I have a problem that started when I replacing my spark plugs with some NGK Ruthenium plugs. After I finished this project I was getting some minor idle issues and some occasional stumbling when hard accelerating although my gas mileage rose to 24 mpg for a full tank. I decided to get some OEM spark plugs from FCP Euro and when I installed them tmy XC60 barley could be driven because of the stumbling. I threw a few codes for Cylinder 1-3 and multiple misfires.
I think I have an issue with Ignitions coils because of the codes i found.
2016 Volvo XC60 T6 3.0l Inscription 73,000 miles
I am planning on replacing all of the ignition coils to see if this corrects the problem. I purchased some STI coils from eEuruparts.com for a great price. Hopefully this works.
I am wondering if anyone else had developed some issues with ignition coils when replacing spark plugs. The wiring harness is quite tight and i did find an exposed wire for cylinder #1 (1/8" exposed), I taped this wire.
I will let my Volvo dealer look at it if this does help.