Multiple Misfire P0300

gearmesh, inc. · 06-26-2011, 09:28 PM

Sometimes the core of the wire ohms out good, but the insulation of the boot can be weak. Under light load, the mixture in the cylinder is easy to light and the spark energy has no problem making it all the way to the plug gap. Under heavy load, the mixture in the cylinder is harder to light, and the spark energy can find it easier to breach a weak plug boot and jump to ground instead.

Swap the wire on #8 first. If you still get a misfire staying with #8, then trade plugs with another cylinder. You may eventually even have to switch the coil or injector with another cylinder. When you get the misfire to move, you have found your offender.

06-26-2011, 09:28 PM	#12
gearmesh, inc. creepy azz cracka Join Date: Nov 2008 Location: Summerville Posts: 1,587	Sometimes the core of the wire ohms out good, but the insulation of the boot can be weak. Under light load, the mixture in the cylinder is easy to light and the spark energy has no problem making it all the way to the plug gap. Under heavy load, the mixture in the cylinder is harder to light, and the spark energy can find it easier to breach a weak plug boot and jump to ground instead. Swap the wire on #8 first. If you still get a misfire staying with #8, then trade plugs with another cylinder. You may eventually even have to switch the coil or injector with another cylinder. When you get the misfire to move, you have found your offender. __________________ "I came into this world kicking, screaming,and covered in someone else's blood, I have no problem leaving the same way!" ÔÇ£If you carry a gun, people will call you paranoid. ThatÔÇÖs ridiculous. If I have a gun, what in the hell do I have to be paranoid about?ÔÇØ -Clint Smith, Thunder Ranch.