injectors aren't getting a pulse signal. why??

Suprasexy · 01-21-2011, 07:26 AM

hey, i've finished hooking everything up after i dropped my newly rebuilt 7mgte back into my supra and i turned it over the other day, it fired, it started and it ran for about 5 seconds before dying. i tried starting it 4 more times with the identical results so i checked my injectors with a noid light (or however you spell that) and when i cranked it, the light didnt turn on so according to that, my injectors aren't getting a pulse signal. however fuel MUST be getting to the cylinders SOMEHOW since it starts and runs for right around 5 seconds and then dies. could the cold start injector supply enough fuel to support 5 seconds of run time? and any ideas as to why my injectors arent getting a pulse signal? thanks in advance!!! i'd love any help i can get!!

Busted Knuckles · 01-22-2011, 12:26 AM

With the ignition switch on, check for voltage at the injectors. The injectors get a steady voltage, and pulse through the ground circuit at the ECM. If no voltage, check the 30A AM2 fuse under the hood. Then check the injector resistor.

Also, check the TSRM for EFI diagnostic procedures.

Suprasexy · 01-22-2011, 03:12 AM

i feel really stupid asking this haha, but wheres the injector resistor?

01-21-2011, 07:26 AM	#1
Suprasexy Stock Join Date: Aug 2010 Location: Alberta Posts: 13	injectors aren't getting a pulse signal. why?? hey, i've finished hooking everything up after i dropped my newly rebuilt 7mgte back into my supra and i turned it over the other day, it fired, it started and it ran for about 5 seconds before dying. i tried starting it 4 more times with the identical results so i checked my injectors with a noid light (or however you spell that) and when i cranked it, the light didnt turn on so according to that, my injectors aren't getting a pulse signal. however fuel MUST be getting to the cylinders SOMEHOW since it starts and runs for right around 5 seconds and then dies. could the cold start injector supply enough fuel to support 5 seconds of run time? and any ideas as to why my injectors arent getting a pulse signal? thanks in advance!!! i'd love any help i can get!! __________________ 1987 Toyota Supra Turbo\|Fully Rebuilt Engine\| Aeromotive FPR\|T61 Turbo\|550cc/Lexus AFM\| Walbro 255lph\|Intake Hardpipe\|Gates Racing Timing Belt\|.040 Probe Pistons\|HKS HG\|ARP Head Studs\|3-Angle Valve Grind\|ACT HD 6-Puck Clutch Kit\|ARP Flywheel Bolts\|Divorced Downpipe\|BIC Test Pipe\|HKS Super Drager\|Driftmotion Intercooler/Piping Kit\|HKS SSQV Limited Edition BOV\|Oil Filter Relocation Kit w/ 19 Row Oil Cooler\|AEM A/F Gauge\|GReddy Profec B-Spec II\|Blood\|Sweat\|Tears\|Whole Lot of Supra Love.

01-22-2011, 03:12 AM	#3
Suprasexy Stock Join Date: Aug 2010 Location: Alberta Posts: 13	i feel really stupid asking this haha, but wheres the injector resistor? __________________ 1987 Toyota Supra Turbo\|Fully Rebuilt Engine\| Aeromotive FPR\|T61 Turbo\|550cc/Lexus AFM\| Walbro 255lph\|Intake Hardpipe\|Gates Racing Timing Belt\|.040 Probe Pistons\|HKS HG\|ARP Head Studs\|3-Angle Valve Grind\|ACT HD 6-Puck Clutch Kit\|ARP Flywheel Bolts\|Divorced Downpipe\|BIC Test Pipe\|HKS Super Drager\|Driftmotion Intercooler/Piping Kit\|HKS SSQV Limited Edition BOV\|Oil Filter Relocation Kit w/ 19 Row Oil Cooler\|AEM A/F Gauge\|GReddy Profec B-Spec II\|Blood\|Sweat\|Tears\|Whole Lot of Supra Love.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
A Few Q's on Turbo Injectors	Chambers	MKIII Supra	9	11-06-2007 03:26 AM
Fuel injectors	redneck ricer	MKIII Supra	0	06-15-2007 02:31 AM
No Signal to Fuel Injector	ithinkitwassumthini8	MKIII Supra	3	09-12-2006 06:35 AM

01-22-2011, 12:26 AM	#2
Busted Knuckles 12psi boost Join Date: Dec 2007 Location: Atlanta Posts: 300	With the ignition switch on, check for voltage at the injectors. The injectors get a steady voltage, and pulse through the ground circuit at the ECM. If no voltage, check the 30A AM2 fuse under the hood. Then check the injector resistor. Also, check the TSRM for EFI diagnostic procedures.