Cracked Cylinder Diagnosis: Check the Spark Plugs

Video Transcript

DOUG JENKINS: Hi. I'm Doug. I work with 20 great guys in St. Louis at Doug Jenkins Custom Hot Rods, and we're going to do some work for you today on Expert Village. So Dan is very carefully pulling off the spark-plug wires. The headers are real warm in there. He could stand around for 20 minutes and wait for it to cool off, but he has decided to take one for the team and get in there while it's hot. There are very few muscle cars as tight to work on as a Mustang with a big motor in it. So Dan will use a variety of different extensions and adapters and swivels and sockets to try to get the plugs out of this engine. Dan has the plugs pulled out and we've laid them on this piece of paper as they are in the motor, front to back, left and right. The camera is at the front of the car looking back. All of the plugs are the same color except number 6. Number 6 would be the second to the left--second to the front on the left-hand side and it's a lot brighter color. It's more of a light color where the rest of them have a nice little bit of black on them, meaning the engine was running a little bit rich. But number 6 is abnormal, so we're going to start looking at that one first. We didn't get any coolant out the tailpipe so we pulled the plugs, and we're kinda narrowing it down a little bit here.

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