I have a 2004 4x4, 4.0 v6 ranger. About 6 weeks ago I stared it up and it was very rough with the engine light on. The code said #1 Cyl miss fire.
I've had it in to my mechanic 4-5 times since and the engine light is still on with the same code. To make a long story short this is what has been done.
New Injector on the #1 Cyl.
Compression test, ok.
Checked for manifold leaks etc.
Changed the plug and injector with another cyl. didn't help.
Has anyone any ideas about what the problem could be? Mechanic thinks maybe computer module? Some other wiring? Local Ford dealer also has no idea.
When driven for a while it's is almost normal, almost no roughness?
Appreciate any suggestions, so far I've put $1000 into it with no luck.