A few weeks ago my Taurus would sometimes take up to 5 seconds on cranking to turn over, while sometimes it would start immediately. The problem disappeared until now, and the symptoms reappeared. The next day I was able to start the engine and restart it a second time. Unfortunately after turning it off, it would not start at all anymore. When I tried, it made the briefly made the usual cranking sound, followed by continuous clicking.
I know the problem is NOT located in the battery or alternator because I do know how to diagnose those, and they are definitely not the problem.
Is it most likely the starter, a solenoid, spark plugs, or perhaps some other ignition problem? I really need to get an idea how much I'm looking at to get it fixed (this has been a very expensive month already).
Thanks so much!
Jeff