That's actually how I found out cylinder 4 was dead in the first place. After doing that what am I looking for and how will it help to troubleshoot? Not questioning the idea, just want to know what it may help me determine
if there is a dead cylinder, it can be from a whole host of reasons.
Step one, find the dead one.
That’s what the temp gun is for.
Beyond that, you just have to start ruling things out.
I could be anything from a bad spark plug to a bad head gasket, and probably 50 things in between.
I’m surprised the cylinder with the bad leak down wasn’t showing cold.
Apparently as bad as it’s leaking…….. it’s still firing.