bad injector?
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Junior User
Joined: Dec 2008
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bad injector?
my excursion just started hard and had rough idle one morning then code P0270 - injector, FICM or wires between are the logical choices I think.
started with wires - all connections good at FICM and injectors (applied dielectric silicone) - checked all 4 wires from injector connector pins for resistance with omh meter from X-1 connector. no change
so next is FICM. couple years back sent to ed for repair. if I remember right it was power supply side only so the "brain" side might have gone? good news is could I get a loaner FICM off fellow 6.0 and installed (can't confirm condition of loaner - trucks been parked a while) same code same cylinder - no change.
I read somewhere possibly swapping two injectors (say 2 and 4?) and see if the code follows the injector or stays with the cylinder, further test for a bad FICM.
Does anyone think that is necessary? I would hate buy and replace the #4 injector just to put it back together to find no change then forking over 6 7 hundred more on a new FICM.
started with wires - all connections good at FICM and injectors (applied dielectric silicone) - checked all 4 wires from injector connector pins for resistance with omh meter from X-1 connector. no change
so next is FICM. couple years back sent to ed for repair. if I remember right it was power supply side only so the "brain" side might have gone? good news is could I get a loaner FICM off fellow 6.0 and installed (can't confirm condition of loaner - trucks been parked a while) same code same cylinder - no change.
I read somewhere possibly swapping two injectors (say 2 and 4?) and see if the code follows the injector or stays with the cylinder, further test for a bad FICM.
Does anyone think that is necessary? I would hate buy and replace the #4 injector just to put it back together to find no change then forking over 6 7 hundred more on a new FICM.
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Junior User
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went quite a few miles with the "loaner" FICM and no change when at temp. same with original back in place.
injector pins are numbered 1 thru 4, please tell me which two will be open and the two that should be closed. I looked high and low for that info when I was checking the loom between FICM and injector connections for resistance.
injector pins are numbered 1 thru 4, please tell me which two will be open and the two that should be closed. I looked high and low for that info when I was checking the loom between FICM and injector connections for resistance.
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just read post #4 again and will use injector next to it for model of which is open and closed on the pins - got it!
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Lead Driver
Joined: Feb 2011
Posts: 8,241
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From: L.A. (Lower Alabama)
pins 1 and 2 =0.2 to 3.0 ohms
pins 3 and 4= 0.2 to 3.0 ohms
pins 1 and 3=greater than 10,000 ohms
pins 1 and 4=greater than 10,000 ohms
pins 2 and 3=greater than 10,000 ohms
pins 2 and 4=greater than 10,000 ohms
pins 3 and 4= 0.2 to 3.0 ohms
pins 1 and 3=greater than 10,000 ohms
pins 1 and 4=greater than 10,000 ohms
pins 2 and 3=greater than 10,000 ohms
pins 2 and 4=greater than 10,000 ohms
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sorry for the delay in testing the injector but I got to it this weekend and.................
cyl 2 (good)/ cyl 4 (bad?)
0.9 - 1.2 / 0.9 - 1.1 - pins 1 and 2 =0.2 to 3.0 ohms
0.9 - 1.1 / no reading - pins 3 and 4= 0.2 to 3.0 ohms
no reading / no reading - pins 1 and 3=greater than 10,000 ohms
no reading / no reading - pins 1 and 4=greater than 10,000 ohms
no reading / no reading - pins 2 and 3=greater than 10,000 ohms
no reading / no reading - pins 2 and 4=greater than 10,000 ohms
cylinder 4 was "low circuit" fault when problem began. so my question is.............
bad injector? any reason to test by swapping with #2 or is that a certain waste of time? I've read ford remanufactured w/ 24 month warranty is the way to go, what do you think? truck is stock except coolant filter and egr delete, no reason to upgrade in my opinion............................
cyl 2 (good)/ cyl 4 (bad?)
0.9 - 1.2 / 0.9 - 1.1 - pins 1 and 2 =0.2 to 3.0 ohms
0.9 - 1.1 / no reading - pins 3 and 4= 0.2 to 3.0 ohms
no reading / no reading - pins 1 and 3=greater than 10,000 ohms
no reading / no reading - pins 1 and 4=greater than 10,000 ohms
no reading / no reading - pins 2 and 3=greater than 10,000 ohms
no reading / no reading - pins 2 and 4=greater than 10,000 ohms
cylinder 4 was "low circuit" fault when problem began. so my question is.............
bad injector? any reason to test by swapping with #2 or is that a certain waste of time? I've read ford remanufactured w/ 24 month warranty is the way to go, what do you think? truck is stock except coolant filter and egr delete, no reason to upgrade in my opinion............................
Fleet Mechanic
Joined: Aug 2012
Posts: 1,760
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P0270 INJ Cylinder Number 4 Injector Circuit Low Open circuit, fuel injector, FICM connector loose
P0271 INJ Cylinder Number 4 Injector Circuit High Circuit short to ground or voltage, fuel injector
P0272 INJ Cylinder Number 4 Contribution/Balance Power cylinder, valve train or injector
This from my notes^^^^^^
If you found an open circuit then you found the problem. No sense messing with any other injector IMO. Replace the bad one with a Ford OEM reman is a good idea.
.
P0271 INJ Cylinder Number 4 Injector Circuit High Circuit short to ground or voltage, fuel injector
P0272 INJ Cylinder Number 4 Contribution/Balance Power cylinder, valve train or injector
This from my notes^^^^^^
If you found an open circuit then you found the problem. No sense messing with any other injector IMO. Replace the bad one with a Ford OEM reman is a good idea.
.
Fleet Mechanic
Joined: Sep 2006
Posts: 1,491
Likes: 295
From: Fresno, CA
Just curious, since one of the coils went bad, can you just swap the coil vs the whole injector? I guess you still have to dig into the valve cover either way, so might as well go the whole way?
Postmaster
Joined: Aug 2015
Posts: 3,910
Likes: 18
From: NW IA
Would save taking the entire injector out, might be worth the savings to some folks.
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