loud noise when engine starts

[Guest matthew]

hi bros,

have a w204 every random days when going to work in the morning engine compartment will roar v loudly when put in key n start engine after engine runs for a few minute the loud noise will go away

no error msg

seem to be recurring

pls advise

[Guest blackmercs]

matthew wrote:

hi bros,

have a w204 every random days when going to work in the morning engine compartment will roar v loudly when put in key n start engine after engine runs for a few minute the loud noise will go away

no error msg

seem to be recurring

pls advise

Welcome!! Most of the bro here will love the roaring sound!! How old is yr ride? Pre-face lift model? If within warranty period just send it in for medical check up.

[Guest Sanjay]

blackmercs wrote:

Welcome!! Most of the bro here will love the roaring sound!! How old is yr ride? Pre-face lift model? If within warranty period just send it in for medical check up.

mate... usually if the car is a few years old.. the V-belt and related parts may need replacement and this can be the cause of the irregular sound.. you may have also noticed higher fuel consumption etc.. take it to a reputable garage and ask them to give the car a once over and advise you of parts that need to be changed.. nothing to be alarmed... but a broken v-belt will mean a costly repair... sort it out before that happens

[Guest Clear Vision]

matthew wrote:

hi bros,

have a w204 every random days when going to work in the morning engine compartment will roar v loudly when put in key n start engine after engine runs for a few minute the loud noise will go away

no error msg

seem to be recurring

pls advise

I interpret above message as only random days, the engine will roar very loudly when starting in the morning. I have the same situation too.....my car is 2 1/2 yrs old. Didnt do anything to it as i guess at times, the fuel is too "rich" and "too much" being injected during morning starts. I dont step on the accelarator or anything like that before i start car. Just insert key and turn...

[Guest io5885]

How old is ur ride? wats the mileage like?

If u only drive the ride every random days, then ur ride is crying for attention from u to sayang it more often. :becky:

If u leave ur ride untouched for more than 24hrs, its just warming up and the tachno meter shld be ard 1000 rpm during cold start.

symptoms differ accordingly to health conditions..

To me, its just music to the ears.. :music:

[Guest hkhamateur]

Clear Vision wrote:

I interpret above message as only random days, the engine will roar very loudly when starting in the morning. I have the same situation too.....my car is 2 1/2 yrs old. Didnt do anything to it as i guess at times, the fuel is too "rich" and "too much" being injected during morning starts. I dont step on the accelarator or anything like that before i start car. Just insert key and turn...

matthew wrote:

hi bros,

have a w204 every random days when going to work in the morning engine compartment will roar v loudly when put in key n start engine after engine runs for a few minute the loud noise will go away

no error msg

seem to be recurring

pls advise

Yo bro Matthew, a warm :peace: :welcome:

Few bros here (Sanjay, Blackmerc, io5885) advices u hve to take note of. It cld happen! :hand:

Fm my understandg, I shld b cold start symptom n quite common fr all brands! :becky:

If oni u ve tried cold start a diesel vehicle, u'll b shocked to learn tat e roarg re even louder than! Like Jurassic Park Dinosaurs Comg! :peep:

Fr a peace of mind, get yr SA n their technician to check on yr worries! :whistle:

[Guest hannson]

It all starts with the o2 sensors.

In modern cars, the o2 sensors start to operate only at a certain temperature.

At cold start, the current to heat the o2 sensors need about a minute to get the o2 sensors to operating temperature.

During this time, the car is operating in Open Loop from Fueling perspective, based on the ECU map.

This is the same map/configuration that the car uses if your o2 is kaput. i.e. the car will still run, but not as efficiently.

For other technical info, feel free to drop by my in-house clinic @ http://www.sgmerc.com/forums/forumdisplay.php?f=90 LOL .. although some say it has more poison than medicine...

[Guest io5885]

so to say, if after a min, ride still roaring away means o2 kaput liao huh, Doc?

is it "healthy" for the ride to roar randomly?

On the other side, is it "healthy" for the ride to "teck teck teck" after shutting down the engine?

TIA.. :wave:

hannson wrote:

It all starts with the o2 sensors.

In modern cars, the o2 sensors start to operate only at a certain temperature.

At cold start, the current to heat the o2 sensors need about a minute to get the o2 sensors to operating temperature.

During this time, the car is operating in Open Loop from Fueling perspective, based on the ECU map.

This is the same map/configuration that the car uses if your o2 is kaput. i.e. the car will still run, but not as efficiently.

[Guest C350]

io5885 wrote:

so to say, if after a min, ride still roaring away means o2 kaput liao huh, Doc?

is it "healthy" for the ride to roar randomly?

On the other side, is it "healthy" for the ride to "teck teck teck" after shutting down the engine?

TIA.. :wave:

Ai Yo Ivan teck teck teck good cause they used metal to build your car ma. if no sound than scare kekekeke....:becky::becky::becky: just kidding better wait for doc to answer your question hee......

[Guest io5885]

Bro Anthony,

Dun scare me leh...

No sound like go liao..

but got sound oso scare.

Like got things wan to spoilt liao.

Sound? No sound? Loud sound? simi sound? :music:

Doc!!! Where R YOUUUUUU!!?!?!?!?! :pound:

C350 wrote:

Ai Yo Ivan teck teck teck good cause they used metal to build your car ma. if no sound than scare kekekeke....:becky::becky::becky: just kidding better wait for doc to answer your question hee......

[Guest hkhamateur]

io5885 wrote:

Bro Anthony,

Dun scare me leh...

No sound like go liao..

but got sound oso scare.

Like got things wan to spoilt liao.

Sound? No sound? Loud sound? simi sound? :music:

Doc!!! Where R YOUUUUUU!!?!?!?!?! :pound:

Bros Anthony/ Ivan, you guys has scare our Doc away liao lar! :Cry:

Wat tak tak teck, wat got sound below abv behind beside..etc...7th mth long over lor! :fear: :peep:

[Guest hkhamateur]

hannson wrote:

It all starts with the o2 sensors.

In modern cars, the o2 sensors start to operate only at a certain temperature.

At cold start, the current to heat the o2 sensors need about a minute to get the o2 sensors to operating temperature.

During this time, the car is operating in Open Loop from Fueling perspective, based on the ECU map.

This is the same map/configuration that the car uses if your o2 is kaput. i.e. the car will still run, but not as efficiently.

For other technical info, feel free to drop by my in-house clinic @ http://www.sgmerc.com/forums/forumdisplay.php?f=90 LOL .. although some say it has more poison than medicine...

Doc, nicz...explanation! :thumb:

Hope its understood clearly otherwise gotta get Wes to simplified lor! :wave:

[Guest Wes23]

hkhamateur wrote:

Doc, nicz...explanation! :thumb:

Hope its understood clearly otherwise gotta get Wes to simplified lor! :wave:

Why me? Simplified? As in lay man terms??? Haha...

[Guest skid]

hkhamateur wrote:

Doc, nicz...explanation! :thumb:

Hope its understood clearly otherwise gotta get Wes to simplified lor! :wave:

yeah going to experience this Doc's treatment soon! :bounce::bounce:

but once you start you keep going back for more!

[Guest matthew]

blackmercs wrote:

Welcome!! Most of the bro here will love the roaring sound!! How old is yr ride? Pre-face lift model? If within warranty period just send it in for medical check up.

hello is a pre fl june 2009 merc c180k 2.5 years is pre owned by another friend

notice the sound only recent of late i think my neighbours who were going to work freaked at the roaring engine sound

does merc need to warm up engine before moving off ie: like 5-10 mins

could it be i always rush to work w/o warming up thus the cause ?

sorry bros i m new to merc

[Guest skid]

matthew wrote:

hello is a pre fl june 2009 merc c180k 2.5 years is pre owned by another friend

notice the sound only recent of late i think my neighbours who were going to work freaked at the roaring engine sound

does merc need to warm up engine before moving off ie: like 5-10 mins

could it be i always rush to work w/o warming up thus the cause ?

sorry bros i m new to merc

i noticed lots of mercs have this super loud sound in the morning not only unique to c class. anyway don't need to warmup just start engine and drive off. the engine is warmed up once u see the temp hit 90 deg.

[Guest blackmercs]

matthew wrote:

hello is a pre fl june 2009 merc c180k 2.5 years is pre owned by another friend

notice the sound only recent of late i think my neighbours who were going to work freaked at the roaring engine sound

does merc need to warm up engine before moving off ie: like 5-10 mins

could it be i always rush to work w/o warming up thus the cause ?

sorry bros i m new to merc

Hi since is still under warranty just send it for medical check up. My previous ride with the same engine does not generated such a loud noise.

Nopey u don't have to warm up yr car in the morning. Those are old school techniques.

[Guest allen69]

Many have mention that C180k engine noiser then the CDI version, I am curious noisy at which stage? When the engine sound louder even when car at stationery or when we ramp the car at a certain rpm, the engine noise can be heard louder when we inside the car? Hope some bro here can answer my curiousity. thanks.

[Guest blackmercs]

allen69 wrote:

Many have mention that C180k engine noiser then the CDI version, I am curious noisy at which stage? When the engine sound louder even when car at stationery or when we ramp the car at a certain rpm, the engine noise can be heard louder when we inside the car? Hope some bro here can answer my curiousity. thanks.

C180k hv CDI model? Is diesel model rite?

[Guest allen69]

blackmercs wrote:

C180k hv CDI model? Is diesel model rite?

OH sorry i mean comparing C180 Kompressor model with their elder bro example C180 CGI or C200 CGI. As I search through this forum and many have mention that the kompressor engine is noiser then CGI but no one have mention what they mean by noiser? Do they mean that the engine sound louder when we stand beside the engine or when the car is moving etc ? ...

[Guest jchoo]

good info bros. thanks!!

[Guest subaru67]

maybe its the Kompressor belt sound as its a common prob with c-class K.

my cgi also have loud startup in the morning esp since exhaust done...

hahahaha my subaru even louder... whole basement can hear my sound only but once warm up than ok liao