So this '02 Taurus with only 87k miles on her starts right up every time multiple times a day except for twice in the last 3 weeks. The first time was 3 weeks ago and the second was today. It happened the same both times. Turn the key and stop to let the pump prime, then when I turn to the start position the engine turns real slow and sort of in fits. Usually when a battery is low the engine turns slow but in rhythm. During my 2 starts the engine barely seemed to turn and the crankshaft rpm seemed to vary. On both starting events I let off the key and tried to start 2-3 times with rests in between. But then eventually on the 4th try it starts right up just as quickly as a normal start.

I have No clue as to what might be causing this. Only thing I know to do is, next time it does this to put a voltage meter on the battery to see if it's weak. Actually though, because both events the engine ended up starting up like normal that would indicate something other than the batt. Electrically this car is a little odd though. The interior light never comes on when the doors are opened, for years, and then last week it comes on twice when one of the rear doors is opened.

 

Might be a good idea to check battery voltage BEFORE attempting to start the engine then check it with the headlights on before starting the engine. If anything is draining the battery you will be able to tell from the readings.
If they appear OK,then it's time to voltage drop check the cables and solenoid.

 

Get the battery load tested at your parts store. Also, I would clean up all connections, including the ground at the engine block.

 

Thanks for the good advice. Will be doing all the tests yall suggested. How would the batt be tested at a parts store. Would they have to keep it overnight or could they just do it on the spot?