Need help with Single Shot Injectors - Ford Powerstroke Diesel Forum
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post #1 of 23 Old 04-12-2014, 07:41 AM Thread Starter
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Need help with Single Shot Injectors- SOLVED

Six weeks ago I installed Full Force Reman Single Shot 160cc. I went with TW tunes which I am running on a Hydra. My problem are multi-faceted but I will try to describe them the best I can. Also I am on my 1st set of revised tunes from TW and they still aren't quite right.

1) As soon as I put the truck in drive the rpms jump up to 900-950 and won't come back down until it's back in park for a couple of minutes.

2) Throttle is really touchy. When the torque converter is locked if I let off/on the throttle it results in a hard jerk through the entire drivetrain. It feels a lot like differential lash but I know it's not as I did not have this issue with the stock injectors. Also because the throttle is so touchy cruise control is almost impossible cause the truck starts bucking trying to maintain light throttle.

3) When coasting between 15-30mph the idle hangs at 1,000rpms and sounds like the injectors are cutting in/out constantly. Its really, really annoying.

4) The SES light flashes randomly all the time and I am getting a P1316 code. I never had this code prior to the single shot injectors. And when I installed them I put in all new OEM harnesses/gaskets in. I have ohm tested and buzz tested the injectors with no faults detected. This one has me absolutely stumped.

I would appreciate any help, at this point I am really regretting putting in single shots as my truck runs worse now that it did with worn out AD's.

2014 F150 SCREW XLT 4x4 Ecoboost.

Last edited by blderman; 04-18-2014 at 07:31 AM.
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post #2 of 23 Old 04-12-2014, 07:53 AM
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id say get get different tunes.

but the code is idm/uvch related

Last edited by blue99stroker; 04-12-2014 at 07:56 AM.
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post #3 of 23 Old 04-12-2014, 08:08 AM
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Take out the chip to figure out if its tunes or your truck.

Yes it will idle a little rough, but not nearly as bad as what you're describing.
If it runs better without the chip, try another tuner
If it still sucks without the chip, I would take off the valve covers and be sure you got everything hooked up correctly.

My money is on a slightly loose harness connection.

Check fuel pressure too. Injectors are too expensive to not know that your FP is good.

PIS 230/80's, Van Turbo with EBPV, BD Billet Wheel
Lots of money spent at RiffRaff
Dual SD fuel pumps, in tank mods, CNC Fab bowl retain kit. SDK Tunes. Isspro.
Still pretty slow, just less slow now.
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Originally Posted by peixinho View Post
I love finally having my truck back... that 7.3 dog that I was driving was just not cutting it.

Last edited by Joel; 04-12-2014 at 08:14 AM.
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post #4 of 23 Old 04-12-2014, 11:48 AM Thread Starter
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Truck idles much worse without the Hydra.

Took everything apart two weeks ago and checked all the connections; everything was good.

Fuel Pressure is 65psi.

Does any of the tuners offer a try before you buy?

I think I will get to the IDM tonight and try some testing on it. Just so strange that I never had a single IDM code with my stock injectors and old harnesses.

2014 F150 SCREW XLT 4x4 Ecoboost.
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post #5 of 23 Old 04-12-2014, 01:19 PM
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That 1316 code could be the answer to all of this. You need to run a contribution test, buzz test, check fuel pressure.

That code means the IDM is not happy. The IDM isn't happy because something is wrong in the fuel system.

Please check out my 7.3 Enthusiast Facebook group! All are welcome! LINKY

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post #6 of 23 Old 04-12-2014, 04:17 PM Thread Starter
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Buzz test, contribution test and ohm test of the wiring at the 42 pin connector all come
back good.

2014 F150 SCREW XLT 4x4 Ecoboost.
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post #7 of 23 Old 04-12-2014, 04:27 PM
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What numbers did you get from the contribution test?

And at this point I think calling the injector builder and getting their input is best

Please check out my 7.3 Enthusiast Facebook group! All are welcome! LINKY

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post #8 of 23 Old 04-12-2014, 04:33 PM Thread Starter
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Contribution test showed a cylinders under 1% deviation. I have talked with Matt @ FF over email a few times but haven't got any resolution through him yet.

2014 F150 SCREW XLT 4x4 Ecoboost.
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post #9 of 23 Old 04-12-2014, 06:33 PM Thread Starter
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Just took out my IDM and tested all the circuits going through the IDM harness per the GB tech bulletin and found no issues. IDM is dry and well sealed.

2014 F150 SCREW XLT 4x4 Ecoboost.
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post #10 of 23 Old 04-14-2014, 04:30 PM Thread Starter
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Did some data logging on the way home today. I noticed the at idle the accelerator position is 11.43%. When I step on the pedal I have to get to 22% before I get a raise in RPMs and at that point it jumps to 1,300 RPMs. What would cause a dead spot even though the computer clearly sees the pedal movement?

2014 F150 SCREW XLT 4x4 Ecoboost.
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