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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain. |
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01-22-2018, 02:12 AM | #1 |
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HELP needed to diagnose engine noise
Hey guys,
I started getting a strange engine noise the last few days under light acceleration. it sounds like a rattle of some sort but I can't narrow it down. I was hoping to see if anyone could recognize it and point me in the right direction to solving. I'll post it in a video, the sound is very obvious. I'm hoping I haven't done anything too serious. Thanks in advance. |
01-22-2018, 03:31 AM | #2 | |
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What, if anything, have you done to the engine within the last few days..?? Can you isolate the sound with a scope/rod/tube ..?? humfrz |
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The Following User Says Thank You to humfrz For This Useful Post: | Spuds (01-22-2018) |
01-22-2018, 04:27 AM | #3 |
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Thanks for your response. The metallic banging sound was what I was referring to. This is a new sound.
How would I isolate the sound? Would I hold a tube near certain parts of the engine and see if the sound is amplified? I changed my oil two weeks ago. That was the last thing I did to the engine. I noticed this sound when I returned from leaving my car at the airport for a day. It's middle of summer here if that helps. |
01-22-2018, 07:17 PM | #4 |
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bump
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01-22-2018, 10:44 PM | #5 |
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Are you sure it is not the wonderful sound of direct fuel injection? A few days after I got my car I had it towed with the 6 free months of subaru protection or whatever because I thought the engine was knocking. It makes a rattling noise when I lug the engine on a gentle take off. This is normal but was alarming for me
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01-22-2018, 10:52 PM | #6 |
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Crickets...
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01-22-2018, 10:55 PM | #7 |
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Yeah pretty sure. It got a lot worse today. Got a mechanic out who thinks I've spun a baring....i'll try get a second opinion.
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01-22-2018, 11:30 PM | #8 | |
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Dealer said rod knock. Didn't want to pay the $1875 for a tear down and another $3000+ for a new short block and install. I just ended up trading it in for a 2017 BRZ. |
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01-22-2018, 11:45 PM | #9 | |
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@humfrz is referring to a mechanics stethoscope. Touch the stick to different parts in the engine bay to see where it's the loudest. You might be able to identify which bank is the problem or maybe some other part like transmission, but since it's so loud it might not help. Or might deafen you... |
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The Following User Says Thank You to Spuds For This Useful Post: | humfrz (01-23-2018) |
01-23-2018, 12:03 AM | #10 | |
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They actually make store bought mechanics stethoscopes that can be used. Some just use a tube ...... making like its a sound tube. However, the FA20 engine is soo noisy, it would be difficult to isolate any one sound. Back-in-the day, I would have suspected something in the valve train is lose or out of spec. But here lately, the sound of a rod knocking (because of a spun bearing) seems to be the popular sound. If it's a rod knocking, the sound would be heard throughout the block, when scoped. A valve messing up could be isolated from one bank to another. Is there any way to disconnect the SC, and still get the engine to run, to see if the SC is making the noise ....?? Yep, a second hands on opinion would be in order. I hope it turns out to be minor. Please keep us posted. humfrz |
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The Following User Says Thank You to humfrz For This Useful Post: | Spuds (01-23-2018) |
01-23-2018, 12:18 AM | #11 |
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Is it an automatic?
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01-23-2018, 01:18 AM | #12 |
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The Following User Says Thank You to humfrz For This Useful Post: | Ultramaroon (01-23-2018) |
01-23-2018, 05:50 AM | #13 |
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knock knock.
Who's there? My only question is whether it is upper engine or lower engine. I'm not going to diagnose for sure from a YT video, but someone already diagnosed it in person. How is your AFR? Look at fuel trims too and do you have any CEL, what tune are you using? If the engine is running very lean it could be pinging, but most likely it is like that mecahnic said and a rod knock |
The Following User Says Thank You to guybo For This Useful Post: | Spuds (01-23-2018) |
01-23-2018, 07:36 AM | #14 |
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It's a manual guys. It was diagnosed in about 3 seconds. It got significantly worse since I first posted. Its Lower engine. Rattling BAD. I youtube 86 spun bearing noise after they diagnosed and it sounded the same. IL need to get it towed anywhere at this point forward so it will be hard to get second opinion. The mechanic came to me today which was way above and beyond.
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The Following User Says Thank You to Docmattic For This Useful Post: | Ultramaroon (01-23-2018) |
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