'99 F-250 5.4L cylinder not firing
I'm hoping someone out there has had a problem with their 5.4 "p.o.s." engine as I am having.
My #3 cylinder will not fire. It has spark, a new coil pack, new spark plug that is gapped correctly, the injector is working and it is delivering fuel. The fuel pressure in the system is perfect, there is no vaccuum leak, there are no computer codes. It has had a compression test done and compression is fine
However, this cylinder 3.5 years ago had that famous blow-out problem. It was fixed with a heli-coil and has worked great ever since.
So, there is spark, fuel, and compression, but still the cylinder will not fire. There are no bad sounds coming from the engine - no rapping, ticking, pinging, valve noise or otherwise. In fact, the engine sits there and idles great and the only thing that tells you that it is missing a cylinder is you can hear the exhaust sound is rough.