Join Date: Oct 2008
Location: Ontario, Canada
Car: 2012 Outback LTD
Feedback Score: 0 reviews
OK, some clarification. The stumble at idle, shaking, and hesitation on initial launch, was all present before the plug change and the fuel injector cleaner application.
The correction to all of the problems was almost immediate, and noticeable the next time I had the car out for a drive. Unfortunately, my wife had the first drive using the Subie, while I was relegated to the diesel dually, just because that's how vehicles were parked in the driveway, with her car barricaded in the garage.
I asked her how it ran after my fix, and she said that she hadn't really noticed. (Read ego deflated on my part, as well as some frustration.)
The very next day I got to the Subie first and it was very easy to see that the problem was fixed. I would have to say that the platinum plugs made the biggest difference, simply because there hadn't been enough miles put on the car for the injector cleaner to have done much in the way of cleaning.
As for which injector cleaner I used, it was whatever bottle I latched onto at the parts store, I don't recall. I'm sure that others on here can suggest their favourites, and maybe they're all the same. (I was really going to use SeaFoam, but the store I went to didn't sell it.)
I purchased the car new, and changed the original plugs out at 35 000 km by putting in Bosch Platinum's then. From anything I've seen over the years, platinum's are supposed to be good for 100 000 km, which would have been about the mileage that my last set had gone before the stumbling problem.
Hope this helps!