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Old 08-28-2012, 06:28 PM   #1
Pickler
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Member#: 301247
Join Date: Nov 2011
Location: Toronto
Vehicle:
09 Impreza 2.5i MT
White

Default wierd sound under load

when engine is under heavy load at low rpms (1000-3000) it makes a funny rumbling sort of noise. this is made worst if the AC is on or the outside temprature is hot. i use scangauge 2 to monitor engine load mpg etc and i noticed this noise comes up when engine load hits 99% (max load). this doesnt happen under full throttle. anyone experienced this with the 2.5L?
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Old 08-30-2012, 02:24 AM   #2
dirt and road
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Member#: 293284
Join Date: Sep 2011
Chapter/Region: NWIC
Location: Pullman WA
Vehicle:
2005 2.5 RS
grey meta

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Im pretty sure its normal man mine gets really loud around 3k its just the boxer motor. Its definitely louder with the windows up. Nothing to worry about as far as i know, put an exhaust on it and you'll forget about the engine noise.
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Old 08-30-2012, 08:45 AM   #3
GrundleJuice
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Join Date: Dec 2007
Chapter/Region: South East
Location: Central Floriderp
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1982 Sex Machine
Flesh

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Quote:
Originally Posted by Pickler
when engine is under heavy load at low rpms (1000-3000) it makes a funny rumbling sort of noise. this is made worst if the AC is on or the outside temprature is hot. i use scangauge 2 to monitor engine load mpg etc and i noticed this noise comes up when engine load hits 99% (max load). this doesnt happen under full throttle. anyone experienced this with the 2.5L?
log knock correction or total timing angle or whatever you can monitor as far as ignition timing. It may be knock since knock is more likely to occur when intake air temps are higher and when load is higher (I.e. when the a/c is on)
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