Hello all,
I'm dealing with a somewhat perplexing problem. I have a 97 explorer with auto tranny and 4L OHV engine. Yesterday morning while on an interstate drive, the engine became increasingly rough and the check engine light came on. It now idles very rough, feels like it has lost power, and the engine doesn't sound normal at speed.
I was trying to make it home, and the CEL started blinking. I pulled off the interstate and found the nearest autozone and had the fellow pull the codes. I had two cylinders misfiring, but I neglected to write down which ones. I had the codes read again this AM, and it had only one code, P0304, that cylinder 4 was misfiring.
I have used the test procedure in my Chilton manual to test plug wires, ignition coil, and IAC. Everything tested out fine. I also cleaned the IAC. Plug number four was pulled and inspeced. The plug looked good and the gap was within spec. I also pulled plug #1 for a comparision, also OK. I'm getting spark from all 6 posts on the coil pack. The DPFE sensor was replaced about 6 months ago because of an ERG flow insufficient problem. The spark plugs and wires are about 9 months old with approximately 7000 miles.
I been reading the archives and searching the net and have found the coil pack mentioned as a likely source. Also some info on vacuum leaks or manifold leaks seems to similar to my symptoms.
The fact the the problem seemed to have suddenly cropped up during a 30 mile drive leaves me a bit befuddled. Any advice or information is deeply appreciated.
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