MarceraB16

I was driving and my car was acting completely normal. I didn't hear any pinging like detonation, but my FBK and FKL kept spiking I think it got as high as 12 for my feedback knock. I did take a data log, but I don't think I captured it all. A couple weeks ago I had a check engine light saying my throttle body position sensor and throttle pedal position sensor voltage was off and it disabled my throttle pedal. I also noticed I have feedback on my stereo when I pull my hand brake. I'm thinking maybe there is a ground that's off?? I had my knock sensor replaced with a new one, so I don't think there's anything wrong with that. My car is a 05 Subaru Legacy GT Limited AT Running a Cobb Access port Stage 0 (Simulated Stock) with no modifications done to the car. It has around 127k miles.datalog60.csv

I wanted to get some better pistons for my Legacy but I'm not sure what the stock piston size is and I'm getting different sizes online. And the ones I'm looking at to buy are 99.5mm or 99.75mm. Which of those sizes would match the stock piston size?

My dam hardly ever drops it's always remaining constant at 1and I'm sorry I'm not entirely sure yet how to check the long term fuel trims. How would I do that? And ok I'll check my exhaust Shields I should be getting the car into the shop beginning of next week

Thanks, I'll get in contact with them too. I really appreciate you both helping me with this

I have no idea what's wrong with my car. It's stock in every sense with a stage 1 93 tune. If I'm just costing at 20mph and let off and wait till the engine rpm gets to its lowest point around 1k rpm then blip the throttle I'm getting feedback knock. I had my knock sum on there, and it was jumping up in count & my feedback knock values went to -1, -2, -3..... I also had feedback knock when driving at 60 in 5th gear, downshifted to 4th and was holding the throttle around 3k rpm to speed up and I got a -4 on the feedback knock value. What's going on? What should I check? What usually causes feedback knock on Subaru turbo's, this is my first Subaru, first turbocharged engine, first Awd car. Please someone give me an idea what to do to fix this issue. Edit: also my knock sum is at crazy numbers just after a 7 min drive it said 26... and just blipping the throttle as stated above it was jumping up in like intervals of 2 or more. There isn't any audible noise, and power doesn't change at all throughout the rev range in fact it's actually stronger than before now that it's tuned. And I'm not sure if this makes a difference but it's the 5EAT transmission. If you need any more info ask and I'll provide

Thank you I really appreciate it

I'm not the most experienced with data logs. In fact, it's my first time looking at one. But anyways I got the OBD2 port to work and tuned the car but I noticed some feedback knock and knock learn so I decided to data log and upload it so someone could take a look at it for me. Is my car alright? I don't think it was anything serious but wanted to make sure...datalog2.csv

Thank you all I sincerely appreciate your help. I'll check the ground and contact cryotuning as well

Can someone please help me? I bought a 05 Legacy GT almost a year ago and for some reason I cannot pull any live data or codes off my OBD2 port. I even bought a cobb access port, and I still cannot pull anything. I had the Subaru dealer look at it and they could pull up data on the laptop and their cheap handheld tool. So, they thought maybe my ECM had been replaced at some point and the vin wasn't burned into it... So, they checked it for me, and it was. They told me they have no idea why it won't work. At this point I'm stumped too, my mechanic friends touch screen tool couldn't pull anything, my cheap tool and Bluetooth tool couldn't either and neither can the cobb access port I just bought. It won't even power on when I plug it in but does turn on if plugged into a laptop. If someone is near Rochester NY and can help or someone can help remotely that would be greatly appreciated. Please help....