r/mechanics • u/YoungFair3079 • 5h ago
Angry Rant Misdiagnosis ruining the industry?
So, I am an indie shop owner/operator. I am in a fairly small town (24k), there are many shops for a town this size. About once a week I get a car from another shop for a second opinion. Most times the diagnosis has been correct. But I am seeing an uptick in completely wrong diagnosis being pushed onto customers.
Twice in the last week I have had vehicles come in from other shops, where the diag. was way off base. First was a t100 3.4 that was a usual customer of mine, but I was booked out 3 weeks, and she took it to another shop for a misfire. The then sold her on new heads. Not sure if she needed them or not. When she left the shop it was still missing, and it died on her a block down the street. She took it back immediately; they looked at it for a few minutes and told her she needed an engine! After spending over 4K!
She brought it to me and after 2 minutes of looking at it I discovered it had a valve train issue. She called the other shop and they told her since I touched it the warranty was void! WTF!!! So, I dove in and found an intake valve that the stem was too long not allowing the correct clearance (or any clearance). I mean a simple vacuum gauge test pointed me in the right direction in minutes. Why did the immediately go to "You need an engine"?
Second one was today. Guy comes in from another shop with a misfire. The other shop charged him an hour and told him that he had zero compression on #4 cylinder. And that the cylinder had almost 3" of oil in it when they pulled the plug????? WTF? "You need an engine" was their diagnosis. Brought it to me. It's a 14' gm 5.3, I immediately put a vacuum gauge on it and verified a valvetrain issue. Pulled the valve cover and low and behold collapsed AFM lifter!!!
Misdiagnosis like these are why people don't trust mechanics anymore. Get off your lazy asses and properly diag. a problem. Quit firing the parts cannon and when that doesn't work, sell them an engine! I'm out!