I spent many hours researching this and have found very little. I hope this helps someone as I document this and hope people provide some insight before I get too deep. Here's the story so far
Misfire on 2. Changed COP plugs etc. Took to large Automotive shop they recommended a 800 spark...
2003 5.4.
So I've had a single cylinder missfire that gets worse as the vehicles warms (#2). A relative compression revealed the cylinder is over 40% off the others. Is there anything electrical that could give a false reading (i.e cylinder not firing) or is this test pretty accurate for...
2003 Expedition Eddie Bauer. I have spent many hours trying to find our how to shut off the fuel pump/disable the fuel as I'm trying to do a compression test on one cylinder. I had a relative compression done and it was greater than 40% on one cylinder. I just want to compare 3 easy access...
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