ShaneN.

I had injectors, spark plugs, weistec catch can and an oil change with 2 cans of ceratec all done today at my trusted indy (a friend who used to work at mercedes). The shop did a nice clean install, zip tied up all the hoses, everything looks good. About 45 mins after leaving the the shop I hear what sounds like someone vaccuming their car in the parking lot beside me. I pull into a strip mall and as I'm driving past stores I can hear the sound bouncing off the windows... it's me. I pulled over and recorded the below video. It legit sounds like a loud household vacuum, much louder than my fans or anything. I turned off the car and it stopped. I went shopping for 5-10 mins, came back out and it didnt make the sound again upon startup. I called the shop and he wanted me to undo the oil cap to see if the sound stopped and/or if the cap was suctioned on really hard - but the noise had stopped when I came back out to try.

Also, is it normal for the actual catch can to be really hot to the touch? I won't have any hot oil in it yet but I assume hot air circulates through it so that's likely normal? I was monitoring my oil temp gauges and my temp was a bit higher than normal at 110C but doing a quick search on here that seems normal when running in manual mode for whatever reason, and I happened to be in manual mode in stop and go traffic - so I don't think temp was any higher with the can or anything. Not that it should be. Anyways, anyone know what on earth this sound was?

Turn your sound up, the video knocks down the volume level a bit. You can tell it's much louder than my injectors/valvetrain:

Hood closed:

Hood open:

chrisridebike8

BLKROKT

ShaneN.

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Is that different than the fans that would stay on after I turn off the car? It's louder than a typical electric fan sound, the video doesn't really show how loud it was. It also stopped when I shut down the car and I wasn't even driving the car hard at all (was in traffic), plus it was only about 23C outside. I've never heard my car make that sound, ever. The sound didn't really sound like a fan, more like a super loud house hold vacuum noise is the best way to describe it. I just went and ripped around for an hour and didn't hear it again and the temp outside is the same.




I wonder if maybe it's just from the heat under the hood. when I was looking around for where the sound was coming from I kind of just laid my hand on the top of it and it was rather hot. I can make a video of exactly where they go in the morning, but is there really a way to screw up where they go? I supplied the instructions and a link to the board talking about being careful around the vac line fitting. Or do you mean maybe the hoses are rooter too close to the exhaust manifold? I'll attach a quick little video I put on my IG story, but in the morning I'll take more detailed pics for you too.

G_Money

You certainly have a.. verbose style of writing...

How long have you had your car? Have you driven it in the heat before? These cars make a lot of noises that might otherwise sound weird were they coming from different cars. If you said it didn't come back and it didn't affect driving in any way, I wouldn't worry too much.

chrisridebike8

m a x i m u s

Lol, Chris. No one ever believes me either when I post. As for the hot catch can, mine gets hot too. I always thought it was getting hot because it's next to the hot engine. Everything in my engine bay gets hot.

ShaneN.

LOL I've noticed I do that on this forum too when I'm trying to describe stuff, I keep having to go back and edit where I've repeated myself - just trying to describe as well as possible. Had it 9 months. I've driven it in hotter weather than 23c and harder, that's why it seemed weird it came on. I was in manual in heavy traffic though. It just seemed weird it was right after all that work.
My bad if it came off that way but I didn't not believe you, I'm on here asking opinions on a car I'm still not familiar with cuz I know you guys know these things. I was just trying to make it clear that it didn't sound like a fan and wasn't that hot or driven hard , in my described verbose-y way, to see if that's still what you figured it was. Lol. That's exactly where it was coming from though, right at the front there. What an embarrassingly loud noise.

ShaneN.

I figure that's maybe what it is given that is aluminum (I think) trapped in a hot engine bay. I guess I just didn't expect that, but even my hood was warm to the touch at that point too. As long as you guys think those hoses aren't routed where they're too close to anything too hot then I'm not too worried about it.

1Lop2K5C

Well wouldn't it make sense that the catch can get really hot? Its circulating oil vapor from the crank right?

ShaneN.

At first im thinking well there has got to be no hot oil in it yet but yes, I think you're right? To be honest I don't even know how they really work.
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​​​​​​On a side note, ceratec wouldn't make the oil run a few degrees higher would it ?

Honro

Totally normal sound. As mentioned, your oil got hot thus the aux oil cooler kicked in. Nothing to worry about.

Nope, not at all. That would just be your driving, especially if your in manual mode!

chrisridebike8

BLKROKT

m a x i m u s

I assume you don't have a CEL?

ShaneN.

I turned 34 today, so now I'm the big kid who never stops asking questions
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Nope. Went out tonight and actually ripped around in the car, maxed the temp a degree or two higher at 113f, no fan. Oh well it's clearly not a big deal, just seemed weird I'd never had it come on before especially given I was just stuck in traffic.