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Old 03-13-2009, 07:16 PM   #1
ki11switch
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Member#: 176422
Join Date: Apr 2008
Chapter/Region: NWIC
Default Part Time Knocking NOISE! Built engine/hydra what is it?

ok i bought 06 wrx in florida a month ago and drove it back to oregon. Since the day after i bought it, a loud knocking noise sometimes comes on for random lengths of time. What could it be? Does rod knock go away and come back? piston slap? I am thinking it might be one of the accessorie belt parts like the a/c pump, ps pump or alternator...

Its running off hydra ems 2.5 any way it could be the tune?

also the engine has 100mm cp pistons, eagle rods, bc 280/280 cams, and a gt35r set up.

I cant really take my car into a shop because the noise will most likely not be there because it is very random, but so loud!
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Old 03-13-2009, 07:33 PM   #2
Fongers
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Location: Beijing and Venice Beach
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2002 Built Wagon
Wife- 2004 Outback SE

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post a video so we can hear. does it only occur under load/boost? Good luck, sounds scary but rod knock does not go away, just gets worse.
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Old 03-13-2009, 07:58 PM   #3
ki11switch
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occurs randomly. Slow knock and goes kinda with the rpms
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Old 03-13-2009, 08:49 PM   #4
Fongers
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Wife- 2004 Outback SE

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might be an exhaust leak in the uppipe...
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Old 03-13-2009, 09:11 PM   #5
ki11switch
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Quote:
Originally Posted by Fongers View Post
might be an exhaust leak in the uppipe...
would that really sound like a knock?
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Old 03-13-2009, 09:54 PM   #6
jigga
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WRBlue Perl

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check your intercooler piping... might be coming loose and then tapping against the inner fender...
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