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      07-17-2009, 01:31 AM   #1
niqui
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Sizzling Sound?

Has anybody noticed a sizzling sound coming from the front end of the car after a drive, after turning off the car. There will be 3-4 noises emitted by the car that sound like dropping water in a really hot plan...I noticed this a while back on my car, and popped the hood and saw nothing out of the ordinary. No smell.
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      07-17-2009, 01:48 AM   #2
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Quote:
Originally Posted by niqui View Post
Has anybody noticed a sizzling sound coming from the front end of the car after a drive, after turning off the car. There will be 3-4 noises emitted by the car that sound like dropping water in a really hot plan...I noticed this a while back on my car, and popped the hood and saw nothing out of the ordinary. No smell.
If the coolant levels are fine and the car isn't overheating and there's no "sweet" smell (which would be indicative of coolant) then it doesn't sound like the cooling system....

The only thing I can think of is condensation from the A/C hitting something hot on the engine or exhaust system--but usually that drains under the car and not into the engine bay. Does this happen when using the A/C and not when the A/C isn't used?

I'm sure there are others here with more knowledge than I will offer up some suggested checks. There's always the dealer if this is something that's consistent and repeatable....
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      07-17-2009, 01:50 AM   #3
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Condensation dripping onto the exhaust...happens to mine all the time.
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      07-17-2009, 03:46 AM   #4
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prob hearing the breaks, they make popping sounds when hot
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      07-17-2009, 03:47 AM   #5
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Atypical of an M3 in humid and/or hot weather
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      07-17-2009, 07:26 AM   #6
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Originally Posted by bdh2009 View Post
Atypical of an M3 in humid and/or hot weather
Mine does it some of the time.
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      07-17-2009, 07:28 AM   #7
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Quote:
Originally Posted by powertrip View Post
Condensation dripping onto the exhaust...happens to mine all the time.
Yep, same happens to me. No worries.
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      07-17-2009, 07:31 AM   #8
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It happens everyday..don't worry, just the A/C condensation dripping on the exhaust...
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      07-17-2009, 07:46 AM   #9
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Quote:
Originally Posted by powertrip View Post
Condensation dripping onto the exhaust...happens to mine all the time.
+1

(has already been identified / discussed in a previous thread)
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      07-17-2009, 08:20 AM   #10
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Funny...I was wondering the same thing. I get both the sizzling and the brake pops...glad it is nothing...didn't really think it was.
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      07-17-2009, 08:30 AM   #11
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pop the bonnet and check for eggs and bacon
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      07-17-2009, 08:36 AM   #12
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Quote:
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pop the bonnet and check for eggs and bacon
That made me laugh! He said there was no smell so probably no bacon.
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      07-17-2009, 08:44 AM   #13
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Yep, condensation drainage from AC is hitting the exhaust. The best thing to do is pull off the panel under the trans and either reroute the drain line or add another length of hose to make it drain somewhere NOT over the exhaust.
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      07-17-2009, 09:07 AM   #14
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Quote:
Originally Posted by John@BMW View Post
Yep, condensation drainage from AC is hitting the exhaust. The best thing to do is pull off the panel under the trans and either reroute the drain line or add another length of hose to make it drain somewhere NOT over the exhaust.
Does it hurt anything if we don't? I'm in Houston, TX, so we have extremely hot/humid weather and I get the sizzle even if I'm making my ~5 minute drive to work. The sound from mine sounds like it's coming from the front passenger side...
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      07-17-2009, 09:51 AM   #15
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Quote:
Originally Posted by gr8000 View Post
+1

(has already been identified / discussed in a previous thread)
+2

No need to worry as it is normal.
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      07-17-2009, 10:49 AM   #16
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Bacon bacon bacon! I smell bacon...
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      07-17-2009, 12:02 PM   #17
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Um, my guess is that would be condensation dripping on the exhaust...
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      07-17-2009, 02:41 PM   #18
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Quote:
Originally Posted by themetz View Post
pop the bonnet and check for eggs and bacon
Perhaps this is the source of the noise:
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      07-17-2009, 03:37 PM   #19
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Every car I've owned has done this, condensation sizzles when dripping into something in the engine compartment that's hot.
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      07-17-2009, 04:19 PM   #20
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Totally normal. Brought up many times before.
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      07-17-2009, 05:20 PM   #21
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This is fairly common in all types of cars when operating under normal condition. I mean, something has to sizzle like sizzlers when its hot!
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      07-17-2009, 08:20 PM   #22
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"Mmmm....bacon....gwuuuaahhh"

My car also sizzles almost every time I drive, too. I was always wondering what that was. I guess now I know!
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