I was doing a search on the VL Power Transistor and came up with this web site with a lot of information relating to the VL electrical components and how to test if they are working correctly, I think it would be very helpful to a lot of people. List of topics 1) Testing crank angle sensor using DC Digital Voltmeter (VL Commodore) (http://www.injectronics.com.au/assets/Uploads/InjectronicsTechnicalBulletin92.pdf) 2) VL Power Transistors (VL Commodore) (http://www.injectronics.com.au/assets/Uploads/InjectronicsTechnicalBulletin02.pdf) 5) Mass Air Flow Sensor testing on vehicle (VL Commodore) (http://www.injectronics.com.au/assets/Uploads/InjectronicsTechnicalBulletin05.pdf) 18) Coolant Temperature Sensor Operation (http://www.injectronics.com.au/index.php?option=com_content&task=view&id=68&Itemid=34) 39) Distributor rotor plate (VL Commodore) (http://www.injectronics.com.au/assets/Uploads/InjectronicsTechnicalBulletin41.pdf) 61) Injector Cut Back (VL Commodore) (http://www.injectronics.com.au/assets/Uploads/InjectronicsTechnicalBulletin66.pdf) 106) Engine is hard to start cold (Commodore VL 3.0L) (http://www.injectronics.com.au/assets/Uploads/InjectronicsTechnicalBulletin116.pdf) Website http://www.injectronics.com.au/index...stance/holden/ (http://www.injectronics.com.au/index.php/technical-assistance/holden/)