P0300 misfire on 2014 chevy cruze 1.8L turbo

I'm working a 2014 Chevy Cruze, customer states while driving between the speeds of 60-65mph, vehicle began to overheat,and engine performance became poor, to a rough engine shake. I pulled the spark plugs normal wear,not 100% sure visually see condensation, possible antifreeze on plugs. cleaned spark plugs reinstalled,I checked misfire data on scanner showing cylinder #2 misfire 1800 times, my question how do you properly test the coil pack ECO 1.8L turbo engine?

Amp clamp and a scope makes for a fast check of the coils and control circuits. Shorted secondary issues can be found this way as well.

The easiest way I've found to test the coil pack manually is to plug it in and turn it upside down on the valve cover, boots facing up. Disconnect the injectors (or disable starting however you like), and have someone else crank the engine while you check spark strength with a test light. Compare #2 to the others. Drag the tip of the test light up and down the boots as well, to check for pinholes and leaks.

Low on coolant? I'd be tempted to pressurize the cooling system, pull the plugs again and leave it overnight. Recheck for coolant in the cylinders in the morning. While you're doing the above spark test, pull the pressure bottle cap and see if you get bubbles.

Tyler,

How do you check for coolant in the cylinders the next day?

Thanks

GeekDIYMechanic wrote: Tyler,

How do you check for coolant in the cylinders the next day?

Thanks

Usually I use a cheap borescope with my phone. Something off Amazon with a free app is good enough, as long as the scope has a light on the end.

If one of those isn't available, you can always unplug the injectors and have someone else crank the engine and watch for a coolant geyzer out of the suspected cylinder. :silly: If coolant spits out, game over.