It’s official. Timing jumped on the rear cam 2-3 teeth, which is where I would expect it to jump since it’s just before the tensioner. I would think this isn’t enough to cause interference so I’ll be replacing the belt and tensioner and seeing what happens to compression.l and the misfire codes.I'll try to address all the comments:
- Valve clearances have never been checked
- EGR passages haven't been cleaned but I thought the EGR was only on the front bank and my issues seem to be focused on the rear bank
- Timing belts can jump. It happens often on manual shift cars when the engine is overrevved. Subaru motors have an extra belt guide that is only on the motors for manual cars for just the reason. In any case, it would run fine one second and then not the second after it jumped.
Most importantly I'm having a heck of a time seeing everything and getting alignment using the inspection holes on the cover, BUT I do believe the timing belt jumped. With the rear cam mark seemingly lined up, the front cam mark is a tooth or two before the mark, and the marks on the crank pulley are all after the pointer. I'm going to pull the covers off and inspect further later today.
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