Vehicle: 1996 Subaru Legacy Outback wagon. 2.2L, 5speed, 172+k miles
Back story: The vehicle was my mom's, cared for by my dad, and was in good shape when I got it from them a few years ago. Since then the O2 sensors have been replaced, and other regular maintenance with no major mishaps. About 2 months ago while checking it over with my dad, we found the left front CV boot was torn and the brake pad there was wearing slightly tilted. At the same time, we did a clutch cable adjustment, since the clutch was begining to slip. Last week I got a flat, then my donut blew out 100 yards later (this is me screaming) but I got both fixxed and have not noticed any issues with the plugged tire. It's obvious now that I need a new clutch, and so I was commuting from work to home with my wife discussing this possibility (both the idea of paying to have it done and trying to convince my dad to help me do it with his lift and excellent workshop - he's 500 miles away, but it'd be a good excuse for a visit anyway and I figured I could limp the car there if nothing else).
So as we discussed our options (paying to repair clutch, repairing it myself, or selling the car) and if I were a superstitious person I'd think the car got annoyed. In the middle of the chat, a loud thumping started from the left front. I tested it in every way I could. I pulled over and drove slowly, checked the tires, and the tires seem fine, no noise at very slow speeds.
Here's what I found:
- when accellerating, thumping stops
- when making engine work to go up hill (similar to accellerating, but no speed increase) thumping stops
- curving or turning to the left will make the thumping loud and will make it occur at even lower speeds than required to hear it when going straight
- during braking, thumping stops
- thumping occurs with or without clutch pedal depressed.
The noise is most noticeable above 30 mph, coasting in gear or out of it, and especially pronounced on left-hand curves. It's pretty loud, and I can feel the vibration of it through the floor, but next to nothing through the steering wheel and no noticeable pulling to either side. I may be crazy, but I have this sense that there's something metal rubbing on metal in the thumping (but again, I could be totally crazy and that may not be the case).
So now it's temporarily docked until I can figure this out and get it fixed. Then I've got to make the decision on the clutch (the vehicle is otherwise in pretty good shape, with normal older-vehicle issues).
This weekend I plan to pull the wheel off, check the brakes, and inspect the previously torn CV boot again. I may have more information then, but I'm also not entirely certain what to be looking for.
Any ideas what my new thumping noise is?