4A-GE MK1 Engine fuel delivery problems!

PPiechocki · 11-15-2009, 03:13 AM

after i re-installed my motor after having it rebuilt with performance in mind, my fuel delivery system all but crapped out... my fuel pump wouldn't power up, so i fabricated a switch connecting the two areas on the service port for it, and it fired right up. now, i have fuel pressure, but my injectors won't fire... any ideas???? the injectors are all good too

espguitarist33 · 11-15-2009, 03:31 AM

get a cheap noid light from pepboys, make sure that the wiring to the injectors is firing. Also check your FPR isnt stuck open somehow

PPiechocki · 11-15-2009, 03:40 AM

my injectors have power to them.

mr2_mk1.5 · 11-15-2009, 04:15 AM

you have to use a noid light to check if there is ground while cranking since you have power. Also are you using peak and hold injectors or saturated, if they are peak and hold do you have a resistor pack on the power side, also have you checked for 12 volts at the power side of the injector, fuel pressure, fuel volume? Also check all the grounds because this sounds like a ground issue considering the fuel pump relay ground is fed through the air flow meter and only completes the ground with air across the flap, one of the most important grounds is bolted to the intake manifold and is the sensors ground. Another option is have you checked other components like for spark. I hope this helps

11-15-2009, 03:13 AM	#1 (permalink)
PPiechocki Cage Fighter Join Date: Jun 2009 Location: Granby, CO Posts: 118 Thanks: 0 Thanked 0 Times in 0 Posts iTrader Rating: (2/100% )	fuel delivery problems! after i re-installed my motor after having it rebuilt with performance in mind, my fuel delivery system all but crapped out... my fuel pump wouldn't power up, so i fabricated a switch connecting the two areas on the service port for it, and it fired right up. now, i have fuel pressure, but my injectors won't fire... any ideas???? the injectors are all good too

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11-15-2009, 03:31 AM	#2 (permalink)
espguitarist33 Cage Fighter Join Date: Nov 2008 Location: west chester PA Posts: 528 Thanks: 4 Thanked 7 Times in 7 Posts iTrader Rating: (2/100% )	get a cheap noid light from pepboys, make sure that the wiring to the injectors is firing. Also check your FPR isnt stuck open somehow

11-15-2009, 03:40 AM	#3 (permalink)
PPiechocki Cage Fighter Join Date: Jun 2009 Location: Granby, CO Posts: 118 Thanks: 0 Thanked 0 Times in 0 Posts iTrader Rating: (2/100% )	my injectors have power to them.

11-15-2009, 04:15 AM	#4 (permalink)
mr2_mk1.5 Cage Fighter Join Date: May 2009 Location: Regina, Saskatchewan Canada Posts: 165 Thanks: 0 Thanked 10 Times in 9 Posts iTrader Rating: (1/100% )	you have to use a noid light to check if there is ground while cranking since you have power. Also are you using peak and hold injectors or saturated, if they are peak and hold do you have a resistor pack on the power side, also have you checked for 12 volts at the power side of the injector, fuel pressure, fuel volume? Also check all the grounds because this sounds like a ground issue considering the fuel pump relay ground is fed through the air flow meter and only completes the ground with air across the flap, one of the most important grounds is bolted to the intake manifold and is the sensors ground. Another option is have you checked other components like for spark. I hope this helps