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99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the 99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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Old 08-23-2011, 11:16 AM   #1 (permalink)
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How to test Injector?

Service engine light came on and engine runs rough. Pulled codes and came up with P1274, P1119, P0605. The last two are probably due to my Western Diesel tow chip, but the P1274 is cylinder 4 being out. Pulled the valve cover expecting to see the wire harness loose, but it is clipped tight. Started motor and injector #4 is not exhausting any oil, so code is correct.

Pulled the connector on the injector #4 and hooked up volt meter and reads 3DC volt or 7.5 AC with engine running

Does this mean the electric is fine and the injector solenoid is bad?

How do I test the solenoid?
What should the voltage be at the injector?

Is there anything else I should check?
Should I do an OHM test on the valve cover gasket connector?

The injector wire harness was replaced about two years ago and still looks new.
Could the Valve cover wire connector be bad and still read voltage at the connector?

Thanks
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Old 08-23-2011, 01:02 PM   #2 (permalink)
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The injector should be around 2.9 ohms. The voltage to the injector is 110 volts, but the pulse width is too short for your voltmeter. You'd have to get an oscilloscope to measure that - don't worry about it. You can ohm your wiring back to the IDM if you want to, but odds are the injector is bad. Unlikely bad on the solenoid side - more likely bad on the mechanical side. The code is thrown due to a large decrease in the rotational velocity when that injector should be firing. You could verify it by swapping it with another injector, but I'm betting you should just replace it. How many miles on the injectors? If I had over 200K, I'd pull them all and send them to be tested as a group. Here's where you can send them:

Injector Flow Testing
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Old 08-23-2011, 03:28 PM   #3 (permalink)
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The code is thrown due to a large decrease in the rotational velocity when that injector should be firing.
The P1274 is an injector circuit code not from a Cylinder Contribution Test. The problem is either with the injector solenoid, the wiring between there and the IDM or the IDM itself.
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Old 08-23-2011, 04:30 PM   #4 (permalink)
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Oops - should have looked the code up before opening my big mouth...
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Old 08-23-2011, 08:03 PM   #5 (permalink)
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I am currently having similar issues so I am far from an expert but here are the steps that I have been going through as far as checking the electrical.

1.) Buzz Test run by AE scanner (or other similar) to check the injector solenoids for similar sound and function...as stated it is highly unlikely the solenoids are at fault.
2.) Ohm test via GB Remanufacturing - Tech Bulletin #103 Great step by step and valuable information. This will tell you if there is any issues in conductivity from IDM plug through all connection and wiring, through the solenoid and back.
3.) finally based on my knowledge and what I have seen in posting on forums, an injector that is not spitting oil at an equal rate to the others or at all has faulty mechanical internals.

Now my opinion I would say you need a new injector.
Best of luck
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Old 08-24-2011, 01:28 PM   #6 (permalink)
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Thanks for the helpful replies.

I tested the wire harness from the IDM to the Injector #4 and it has good continuity on both sides. Also checked the resistance on each Drivers side Injector coil from the IDM and they all read 3.3 ohms. No shorts to ground

I swapped the Injector Coils between #2 & #4 and the problem remains on #4.

With the wires having good continuity-does this mean the IDM must be the problem?
Could the Injector itself be the problem?

The truck has 170,000 miles on it
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Old 08-24-2011, 04:36 PM   #7 (permalink)
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With the wires having good continuity-does this mean the IDM must be the problem?
That would be my take with you swapping injector solenoids and getting the same result on #4.

Next step would be to find someone willing to swap your IDM into his truck and see if the P1274 pops up. If the problem is somewhere else in your truck, you don't run the risk of affecting his IDM by swapping it into his truck. A buddy with a 94-97 Powerstroke would be ideal, because the IDM is mounted WAY more accessible than on the SuperDuty trucks. It's right by the driver's side hood hinge and takes all of 10 minutes to R&R.

Good luck.
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99.5 F250 PSD Supercab LB 4x4, ZF-6 w/SB Con OFE, 3.73LS, Boost & pyro gauges, Swamps S175/146 injectors, DP 80 HP Econo PCM (classic version), AIS, coolant filter w/"hokum" bracket, regulated return, heated mirror mod, lighted cupholder, Marinco heater plug-in.

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Old 08-24-2011, 10:24 PM   #8 (permalink)
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Swapped Injector #2 & #4 today and the problem moved with the injector, so it is the injector.
Plan to pull them all and have a local injector shop test them and replace any that are worn.

Thanks for all the help guys
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Old 09-10-2011, 04:33 PM   #9 (permalink)
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Decided to pull all the injectors out and have them rebuilt since my truck has 170k miles on it and figure if one went more are not far behind.

Found I could have all mine fully rebuilt with all new internal orings, springs and new nozzles as well as machining and checking all internal parts & testing for less than off the shelf rebuilds. Sent them to Rosewood Diesel and Jim turned them around in less than three days for $930 for all eight.

They are all back in and working fine.

Thanks for all the help.
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