my 2003 x type's key is turned and all lights come up but no start ....reattempts 5 to 10 times and it starts, but not always and sometimes requires a jump. Was tolerable for over 1 year as it only took 3 or 4 turns on average a couple times per month. Now it is every day. Starter Batt and alternator (which is less than a year old) all test good. The cruise not available comes on sometimes once the car gets running then disappears after 5 minutes or so. I have heard that sometimes is related to low voltage, but like I said Alternator is good. Engines does sound a little rough but then smooths out..new spark plugs less than a year old. Car has 140k miles ...Have not tried spare key, car is a mechanics and they cant ID the problem..any help on this puppy that may help me ?

 

How long are you cranking for?
If you are only giving the engine time to turn over briefly before releasing the ignition key and then trying again with a short cranking attempt, then just try cranking for a longer period of time (3-5 seconds) to see if it starts.
If it starts reliably but seems to require the abnormally longer cranking time, then you may have a faulty crank position sensor.
Engines will still start with a bad CPS, it just takes the ECU a longer cranking time to work out the engine position to correctly engage the sparking sequence.