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  1. George Schreffler

    Request help: L31 5.7 Cylinder 5 Misfire

    Thanks to all for the additional posts. Schurkey, Multi-port injection was installed on the old engine and carried over to the new engine. Will try observing ignition wires while running in complete darkness. Used a spark tester - acknowledge that only gives me a visual signal and not a...
  2. George Schreffler

    Request help: L31 5.7 Cylinder 5 Misfire

    I don’t think two distributors are bad because I put the second one back in the truck I ”borrowed” it from, set the cam retard offset to zero, and that truck runs fine. I’ve had the ignition wires on and off the plugs and cap about four dozen times between swapping plugs and distributor...
  3. George Schreffler

    Request help: L31 5.7 Cylinder 5 Misfire

    Copy on inspecting for cracked spark plugs. Did that and swapped new plugs to different cylinders with no change. Misfire stays on cylinder 5.
  4. George Schreffler

    Request help: L31 5.7 Cylinder 5 Misfire

    No offense taken at any questions or suggestions because I am clearly missing something…and I hope it’s obvious and easy. I agree that number 5 does not look like it’s firing. Truck definitely runs like it has a misfire. Rough idle and rough running throughout operating range when cold. Idle...
  5. George Schreffler

    Request help: L31 5.7 Cylinder 5 Misfire

    Spark plugs continued. Both photos of a single plug on this post are #5. Photo of three plugs shows #1, #3, #5, left to right.
  6. George Schreffler

    Request help: L31 5.7 Cylinder 5 Misfire

    Old parts reused during new engine install Upper and lower intake manifolds (new gaskets for lower intake) All sensors attached to intake manifold and throttle body (inspected for vacuum leaks; sensor data outputs reviewed with scan tool) Distributor and camshaft position sensor (replacing...
  7. George Schreffler

    Request help: L31 5.7 Cylinder 5 Misfire

    Looking for help with ideas to diagnose and fix my 1998 Chevy K1500 5.7L L31 misfire. The situation and actions I have taken to date appeaser below. Any thoughts on where to go next would be appreciated. Symptom - Cylinder 5 misfire at all engine speeds - P0300 DTC; no other DTCs. Diagnosed...

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