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injector smoke / truck died while driving / rebuilt injectors / wont refire

Discussion in '911 Diesel Down!' started by slam1, Jul 6, 2019.

  1. 79jasper

    79jasper Chickenhawk

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    That's my thought. Either the plug or the wiring under the valve cover. One injector can shut down a whole bank.

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  2. slam1

    slam1 Full Access Member

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    Ok, back in town. Truck fires and runs but I got two injectors not firing. 3 and 4. I switched injectors around and it's not firing the proven good injector. Changed the new valve cover gasket/ harness for fear it was bad out the box. New harness still not firing 3 and 4. So I'm thinking IDM???? I replaced everything else on this thing So why not this as well. Thoughts?
     
  3. slam1

    slam1 Full Access Member

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    Still not firing the second injector back on driver's side. Replaced IDM, no help. Only thing left is ECM that I can think of.
     
  4. 79jasper

    79jasper Chickenhawk

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    Pcm doesn't really control the injectors like that. Did you ohm out the harness? Or try swapping injectors to another hole to see if it followed?

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  5. slam1

    slam1 Full Access Member

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    Yes I did swap out harness and switched injectors. Both fire in hole one but not the second hole.
     
  6. slam1

    slam1 Full Access Member

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    I probably shouldn't have done this but I also tied a jumper wire from the IDM harness to the harness just before the plug to the gasket/ harness. No change. I then wired the new harness plug that came with the new gasket into the harness. No change. The IDM I purchased ,I actually drove three hours to pick up they told me no flash...... Is it possible they are incorrect? I found it unlikely a co. that remans these would be wrong.
     
  7. slam1

    slam1 Full Access Member

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    Could I have a hole in a piston or burnt rings in that cylinder?
     
  8. 79jasper

    79jasper Chickenhawk

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    Get a compression tester and find out. You can unplug the ipr and crank it. See if one hole hits different.

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  9. slam1

    slam1 Full Access Member

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    I bought one that said it would do a 7.3 but it wouldn't do the job. Need one specific to the 99' and up so I've been told. Have I been misinformed? I am ordering one tomorrow so I should know. Runs good smooths out at 1300 rpm but still low on power. No noise other than the thump thump of a dead cylinder. Valves are opening as well. I know this can be solved.
     
  10. 79jasper

    79jasper Chickenhawk

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    Once up to temp, how much blowby comes out the oil fill cap?
    You just need a adapter for a 7.3 powerstroke. Not year specific. It is a tight fit. Google/amazon/ebay "7.3 powerstroke compression test adapter"

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  11. slam1

    slam1 Full Access Member

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    Quite a bit. To be honest I don't notice any difference in blow by, but I could be wrong. I always thought there was a lot of blow by but the motor always ran strong.
     
  12. 79jasper

    79jasper Chickenhawk

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    I would say at this point, it may just be that cylinder.

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  13. slam1

    slam1 Full Access Member

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    Not sure if it matters but I have no fuel in the oil and every time I cleared that cylinder through the glow plugs hole it knocked the valve cover over with the residual oil in the cylinder.
     

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