'00 explorer 4.0 ohv started misfiring cyl 1 after i installed a flowmaster muffler. I thought i could handle it and checked coil, plug, wires, anf uel injectors. everything looked ok, with exception to the coils, cyl 1 was not putting out enough. so i replaced coil pack and cyl 1 plug with a motorcraft plug. mechanic thought it may be a pushrod from me revving it. he did a compression test, said cranking it was 90 and then started it was 0. did a wet test, cyl 1 jumped up. but i dont smoke at all, so i really dont think its rings. he also checked for vaccum leaks. I picked it up from him and surprisingly it runs better, it doesnt misfire as much, yet. however, on occasion is will misfire when i am stops or in a parking lot, etc. but as soon as i drive, maybe 45 seconds it smooths out and stops, even when i come to a stop again. Any help would be appreciated. thank you
Nov 19, 2009 at 1:09 PM
