c63addix

Starting the past 3 days, my car's cold start has become quieter and weak. Before it sound really healthy and loud like "Vroooooooom!!!".. now its just like "Vroom..."

My cold start is about the same as a normal start up now This is quite bothersome because I want that obnoxious loud cold start back

Could it be engine problem? Everything is running fine, sounds normal in low/high speeds, sounds normal in regular start ups.. only the morning COLD start changed dramatically..

SonnyakaPig

It's called Summer.

c63addix

It's been pretty hot here in Vancouver since last month, so I dont think thats that issue thanks

Sincity

Ditto. OP is from Vancouver, BC, which to me is always winter.

SonnyakaPig

Hmm... I honestly don't know then. Cold start sound should be about oil temp and how long the car has been sitting. If everything else feels okay, not much you can do at this point.

SonnyakaPig

Haha! Yes, that would make sense. I didn't notice where OP was from on the mobile version I'm on.

Sincity

OP: If it is warmer than usual up there, then that is normal to have a less "ferocious" cold-start. I posted a thread about this 2 years ago.

c63addix

Hm, I hope that's the reason too, but it's been hot since last month, and my cold starts were still "ferocious" until 3 days ago. But I guess I shouldn't worry about it too much if my car is running properly?

COEHSP85

If your oil temp is still in the hundreds when the car starts its gonna be quiet..dont drive the car for 2 days and you will see a difference in noise when you start it..mine is the same way and we got 100F+ all the time

SonnyakaPig

I agree. But I find the cold start temp to be 80° F.

CoolBDPhenom03

Unless it's record-breaking hot, I don't think the weather is the issue. Here in the Bay Area, I could start my day in 100ºF heat and end my day in 50ºF evenings. I've had cold starts in both and I'd never had a "weird" issue (knock on wood).

When was your last service and did you do anything different since?

c63addix

Had an oil change 3 weeks ago, didn't do anything to the car. Just drive it hard everyday as usual

CoolBDPhenom03

What kind of oil did they use and was that different from the last oil change?

c63addix

Oh i have no idea, shame I never ask Mercedes what oil they use everytime i take it for oil change. I just assume they use Mobil 1 everytime

CoolBDPhenom03

Maybe you should just take your car to the dealership then to see if there are any codes. If not, then leave it overnight (or all day) so that they can see/hear the cold start for themselves.

COEHSP85

Dude its totally fine. I think if you let your
Car sit for 10 hours or more you will hear the rumble again from the cold start..Mine is the same way and still runs **** strong..if you wanna clean out your fuel injectors dump a can of seafoam in there to clean it up a bit..

driftmotion

how does the car feel otherwise ... i had the same issue ... i bought the car and when i first started it (OH HELLS YA I'M BUYING THIS!!!) now after owning the car for 3 months ... I noticed it's not as loud as the first month I owned it ... Good news is that it feels as strong as ever on the road ... and I could swear that yesterday it sounded normal again!!!

Sincity

I haven't had a loud cold-start in a month or so.

SonnyakaPig

Same here. At least a month.

CoolBDPhenom03

Umm...I set off my neighbor's Infiniti everyday...

ZephyrAMG

HAHA Of course you wouldn't. It would mean starting your car and turning it on!! You have like 2,000 miles on it and its an '09...lots of love though SIN

SonnyakaPig

Does your 09' start up in Sport mode after you turned the car off in Sport mode and when you drove it kind of hard?

CoolBDPhenom03

It does stay in Sport if I shut it off in that mode. Not sure what you mean about driving it hard...is it automatically supposed to do that?

go.mouse

I'm in Van. Cold start hasn't been as loud for the past few weeks.

driftmotion

.... ya especially with your stock exhaust