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Old 10-18-2019, 12:36 PM   #1
cknowlen
Scooby Specialist
 
Member#: 189077
Join Date: Sep 2008
Chapter/Region: NESIC
Location: Connecticut
Vehicle:
2011 STI limited
WRB

Default 2011 STI passenger inlet cam noise

Hello friends,
let me try to describe the issue as easy as possible.
Car- 2011 STI
Miles - 96k
Performed a timing belt change + all associated idlers/tensioner using the recommended AISIN kit. Been driving just fine for about 6k miles since the change. Went for a long drive the other day (100 + miles) and about a mile away from my house on the return trip at about 15mph the car started making a LOUD whining noise. Immediately pulled over. Started the car again and checked under the hood. Noise is still present and isolated to the passenger side of the vehicle.
Today - Removed the timing cover, noticed I had failed to properly gap the T-belt guides and there was some belt debris. Cleaned it all up, set guides properly. All timing marks appear to be correct still as well. Started the car again. Noise is still there, increases with RPM until about 30 mph where it will stop.
Back in the garage now, passenger side portion of the timing cover removed, car started, noise seems to be isolated even further to the upper passenger (inlet?) cam.
Any ideas of what to check next are welcomed
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Old 10-18-2019, 01:08 PM   #2
cknowlen
Scooby Specialist
 
Member#: 189077
Join Date: Sep 2008
Chapter/Region: NESIC
Location: Connecticut
Vehicle:
2011 STI limited
WRB

Default

well...I am an idiot, but fortunately a VERY lucky idiot.
Should have realized the issue right off the bat when I went to change the crank pullet T-belt guide to my fancy new company 23 guide and there was a bolt missing. Figure "oh i am an idiot and must have forgot to put that in, thus causing the guide to wear on the belt". In reality, it was installed, but not tightly, and that missing bolt had wedged itself behind the T-belt behind the passenger intake cam, rubbing on the belt. Cracked my cover a little bit too. Said bolt removed (thank god it didnt do more damage), cover repaired with a couple dabs of jb weld, and everything is running (and sounding) as it should now. phew.
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Old 10-18-2019, 03:11 PM   #3
Fndragn
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Member#: 470845
Join Date: Jul 2017
Chapter/Region: MWSOC
Location: Iowa
Vehicle:
2011 Sti
DGM

Default

You are very lucky, you could be building a motor!!
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Old 10-19-2019, 06:18 PM   #4
cknowlen
Scooby Specialist
 
Member#: 189077
Join Date: Sep 2008
Chapter/Region: NESIC
Location: Connecticut
Vehicle:
2011 STI limited
WRB

Default

^^ no kidding. Could have become a 10k dollar mistake real quick.
Side note. I am now getting a high (21) passenger side exhaust AVCS reading. all others it idle are 0-3. I am wondering if I messed something up while the timing cover was off. I checked the tension of the tensioner by lifting up on it. The timing belt does not feel loose and still under tension. Perhaps just bad timing and I need a new OCV ?
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Old 12-02-2019, 05:29 PM   #5
cknowlen
Scooby Specialist
 
Member#: 189077
Join Date: Sep 2008
Chapter/Region: NESIC
Location: Connecticut
Vehicle:
2011 STI limited
WRB

Default

Just providing an update to this in case anyone stumbles across this thread. The bolt which had come loose and later fell out and lodged itself behind the passenger intake cam put enough resistance on the timing belt to cause it to come out of timing by one tooth. The belt itself had a significant amount of wear from the rubbing, so I pulled the belt and replaced it with a new one from Gates. Checked the timing marks 100 times and made sure all of the belt guides were properly gapped and TIGHTENED this time. Running like a champ, and AVCS readings are back to normal.
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