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Old 01-16-2021, 12:18 PM   #7
Elbert Bass
Scooby Specialist
 
Member#: 283429
Join Date: May 2011
Chapter/Region: South East
Location: Down yonder.
Vehicle:
2016 Fuji Sunfire 03
Silver

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Quote:
Originally Posted by jimmy12345678 View Post
Another update

This might be related, but the car has has an intermittent, occasional misfire at idle ever since I've owned it and I've not been able to determine the cause. It's not enough to set a misfire code, but my experienced mechanic feel knows what a misfire feels like, haven't put a lab scope on it yet to see if I can "catch" a miss on one of the cylinders (2 channel Pico). Seems to happen more when the A/C is on, such as in the summer or when running the defroster.

Don't know if the two issues are related or not. Again not familiar with Subarus, although basic engine concepts remain the same across all makes. Didn't know if anyone had seen this problem before or if there was a common issue that caused this.
Interesting additional info about intermittent idle misfire. Two things to consider - 1. is a cam off on timing? 2. The other (more likely than timing issue) a valve guide dropping. Pull the exhaust manifold down and look up the exhaust ports to see if one or more valve guides are sticking out in the port farther than the other - there are two in each port.
I have had many valve guides drop in i-AVLS heads and they have always eventually caused a misfire that can't be attributed to normal misfire causes. That may explain the noise too.
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