Good evening everyone,
I am coming here for some advice. I own a 2016 XC90 and am the 2nd owner. I recently was diagnosed with the oil consumption piston rings issue. Lucky for me the person I purchased the car from had a transferable extended warranty that literally covers everything. Prior to getting hit with the piston ring issue; I was also getting the P0171 CEL. I was told to replace the oil trap and that could help so I did and the CEL went away and the car drove fine. Following this issue is when we diagnosed the truck with burning too much oil. I took it to the only place that would work with my extended warranty and that was the Volvo dealership in Troy, Michigan. Now the day I took the XC 90 in, the CEL came back on, and it was P0171, I figured no big deal and the dealer would address it during the repair of the piston rings. The dealership charged me 500 for an oil consumption test followed by 200 dollars to work with the extended warranty company plus I was on the hook for 200 dollar deductible from the warranty company. The pistons and rings were repaired and the warranty company paid 6,500.
Fast forward to a week ago and the Volvo was repaired after waiting 2 months. I went to pick up the truck, no CEL and the car was driving find through city roads. When I got on the freeway, the CEL came back on, and the car would JERK if I accelerated quickly, if I accelerated slowly there was no JERK. I took it back to the dealership same day and they told me they would take a look if something was missed. I made sure to let my service advisor know that I did not have such a problem prior to brining the car in to have the pistons repaired, he also reminded me that there was a CEL the day I originally brought the vehicle in to begin with. I told him I would of told them about the jerk since my warranty company charges 1 deductible per dealership visit no matter the number of repairs needed.
Fast forward to today, I get a call while at work and it is the service advisor and he asked me If I ever had my supercharger worked on, I told him NO and neither did the previous owner who provided with me with every service record imaginable. He told me that the supercharger was leaking and failed a smoke test and that would be the cause of my jerk and that he needs to make a claim with my warranty company again, I asked him if the super charger needed to be removed when repairing the pistons and rings and he told me No? Doing some research and correct if I am wrong, the super charger needed to be removed in order to repair my pistons and rings? I also did some research and found conflicting information on if a leaking supercharger would cause my JERK when accelerating hard.
I am concerned due to a number of reasons; the car did not do this prior to taking it in for the piston ring repair, 2nd why didn't they address the CEL on the original presentation, 3rd could this supercharger leaking really be the reason why I'm jerking while accelerating quickly ? What if when they put the supercharger back on they didn't put it on right or damaged the gaskets?
Sorry for the lengthy post, but I really need some advice.