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Old 12-02-2019, 07:38 PM   #1
Scooby Newbie
Member#: 505768
Join Date: Aug 2019
Default Random Isuess

Hello All,
I have a 2010 Subaru Impreza 2.5i with a 2010 Subaru forester 2.5 engine i swapped in back in august due to a rod bearing failure.

Prior to the swap i would vary rarely and randomly get a solid check engine light for Cyl 3 & 4 Misfire sometime's accompanied with an additional code for catalyst below efficiency. Since the swap every time i hit about 4k RPM's i get a flashing engine light and the code is CYL 3&4 Misfire and only sometimes accompanied by a catalyst below efficiency. If i stay below that RPM range i never have issues anymore and i use to get it randomly even if i was under that range with the old engine. I already replaced the coil and that didn't help looking for advice?

Also i have a strange rattle that's gotten worse over time. The rattle only happens during moderate to heavy acceleration not light. I would say its more of a chatter then a rattle honestly. I assumed it was the heat shield and put about 6 hose clamps on and that didn't solve or change the noise one bit. looking for other common rattle ideas other then the heat shield.

1. Cyl 3 & 4 Misfire Engine light flash
2. Acceleration Rattle
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Old 12-02-2019, 08:29 PM   #2
Scooby Specialist
Member#: 80465
Join Date: Jan 2005
Chapter/Region: RMIC
Location: Denver
2001 2.5RS
Black Diamond Pearl


That rattle might be pinging, use a higher octane gas and see if that helps.
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