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  1. I

    6.4L with a hiccup misfire

    So, I bought a better compression tester and got 410psi per cylinder. The wiring harness didn’t fix issues. What did fix the cylinder 7 misfire was a trip to SC doing 70mph at roughly 2,000rpm with Hot Shots in it. My lifter wasn’t compressing periodically during cold engine temps which...
  2. I

    6.4L with a hiccup misfire

    My problem is a bad engine harness. I opened it up and found all my injectors wires and my fuel rail pressure sensor wires have been soldered. Looks like previous owner had the injector pigtails replaced. With my engine running I could touch the harness and cause misfires. I ordered a new...
  3. I

    Injector Balance/Trim Range

    +/- 9 is within range but I don’t accept anything in the 8’s. Mine is currently cold start-7 on cylinder 5 after warm up everything stays around -3
  4. I

    6.4L with a hiccup misfire

    Found Ford OEM on eBay for $40. Won’t be here till next week. I’ll keep everyone posted.
  5. I

    6.4L with a hiccup misfire

    Compression test came back 345 to 350 every cylinder. No sticking valves, no broken bridges, no missing rocker balls. I recently replaced my crank sensor and after thinking about when my issue started, it started after I replaced my crank sensor. I bought one from Auto Zone. It’s a Duralast...
  6. I

    6.4L with a hiccup misfire

  7. I

    6.4L with a hiccup misfire

    I feel like it’s #7. This is a rebuilt “bulletproofed” engine. I scoped cylinders 1,3,5,7 when I replaced the injectors. The pistons looked good but prior to replacing the injectors, #7 was dipping out on power balance. After the injector replacement #7 was still dipping out. Someone told me...
  8. I

    6.4L with a hiccup misfire

    I’ll let you know tomorrow what I find after compression test.
  9. I

    6.4L with a hiccup misfire

    I did. No metal. Did an oil change when I replaced my injectors. Filter was dirty but no metal. Magnetic oil drain plug had very small amount of micro shavings. I’m compression testing it Sunday because I’m replacing the injector harnesses. Also going to measure rocket arm travel to hopefully...
  10. I

    6.4L with a hiccup misfire

    Heard something new today. Cold start and tiny bump bump noise coming from intake box. I’m starting to lean towards a sticky valve. Gonna take the valve covers off Sunday and look at rockers and bridges then do a compression test on all cylinders. While I’m there I’m replacing both injector...
  11. I

    6.4L with a hiccup misfire

    Heard something new today. Cold start and tiny bump bump noise coming from intake box. I’m starting to lean towards a sticky valve. Gonna take the valve covers off Sunday and look at rockers and bridges then do a compression test on all cylinders. While I’m there I’m replacing both injector...
  12. I

    6.4L with a hiccup misfire

    Posted on a different forum and no one answered. I’ve got an 08 F250 with a 6.4L. Cold start just started a slight random misfire that I can’t pin down to a cylinder. I replaced all the injectors because I had 4 out of spec. I replaced the crank and cam sensor. No luck. After the engine reached...

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