What does it take to get it started?
It sounds like fuel pressure is bleeding off when the car sits. My Caravan does this at times too in the summer. Suspect a leaking injector or pressure regulator. The injectors have parts that are machined to millionths of an inch. Temperature changes cause parts to expand or contract which can compromise their ability to seal. Fuel pressure should remain in the system for weeks without running the engine. Since it starts if you only leave it sit one day, it suggests pressure is still there. Not starting after two days suggests pressure has had time to bleed down.
As a test the next time you expect it to not start, cycle the ignition switch to "run", (do not crank the engine because that will cause the injectors to bleed off what little pressure might be there). Turn the switch back off, wait a few seconds, then turn it to "run" again. Do this a third time, then try to start it. Every time you do this, the fuel pump will run for one to two seconds, then turn off. After doing that three times, the fuel pressure will be high enough for the engine to start. In my case, all I have to do is to turn the ignition switch to "run", then pause there for two seconds, THEN crank the engine. Works every time.
If this works for you, you'll need to determine the cause for loss of pressure. You will never solve a running problem on a Chrysler product by replacing the fuel filter.
Monday, January 18th, 2010 AT 1:24 AM