Question about 2005 Ford F 350 Super Duty

1 Answer

Injectors not getting electrical power and not releasing fuel into the cylinders, hence no engine start

I badly need the complete wiring schematic for my 2005 ford f350 Super Duty 6.0L. I have done all troubleshooting I can and even fitted new pump.Serviced all filters, but still wont start.The injectors are not introducing fuel into the cylinders.Crank or turns over fine, but their is no fuel getting into the cylinders, oil pressure is good.How do I get power to the injectors to get them to introduce fuel?They all seem completely isolated.How I do I reset computer without the WDS or IDS? Please help, If I can get a wiring schematic maybe I will be able to see the place where the power to the injectors is getting cut off.After tests and mesaures numerous time we have found that the injectors are not getting any electrical power? Help Herman Very Urgent! Truck has been down since 4th January and Its here in zimbabwe ,Africa and the nearest place for warranty is 1600miles away and I cannot tow that vehicle that far

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  • 4 more comments 
  • linecrosser May 11, 2009

    They buzz, and I have new oil in the sump and the quantity is correct also.I have gone through the oil pressure route and verified that I have correct oil pressure.When the engine is turning over the presure gage goes up above 50% and drops after about four seconds

  • linecrosser May 11, 2009

    maybe thats where im gettin confused, can you please give me the procedure to check the high pressure system,because I thought the oil system was just one .Please walk me through what I need to do to check the high pressure oil system.Or better still please explain the  difference between the two systems and how to check them and how to correct them

  • linecrosser May 12, 2009

    I do not have access to a scan tool and also the special adaptor you mentioned that goes in where the oil pressure sensor is.What causes the oil pressure to drop besides oil leaks? 

  • warlock61
    warlock61 May 11, 2010

    do you have access to a scan tool? you can monitor the oil pressure sensor. there is a special adapter the goes in where the pressure sensor is in the pass side valve cover to test the pressure. The way it works- the low pressure base oil system that lubricates the engine also feed the high pressure system- the high pressure system needs a min of 600psi to fire the injectors

  • warlock61
    warlock61 May 11, 2010

    did you check the low oil pressure or the high pressure system?

  • warlock61
    warlock61 May 11, 2010

    do the injectors buzz when the key is first turned on?

    the injectors require oil pressure to open, you might have an oil pressure concern not an electrical concern

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  • Master
  • 1,623 Answers

All pre 2008 powerstrokes use oil pressure supplied by a High Pressure Oil Pump(HPOP)to activate a plunger setup in the injector to inject fuel into the cylinders at 21 PSI. More than likely some of the HPOP components need to be replaced- i.e. valve, regulator, seal, feed tube...or the pump itself. I've replaced seals on these units since 2003, when Ford wanted to replace the pump and injectors. Did you notice a gradual increase in hard starting conditions? Do you have any visable oil leaks? Did you run the crankcase oil level down to below the add mark recently? All of these could be a factor. Ford wont tell you anything about a price because they dont like to do that before they do a diagnostic check on it and determine exactly how much needs to be fixed. Test alone will run around 100 buxs. If you are within warranty requisites then it wont matter and you likely wont be charged anything. If they crack into it have em fix as much as you can while theyre in there, because after warranty is out you are looking at a 3000 dollar repair bill from your friendly Ford dealer. Good luck...i hope this helps.

Posted on Jun 13, 2009

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Car idles rough, sometimes dies in reverse, it's worse in cold.


A cylinder that doesn't fire could be 1 of 3 things: no spark, no gas, or no compression.
Sure, it could be a bad injector, or clogged, but you should do some tests before buying an expensive new injector. You should first check the injector circuit on #2 cylinder. It's a pretty simple circuit, really. Each injector has 2 wires, a power wire and a ground wire. The power wire is one wire, which is spliced to each injector, and has battery voltage on it anytime the ignition switch is on or in "run". Each injector's ground wire is a separate wire going into the computer. When the computer internally grounds for a split second that injector's circuit, the injector sprays fuel out a tiny opening, a nozzle. You can check the circuit for #2, both the power wire and the ground side of the circuit with a test light. Post back and ask, if you want me to explain.
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How to install a fuel injector on a 2002 jeep liberty 3.7


so that mean the old one is all ready removed.?
or did you mean all steps in the fsm for INJECTOR.
the steps are the same on all EFI fuel rail injectors.
you could google that or you tube it or read the FSM.

hide call keys from step 2 on, or very bad things can happen.
(wife or kids no aware of danger)
ill just cover the (basics)
1: per FSM , depressurize the system, in can be at 60PSI
parked. so avoid fuel in eyes, or a fire. we do that first.
gain access to rail under failure. (RUF) (no barking)
2: remove injector X , wire plug. (failing)
3: then detach the injector rail clamps the both rails off as one....
injector are all now loose, to pull off.
4: add new seals to new injector, and install in reverse order.

that's it, only the gain access , varies,... mostly.

last depressure steps:
run engine,
remove fuel pump relay, engine stalls. key off, hide keys
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next tje FSM words (just the OFF section)

  1. Remove fuel tank filler tube cap.
  2. Perform Fuel System Pressure Release Procedure.
  3. Remove negative battery cable at battery.
  4. Remove air duct at throttle body air box.
  5. Remove air box at throttle body.
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  9. Disconnect electrical connectors at throttle body sensors.
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  11. Remove 4 fuel rail mounting bolts.
  12. Gently rock and pull left side of fuel rail until fuel injectors just start to clear machined holes in cylinder head. Gently rock and pull right side of rail until injectors just start to clear cylinder head holes. Repeat this procedure (left/right) until all injectors have cleared cylinder head holes.
  13. Remove fuel rail (with injectors attached) from engine.
end expert.

alldata.com
login and read all steps. that be best , then ask questions?

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You have done a great test but If I assk you to do a swap of the Ist cylinder plug and injector with one from the 3rd , we can come to a conclusion before we can change the full set of plugs and injectors for a good performance.( only if the mileage is time enough to do the change)
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Misfiring
1- a general electrical tune-up (spark plugs, wire set, cap & rotor) is a basic start to cure this issue. Wiggle the dist shaft while you are in there, if you have one.
2- Then a good carbon cleaning / throttle-body cleaning.
3- Vacuum leaks at any of the hoses that connect to the Intake manifold; especially the MAP sensor connection.
4- If that does not help then the O2 sensor could be bad or drifting.
5- Funky coil/coil-packs
6- Theoretically a microsecond glitch in either the cam or crank shaft sensors would cause this, but I am not aware of this as a typical cause.
7- Lastly a funky PCM but again it is not common for this to cause miss-firing.

Note for the V8 then also:
a) bad erg valve (this dilutes the combustion gases and hence raises the combustion temp
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Also can check the TSB 18-48-98 Ignition System Cross Fire/Secondary Ignition Wire Induction (Complete Version )

Hope help with this (remember rated this). Good luck and have a nice day.

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