I have this problem with the ignition, we had a heavy rain for almost 3 days.
I started having this ignition problem after the rain. It cranks the first time..always and does not turn on, but on the second try it works fine.
I don't know what the problem is...I think it might be the ignition coil rail..or maybe spark plugs.
No check engine codes came up.
Any suggestions?

Thanks

 

Sorry about that but I didn't mention my car info. Grand Cherokee 2001 4WD 4.0
I am still having the same problem when I try to start my car. It never starts the first time, it does on the second or third try (most of the times it starts the second time). it use to start the first time right away.
I replaced spark plugs, fuel pump relay with no luck.
The only thing I can think of at this point is that it might be the cranckshaft positioning sensor, otherwise I think its the fuel pump or the o-ring.
Any ideas?
Thanks guys.

 

Check the fuel pressure before you try and start the engine. Leave a gauge on it over night and see if the pressure drops.