**Exhaust Smoke upon Third Start Up the Other Day. Causes?**
09-26-2011, 07:36 PM
#1
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**Exhaust Smoke upon Third Start Up the Other Day. Causes?**
I have a question to which someone will hopefully have the answer.
My C63 was sitting for 8 days. I came home and started it and drove it around for about 15 minutes (it got up to operating temperature). Then I shut it off for the night. The next day I started it up (it was ideling), but within 2 minutes I had to turn it off (I didn't put it in drive). I then started it up again for another minute or so (but again did not put in drive, it was just ideling...I kept having to run back inside my house).
Finally, an hour later, I went to start my car and it made a louder than normal sound and smoke was coming out of my exhaust pipes and the smoke stunk pretty bad. The smoke came out of the exhaust for about 10 seconds. Then it went away and has not returned since. This has never happend to me before.
What do you think caused the bad-smelling smoke? I would really appreciate the feedback. Thank you.
My C63 was sitting for 8 days. I came home and started it and drove it around for about 15 minutes (it got up to operating temperature). Then I shut it off for the night. The next day I started it up (it was ideling), but within 2 minutes I had to turn it off (I didn't put it in drive). I then started it up again for another minute or so (but again did not put in drive, it was just ideling...I kept having to run back inside my house).
Finally, an hour later, I went to start my car and it made a louder than normal sound and smoke was coming out of my exhaust pipes and the smoke stunk pretty bad. The smoke came out of the exhaust for about 10 seconds. Then it went away and has not returned since. This has never happend to me before.
What do you think caused the bad-smelling smoke? I would really appreciate the feedback. Thank you.
09-26-2011, 08:05 PM
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I knew those were relevant details, unfortunately it was at night and my best opinion of the color was thick white. The smell was like burnt rubber, kind of bitter.
I don't think the color had any blue in it.
I don't think the color had any blue in it.
09-26-2011, 08:44 PM
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'14 911S (garage queen) '13 X3 (family hauler)
My car has had smoke a couple of times, but never for ten seconds.
After the lifter and cam deal with our cars, I just figure anything is possible.
Fu<k, I'm waiting for fire to shoot out of this thing next!
Hopefully someone else can give you some actual helpful advice.
My guess is all of the starting and stopping had something to do with it!
Usually white smoke is condensation, no? But the smell, idk.
I always open my hood after I park the car in the garage (ocd, I know) and leave it open to cool the engine bay and all of the plastics, etc. Maybe you were smelling some plastic or rubber melting and the smoke was condensation. There is a sticker that melts on our exhaust as it comes loose--I pulled mine off a couple weeks after I got the car.
Just my guesses.
My car made the most God awful screeching noise (like a super rusty hamster wheel) a few weeks ago, who knows what's going on sometimes.
GL and keep us posted if it comes back.
After the lifter and cam deal with our cars, I just figure anything is possible.
Fu<k, I'm waiting for fire to shoot out of this thing next!
Hopefully someone else can give you some actual helpful advice.
My guess is all of the starting and stopping had something to do with it!
Usually white smoke is condensation, no? But the smell, idk.
I always open my hood after I park the car in the garage (ocd, I know) and leave it open to cool the engine bay and all of the plastics, etc. Maybe you were smelling some plastic or rubber melting and the smoke was condensation. There is a sticker that melts on our exhaust as it comes loose--I pulled mine off a couple weeks after I got the car.
Just my guesses.
My car made the most God awful screeching noise (like a super rusty hamster wheel) a few weeks ago, who knows what's going on sometimes.
GL and keep us posted if it comes back.
09-26-2011, 08:46 PM
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'11 C63 w/ P31
mine does it pretty often. to my knowledge just oil burning. My GT3 did it often too, most said it was due to the boxer engine and the way it lays, so oil would go into the exhaust then just burn up
09-26-2011, 09:01 PM
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My car has had smoke a couple of times, but never for ten seconds.
After the lifter and cam deal with our cars, I just figure anything is possible.
Fu<k, I'm waiting for fire to shoot out of this thing next!
Hopefully someone else can give you some actual helpful advice.
My guess is all of the starting and stopping had something to do with it!
Usually white smoke is condensation, no? But the smell, idk.
I always open my hood after I park the car in the garage (ocd, I know) and leave it open to cool the engine bay and all of the plastics, etc. Maybe you were smelling some plastic or rubber melting and the smoke was condensation. There is a sticker that melts on our exhaust as it comes loose--I pulled mine off a couple weeks after I got the car.
Just my guesses.
My car made the most God awful screeching noise (like a super rusty hamster wheel) a few weeks ago, who knows what's going on sometimes.
GL and keep us posted if it comes back.
After the lifter and cam deal with our cars, I just figure anything is possible.
Fu<k, I'm waiting for fire to shoot out of this thing next!
Hopefully someone else can give you some actual helpful advice.
My guess is all of the starting and stopping had something to do with it!
Usually white smoke is condensation, no? But the smell, idk.
I always open my hood after I park the car in the garage (ocd, I know) and leave it open to cool the engine bay and all of the plastics, etc. Maybe you were smelling some plastic or rubber melting and the smoke was condensation. There is a sticker that melts on our exhaust as it comes loose--I pulled mine off a couple weeks after I got the car.
Just my guesses.
My car made the most God awful screeching noise (like a super rusty hamster wheel) a few weeks ago, who knows what's going on sometimes.
GL and keep us posted if it comes back.
I also open the hood when I get home and park it if it's really hot outside.
I'll report back if I learn anything outside this thread.
09-26-2011, 09:02 PM
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Oh, okay, that's good to know. I mean, I don't like the fact that our cars smoke like this out the exhaust, but your explanation makes sense. Thanks.
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09-26-2011, 09:26 PM
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09-26-2011, 10:51 PM
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'11 C63 w/ P31
My car literally does it all the time. Car runs perfect. Actually happened at the dealer the other day now that I think about it, I pulled the car in and turned it off. One tech hoped in, turned it on to move it forward a bit and a bunch a smoke came out, one of the other techs I always talked to just smiled when it happened.
09-27-2011, 01:22 AM
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09-27-2011, 09:59 AM
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2012 C63;1971 280SE 3.5(Sold);2023 EQS 450 SUV 4 Matic (Wife's)
I think it was probably your cats loading up. You started the car twice in a short period of time but the cats never got hot enough to burn the emissions that they collect on them off. When you started the car for the third time the cats were not able to do their job and thus the smoke and the smell of burnt exhaust gasses. Did it smell like rotten eggs?
At cold start up the car is set to run richer as well and that just increases the job the cats have to do plus the fact that the cats take a while to get up to temperature to be effective increases the possibility of loading up the cats. Also the O2 sensors take a while to get up to temperature to begin to effectively adjust the AFR.
At cold start up the car is set to run richer as well and that just increases the job the cats have to do plus the fact that the cats take a while to get up to temperature to be effective increases the possibility of loading up the cats. Also the O2 sensors take a while to get up to temperature to begin to effectively adjust the AFR.
Last edited by Mort; 09-27-2011 at 10:07 AM.
09-27-2011, 04:18 PM
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I think it was probably your cats loading up. You started the car twice in a short period of time but the cats never got hot enough to burn the emissions that they collect on them off. When you started the car for the third time the cats were not able to do their job and thus the smoke and the smell of burnt exhaust gasses. Did it smell like rotten eggs?
At cold start up the car is set to run richer as well and that just increases the job the cats have to do plus the fact that the cats take a while to get up to temperature to be effective increases the possibility of loading up the cats. Also the O2 sensors take a while to get up to temperature to begin to effectively adjust the AFR.
At cold start up the car is set to run richer as well and that just increases the job the cats have to do plus the fact that the cats take a while to get up to temperature to be effective increases the possibility of loading up the cats. Also the O2 sensors take a while to get up to temperature to begin to effectively adjust the AFR.
09-28-2011, 11:39 AM
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EuroCharged 2012 C63 BS Coupè
I have a question to which someone will hopefully have the answer.
My C63 was sitting for 8 days. I came home and started it and drove it around for about 15 minutes (it got up to operating temperature). Then I shut it off for the night. The next day I started it up (it was ideling), but within 2 minutes I had to turn it off (I didn't put it in drive). I then started it up again for another minute or so (but again did not put in drive, it was just ideling...I kept having to run back inside my house).
Finally, an hour later, I went to start my car and it made a louder than normal sound and smoke was coming out of my exhaust pipes and the smoke stunk pretty bad. The smoke came out of the exhaust for about 10 seconds. Then it went away and has not returned since. This has never happend to me before.
What do you think caused the bad-smelling smoke? I would really appreciate the feedback. Thank you.
My C63 was sitting for 8 days. I came home and started it and drove it around for about 15 minutes (it got up to operating temperature). Then I shut it off for the night. The next day I started it up (it was ideling), but within 2 minutes I had to turn it off (I didn't put it in drive). I then started it up again for another minute or so (but again did not put in drive, it was just ideling...I kept having to run back inside my house).
Finally, an hour later, I went to start my car and it made a louder than normal sound and smoke was coming out of my exhaust pipes and the smoke stunk pretty bad. The smoke came out of the exhaust for about 10 seconds. Then it went away and has not returned since. This has never happend to me before.
What do you think caused the bad-smelling smoke? I would really appreciate the feedback. Thank you.
09-28-2011, 12:46 PM
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