misfiring on cylinders 1 and 3. throwing p0300, p0301 and p0303.

2001 SUBARU IMPREZA
95,000 MILES
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GHOST_RADER
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I have a 2001 subaru impressa outback. - I have checked the compression(good), fuel pressure to that side of the engine(good), injector pulse(good), spark(good) even swapped a new coil on to make sure(no change), pulled the injectors out and made sure they were spraying which they are. i have also checked the timing marks to make sure it hasnt jumped time and thats in as well. i am stumped.
Jan 13, 2012 at 3:06 PM
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KHLOW2008
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Did you check for vacuum leaks, especially at the intake manifold?
Are the compression as good as 2 and 4?
When valve clearances are too tight, they can show good compression but while running, engine might misfire. I would suggest checking the valve clearances and adjust if necessary.

Jan 13, 2012 at 3:31 PM