I have a 2015 Mitsubishi Lancer ES Sport sedan with a CVT auto. It’s our family runabout and it has done just over 45,000 km. Ever since its first service I’ve noticed it’s distinct lack of grunt; at the 15,000 km service I told the dealership it seemed sluggish and didn’t have it’s usual grunt thinking it might be a dirty air filter or worn sparkplugs, they looked at it and surprise nothing wrong. It has lost more power since then, and I’ve told the dealership at each service since that it’s really lacking power and it sounds as if it’s sucking dirty air and has lost a lot of power. I know it’s a stock standard Lancer, but it seems to be losing power every time I get it serviced. Any ideas on what do, or what the issue could be?
All you have is your gut feeling; you need to have something more concrete than that if you hope to make any progress with the dealer. They clearly haven’t been able to find anything wrong with it when they have checked it. I would start by checking the fuel consumption. Measure it; if it’s substantially higher than it should be (7.2 L/100 km average, 5.7 L/100 km country, 9.8 K/100 km city) then that tells you there is something wrong. Then I would find a flat section of road where you could safely measure your car’s 0-100 km acceleration time, which should be around 9.5 seconds. If it takes significantly longer than that it’s also an indicator that something is amiss. With that info you can decide for yourself if there is a problem or not, and if the numbers suggest there is you have something to show the dealer.