Originally Posted by cotbu

From an electrical standpoint the injectors will not fire for 2 reasons.1: No 12v or 2: No ground trigger. Verify the injectors have a constant 12v. If that is true, we know it's a grounding issue. Most likely the wiring or ecu. Test the continuity of the injector ground wire pin from ecu to the corresponding injector.

Tip: continuity test is not really conclusive, as it only takes 1 strand to create continuity
but highly unlikely. G\L

Ill check this tonight and see what happens.

GroundPerformance · 03-08-2011, 11:33 AM

+1 on the grounding.

i need tires · 03-08-2011, 11:36 AM

Quote:

Originally Posted by Om1kron

Also make sure to check your engine bay fusebox, should be a 7.5-10amp fuse that handles the injector pulses. If that's broken, injectors wont fire. =)

car is wired painless style so no OEM fuse box

Om1kron · 03-09-2011, 12:28 AM

Quote:

Originally Posted by i need tires

car is wired painless style so no OEM fuse box

doesn't matter, the injectors is still something that is fused.

cotbu · 03-09-2011, 01:23 AM

That fuse is on the 12v side it also controls ECCS..., I believe, they usually blow thru human intervention! The ecu would be running off of the backup power.
And that's why i said,

Quote:

Verify the injectors have a constant 12v

If there is no 12v ref, then I would have lead him down that road. Good call though!
There's also the wiring at the wheel well area that gets corroded over time, I was also using the 12v signal ref to determine if that was the problem.

Still waiting on verification either way.

Gription · 03-09-2011, 08:17 AM

anyone have a diagram of the ground trigger system for the injectors/ecu? I'm having the same problem I think.

i need tires · 03-15-2011, 09:01 PM

k sorry took so long back from vacation decided to get a noid light set and test, looks like no power is getting to injectors.

Since i didnt do the harness im going to pass it down to the guy who did it to try and solve issue.

i need tires · 03-15-2011, 11:37 PM

Quote:

Originally Posted by cotbu

That fuse is on the 12v side it also controls ECCS..., I believe, they usually blow thru human intervention! The ecu would be running off of the backup power.
And that's why i said,
If there is no 12v ref, then I would have lead him down that road. Good call though!
There's also the wiring at the wheel well area that gets corroded over time, I was also using the 12v signal ref to determine if that was the problem.

Still waiting on verification either way.

no 12v to the injectors when ignition is on.

Also I dont have ANY chassis harness in the car, just whats needed (lights, turns, etc)

Team DET · 03-15-2011, 11:57 PM

Have you checked if you ignitor is good.I had the same problem with injector #3 not firing,ignitor was cracked at the plug

i need tires · 03-16-2011, 12:06 AM

Quote:

Originally Posted by Team DET

Have you checked if you ignitor is good.I had the same problem with injector #3 not firing,ignitor was cracked at the plug

havent tested ignitor, with starter fluid engine runs, so I assumed the ignitor is good. Would I still get spark with bad ignitor?

zurud · 03-16-2011, 01:29 AM

The injectors are hot all the time. Constant 12v. Your wiring is messed up

i need tires · 03-16-2011, 01:16 PM

Quote:

Originally Posted by zurud

The injectors are hot all the time. Constant 12v. Your wiring is messed up

This is what ive come down to, person who did wiring is coming by this weekend to get this squared up

03-07-2011, 11:16 PM	#1
i need tires Zilvia FREAK! Join Date: Dec 2005 Location: Chandler, Az Age: 38 Posts: 1,056 Trader Rating: (1) Feedback Score: 1 reviews	SR injectors not firing What ive checked to eliminate other bad parts. Walbro works perfect CAS works perfect Getting proper fuel pressure ECU works perfect Ive tested with another set of injectors same issue What do you think? Ive stumped myself and I think Efrain (hard to do) lol Thanks for input

03-07-2011, 11:31 PM	#2
chetos13 Zilvia Member Join Date: Mar 2008 Location: las vegas, nv Age: 39 Posts: 206 Trader Rating: (2) Feedback Score: 2 reviews	check ground located behind the intake manifold close the firewall. should be 2 grounds __________________ TEAM ELITE

03-08-2011, 06:38 AM	#5
cotbu Post Whore! Join Date: Sep 2005 Location: SWFL Age: 50 Posts: 3,318 Trader Rating: (3) Feedback Score: 3 reviews	From an electrical standpoint the injectors will not fire for 2 reasons.1: No 12v or 2: No ground trigger. Verify the injectors have a constant 12v. If that is true, we know it's a grounding issue. Most likely the wiring or ecu. Test the continuity of the injector ground wire pin from ecu to the corresponding injector. Tip: continuity test is not really conclusive, as it only takes 1 strand to create continuity but highly unlikely. G\L __________________ LoverTechnologies "Half Broken Things!"

03-08-2011, 08:13 AM	#6
Om1kron Post Whore! Join Date: Sep 2004 Location: Granada Hills, CA Age: 44 Posts: 6,992 Trader Rating: (15) Feedback Score: 15 reviews	Also make sure to check your engine bay fusebox, should be a 7.5-10amp fuse that handles the injector pulses. If that's broken, injectors wont fire. =) __________________ Wayne Edwards https://om1kron.blogspot.com

03-09-2011, 08:17 AM	#12
Gription Zilvia Member Join Date: Mar 2009 Location: South FL Posts: 297 Trader Rating: (4) Feedback Score: 4 reviews	anyone have a diagram of the ground trigger system for the injectors/ecu? I'm having the same problem I think. __________________ www.gentlemenstreetclub.tumblr.com \| www.mattpommell.blogspot.com

03-07-2011, 11:36 PM	#3
i need tires Zilvia FREAK! Join Date: Dec 2005 Location: Chandler, Az Age: 38 Posts: 1,056 Trader Rating: (1) Feedback Score: 1 reviews	Will do thank you!

03-08-2011, 02:49 AM	#4
zurud Zilvia Junkie Join Date: Aug 2009 Location: evansville, in Posts: 391 Trader Rating: (4) Feedback Score: 4 reviews	Check the voltage going to the injectors

03-08-2011, 11:33 AM	#8
GroundPerformance Zilvia FREAK! Join Date: Oct 2008 Location: Socal Posts: 1,479 Trader Rating: (44) Feedback Score: 44 reviews	+1 on the grounding.

03-15-2011, 09:01 PM	#13
i need tires Zilvia FREAK! Join Date: Dec 2005 Location: Chandler, Az Age: 38 Posts: 1,056 Trader Rating: (1) Feedback Score: 1 reviews	k sorry took so long back from vacation decided to get a noid light set and test, looks like no power is getting to injectors. Since i didnt do the harness im going to pass it down to the guy who did it to try and solve issue.

03-15-2011, 11:57 PM	#15
Team DET Zilvia Addict Join Date: May 2008 Location: San Bernardino Posts: 770 Trader Rating: (13) Feedback Score: 13 reviews	Have you checked if you ignitor is good.I had the same problem with injector #3 not firing,ignitor was cracked at the plug __________________ (OΞO/- -\OΞO)

03-16-2011, 01:29 AM	#17
zurud Zilvia Junkie Join Date: Aug 2009 Location: evansville, in Posts: 391 Trader Rating: (4) Feedback Score: 4 reviews	The injectors are hot all the time. Constant 12v. Your wiring is messed up