What Was Your Worst Wrenching Misdiagnosis?David Tracy3/29/16 2:11pmFiled to: CountersteerWorst Car Stories44015EditPromoteShare to KinjaToggle Conversation toolsGo to permalinkOne of the biggest nightmares in wrenching on cars is misdiagnosing faults. You spend hours and hours on what you are sure must be the problem, only to realize that you wasted an entire afternoon. AdvertisementSometimes all the symptoms seem to add up to one thing. “Surely, the head gasket is blown,” you think. You’ve got white smoke from the exhaust pipe, milky oil, a wet sparkplug, low compression in two adjacent cylinders. It must be the head gasket!Then you remove the head, only to find out that somehow, some way, you misdiagnosed your problem, and wasted an entire day of wrenching.AdvertisementI’ve been there, and I’m afraid I might be there right now.I’m in Colorado Springs, on my way home from Moab, Utah after Project Swiss Cheese did a superhero’s work driving cross-country and then off-road. My friend’s parents let me crash at their place for the night, as I snake my way through the U.S. on my return journey to Michigan.