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06-27-2022, 02:17 AM
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#1 |
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Scooby Newbie
Member#: 530516
Join Date: Jun 2022
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Knocking or tapping sound on cold start, goes away after driving, video attached
Hi,
for the past year or so, my 2003 WRX (blob eye /w AVCS AUDM) has had an issue where on a cold start, it will make a knocking sound which sounds like its from the left side of the engine. After idling for a little bit, driving a few hundred meters, then stopping and starting the car it goes away. I believe it also goes away on its own without restarting the car if given a little while longer. There sounds almost like a belt squeal sometimes as its restarted as the issue fixes itself. The car then drives normally once its been restarted. Here's a video of it: I also noticed today the crank pulley appears to be slightly wobbly, however i'm not sure what's normal. The video appears to stabilise the movement somewhat, it looks more pronounced in person. The timing belt was only done around 10,000 KM ago, I think it was before this started. My theories are: crank has being worn down loose timing chain tensioner failing cam gear pulleys (as these were not replaced with the timing belt, mechanic said this particular model of ej205 had pulleys which always strip when being removed and advised that it's usually fine to not do them if they're not leaking, which they weren't). dying AC compressor somehow causing issues? early failure signs of oil pickup? I'm really just guessing wildly here. The motor itself is the ej205 with AVCS, has a few bolt on modifications I've done over the years, mostly before this started. Original motor the car came with, 250,000 KM and change. Car was e-tuned, I think by boosted performance? It was some famous forum e-tuner. STI injectors 255 walbro fuel pump silicone turbo inlet triple pass mishi radiator MAC 3 port EBCS 3 inch TBE (x-force varex) 3 port catch can after the noise started - process west tmic There may be a few other things to I'm nothing of. Anyway, does anyone have any ideas for what issue this may be, or what I should do about it? The car runs great once warm. I do drive it pretty hard but I'm generally pretty careful with letting it warm up first. I'd like to prevent any catstrophic engine failure if that's what this noise would suggest will come.
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06-27-2022, 11:05 PM
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#2 |
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Scooby Newbie
Member#: 530516
Join Date: Jun 2022
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it doesn't do this every day either
just started it and drove a few minutes, there was no knocking sound it seems to be more likely to occur the longer the car sits without being driven, and i do drive it most days |
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06-27-2022, 11:05 PM
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#3 |
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Scooby Newbie
Member#: 530516
Join Date: Jun 2022
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it doesn't do this every day either
just started it and drove a few minutes, there was no knocking sound it seems to be more likely to occur the longer the car sits without being driven, and i do drive it most days |
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06-27-2022, 11:13 PM
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#4 |
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Scooby Specialist
Member#: 110078
Join Date: Mar 2006
Location: Long Island N.Y.
Vehicle:02 Bugeye JDM STi OBP BLACK |
You may want to test the timing belt tensioner, there a vid on YouTube that shows how to test.
Sent from my iPhone using NASIOC |
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06-28-2022, 01:06 AM
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#5 | |
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Scooby Newbie
Member#: 530516
Join Date: Jun 2022
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Quote:
I'll try it later this week or on the weekend. |
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06-28-2022, 02:19 AM
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#6 | |
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Scooby Newbie
Member#: 530516
Join Date: Jun 2022
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Quote:
I'll try it later this week or on the weekend. |
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01-03-2025, 01:31 PM
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#7 |
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Scooby Newbie
Member#: 539929
Join Date: Jan 2025
Location: Oregon
Vehicle:03 WRX Black |
I know this thread is pretty dead at this point, but I was wondering if you ever found the cause of this noise. My 03' with a JDM AVCS motor makes a similiar noise on cold startup and I was curious if you found a solution.
Thanks |
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