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Old 09-17-2011, 04:04 AM   #1
Scooby Newbie
Member#: 233640
Join Date: Dec 2009
Chapter/Region: Tri-State
Location: NYC
'04 Subaru STi

Default '04 STi Ticking Noise Under Full Boost/WOT

This noise is starting to bother me more and more. It sounds like it's coming from the driver side and ONLY happens past 3000 rpm when it's under full boost/wot and keeps making the noise till I let go. It's a very audible "tick tick tick tick tick tick" like popcorn popping (best comparison I can think of).

If I were to drive it normally past 3000 rpm even with moderate boost the ticking noise doesn't occur. I'm just worried one day I'll blow my motor. I understand the fuel injectors make ticking noises but it doesn't make sense to me that it would get that loud even on full load. It's not the all familiar heatshield noise either since I removed mine.

My mods consist of:
K&N Typhoon Intake
APS BOV 50/50
Invidia Catless Bellmouth DP
Apexi N1 copy Catback
Grimspeed AOS
Cobb AP Stage 2 Tune

Are there anyone who came across this issue and had it resolved? I'm going to check my stock boost solenoid next to see if thats the culprit but then again... I am pretty sure I'm hearing this from the driver side. I might need to sit on the pass. side to see if I can hear it from there too. Any help/insight is greatly appreciate!

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Old 09-17-2011, 04:33 PM   #2
Scooby Newbie
Member#: 224641
Join Date: Sep 2009
Chapter/Region: SCIC
Location: Southern California
2004 sti


Could be any number of things....loose timing belt guide or tensioner, bent valve, knock, loose metal or bolt banging against something....you really need to have a Subaru mechanic look at it. We can't diagnose odd noises over the internetz without at least a video with good audio....log your knock parameters with your ap and post.
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Old 02-27-2013, 03:11 AM   #3
Scooby Newbie
Member#: 339923
Join Date: Dec 2012
Location: Gainesville, VA
2006 Impreza WRX STi


did you ever figure this out? im having a similar issue, only difference is mine is one loud pop instead of multiple pops, just like you said, mine is only under WOT.
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Old 03-01-2013, 05:33 AM   #4
Scooby Specialist
Member#: 204358
Join Date: Feb 2009
Chapter/Region: SCIC
Location: Santa Paula, CA.
01 2.5RS W/ EJ257


take a video.

Ticking.. means a lot of things.
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