All, need your input on an issue for 2012 G37 w/168K miles. I have maintained this car well. 3 weeks ago, got a Catalytic Converter/O2 Sensor Code (forget what number that was). Than a week later, get random misfire and Cylinder 3 Misfire code, engine shakes, knocks and hesitates. I call a mobile master mechanic. He determines that its the coil, puts in a new coil, and encountering same issue, does a compression test. He says that Cylinder 3 has less than 50 lbs of compression. His opinion and advice was: cylinder has gone bad, and it will cost $3K to fix, and that i should dump the car.

Need your advice on if anyone has had this issue and what to do here. Had this car for 6 years. Sad to see it go. Thanks for your help.

 

you should ask another mechanic to check. If he's a parts-charger-type mechanic, he's not fully taking his time to diagnosising the car. He could have confirmed the coil pack but swapping it instead of just buying a new one.

granted, for compression, there's not many ways to do it wrong. did he check the other cylinders also?

 

Completely agree. You are plugging the spark plug and pumping air into a cylinder. If you have significant loss you get to rebuild or replace the engine, no two ways about it.

Good luck,


Rick