Lots of smoke from engine bay after short drive
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W204 C63
Lots of smoke from engine bay after short drive
Hi. I’ve had a problem going on for a couple weeks with a high pitch sound that I think is some perished ventilation valve thats not really a problem besides the irritating noise so I’ve pushed an appointment to a shop until I get my other car running in a week or two but today running to the store, a 5 minute drive, and looking back at the car I see that there’s some smoke, looks like vapor and didn’t smell like oil that dropped on a manifold or something. It was on the drivers side(lhd). As I don’t know much about these cars yet I thought I could see if there’s anything likely to cause this on the lhd, deep down in the engine bay. I may have to take it to a shop sooner than I planned?
Best regards,
trester
Best regards,
trester
Last edited by Trester; Jun 4, 2021 at 02:21 PM.
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2012 P31 C63 Coupe Trackrat, 2019 GLE63S Coupe Beast
PCV valve
Could also be intake manifold gasket leak, although that wouldn’t cause smoke.
Maybe both. Or valve cover could be leaking oil on manifold.
Could be many things, need to dig in.
Could also be intake manifold gasket leak, although that wouldn’t cause smoke.
Maybe both. Or valve cover could be leaking oil on manifold.
Could be many things, need to dig in.
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W204 C63
It really seemed like water vapor, it didn’t smell and it was not heavy smoke like burning oil would cause but there was a fair amount of it and it kept coming for minutes after. I’ll get it diagnosed for sure by a professional soon but maybe I could learn something here first.
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W204 C63 Coupe, W166 ML350 BlueTEC, 928GT, Taycan GTS Sport Turismo, C5 Z06 & IS300 race cars
Whatever fluid it is it - and it most likely is engine oil - appears to be hitting the hot exhaust manifold. My guess would be on the valve cover gasket (reasonably common and fortunately not too expensive to replace).
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W204 C63
Okay so I’ve been driving my E36 for a couple days but decided to look into my smoking C63 this morning. I first removed the air box to inspect and try to confirm a leaking valve cover but I didn’t find anything so I reinstalled everything and fired the car up.
immediately there was smoke coming from the back of the engine, it came out mostly on the drivers side but definitely from back of engine and not from oil burning on manifold since this was seconds after starting the car and everything was cold still.
the dentist drill sound also came on immediately so this is caused by a bad PCV valve and not the fan that's supposed to come on at high temperatures thats been suggested in another thread about that issue.
Can a bad PCV valve also cause smoke?
immediately there was smoke coming from the back of the engine, it came out mostly on the drivers side but definitely from back of engine and not from oil burning on manifold since this was seconds after starting the car and everything was cold still.
the dentist drill sound also came on immediately so this is caused by a bad PCV valve and not the fan that's supposed to come on at high temperatures thats been suggested in another thread about that issue.
Can a bad PCV valve also cause smoke?
Last edited by Trester; Jun 28, 2021 at 11:04 AM.
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2013 Mercedes C63 AMG
Sounds like the PCV valve is faulty from what I hear. You can troubleshoot this by removing opening the dipstick and seeing if the sound goes away.
Your intake is probably swimming in oil, I hope not. I'd remove the intake manifold as well to clean out any excessive oil.
Others will hopefully give you better info to go by.
Your intake is probably swimming in oil, I hope not. I'd remove the intake manifold as well to clean out any excessive oil.
Others will hopefully give you better info to go by.
Last edited by Slow_c63; Jun 28, 2021 at 11:54 AM.
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2020 E 300 Coupe and 2019 GLS 400
The loud whistling noise could indicate a large vacuum leak. Also, smoke appears more on the driver's side far from the PCV valve. It might be an issue with the brake booster connection to the intake manifold (or the purge valve connection but it is pre-vacuum so not sure)
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I have the drivers side hairline crack also and leak near the rear bottom and exhaust manifolds will get hot in seconds after starting the car.
