Hi Forum,
So I bought an Tiptronic 2003 Legacy GT early last year, and 1 week into me owning it, out of no where the turbo blew. Fast track awhile to where I could afford a new turbo which was a VF44 (Was told this was the best bolt on replacement for the stock VF38) off an 06 Legacy. I replaced the turbo, after running new engine oil with flush through the car, then replacing that with fresh oil again and checking all oil/coolant lines etc. The car was then working great! Had to park it up for 3 months due to doing an internship for my studies so had no money to run it. Once I finished that I started using the car again and it still ran fine.
After driving it around for a few weeks, I noticed that on medium-high revs the acceleration would 'pulse'. I didn't really think anything of it. I decided it would be a good idea to re-check my oil, and upon doing so I thought that it looked a bit on the thin side. Fast track another week and I drove home from work, and parked up left it running as usual to do it's thing for a minute and I noticed a knocking noise from the engine bay.. Thought to myself, 'F***'. Parked the car up left it for a day, went to check it the next day and it started fine, no knock. I decided to take it for a quick drive to make sure and about 100m down the road it started idling like a pig and I could here the knocking sound again. It is now parked up and I don't know what to do.
Are their any other factors that could cause this? Bad plugs/injectors/timing? Oil is too thin?
Any suggestions on what it could be, or what I should do next.