06 Subaru P0302 - hunt for the fix...

Question

2006 Subaru Baja Turbo; a few days ago my car suddenly became difficult to start, and has a rough low-idle. Code came back P0302. I used a fuel cleaner additive to make it to my next day off (no change). My day off I replaced all 4 spark-plugs (no change). I rotated fuel injectors (no change). I then rotated ignition coils (no change). Any tips on checking electrical or compression ??? Any help is greatly appreciated.

Answer 1

The best way to find a misfire is a compression test , and yet better is a leak down test, a slipped timing belt can cause low compression on one cylinder , it always a good idea to have a leak down test perfomed.If neither one is available ,disable the ignition and crank the engine. The cranking should be even, a low compression will give a long uneven cranking sound. If you suspect that there is no cylinder head or cylinder valve problems a inspection of the timing belt should be performed, inspecting the timing marks