As mentioned in my previous threads I have a problem with my cam shaft sensor playing up and misfiring at idle.
Problem occurs initially at start up or after coming to a stop and idling for a little bit. It gets worse with the (HID) lights on. Hesitates on initial take off. Engine light flickers too. Stored code points to cam shaft sensor.
It started 9 or more months ago, but wasn't as bad as it is now. Assuming it was a bad ground I added extra earth wires and the problem disappeared but it has slowly crept back. Removing the extra grounds makes it run so much worse now.
I have tried replacing the sensor so I suspect the alternator now. I have checked my voltages at idle and they drop below 11V at times with the HIDs on. Battery has been already been replaced.
The voltage sits on 14.4V with the engine revving and the cam shaft sensor stops playing up. The misfire seems to be in tune with the battery voltage. It doesn't play up instantly at idle, it is only once the voltage dips.
Am I right to suspect alternator, or should I be looking elsewhere first? Alternators are expensive so I want to be fairly certain.
Someone told me that Libertys have an ECU controlled alternator and that might explain the voltage drop. Is there any truth to that or am I wasting my time even thinking about it?
Lastly, if I do need to find a new alternator. What's the most cost effective option? Ebay? Secondhand?