Car's normal RPM during startup

[Whiteraven]

Hello Guys,

I'm a first time car owner, need some help on some RPM thingy.

During a cold engine startup, my car's RPM ramped up to about 1500rpm and stayed there until i shifted the gear from P to D.

I was waiting for the blue cold light to go off before my drive.

Is this normal? Just collected my car btw.

Thanks in advance.

[alangohek]

Hello Guys,

I'm a first time car owner, need some help on some RPM thingy.

During a cold engine startup, my car's RPM ramped up to about 1500rpm and stayed there until i shifted the gear from P to D.

I was waiting for the blue cold light to go off before my drive.

Is this normal? Just collected my car btw.

Thanks in advance.

It's normal. Mine rev to around 1600. Not necessary to wait for the blue light to go off before driving off.

Normally I will wait for around 20 secs before drive off. By then the RPM should drop to around 1200 - 1400 RPM. This 20 secs allows the engine oil to "circulate". When the blue light is on, I will drive like a tortoise. Haha =)

[gh05tss]

Hello Guys,

I'm a first time car owner, need some help on some RPM thingy.

During a cold engine startup, my car's RPM ramped up to about 1500rpm and stayed there until i shifted the gear from P to D.

I was waiting for the blue cold light to go off before my drive.

Is this normal? Just collected my car btw.

Thanks in advance.

Very normal..no worries about if.

BTW, welcome to The Latio Club and enjoy your ride.

[Zippy]

It's normal. Mine rev to around 1600. Not necessary to wait for the blue light to go off before driving off.

Normally I will wait for around 20 secs before drive off. By then the RPM should drop to around 1200 - 1400 RPM. This 20 secs allows the engine oil to "circulate". When the blue light is on, I will drive like a tortoise. Haha =)

Yup! Same here. When blue light is on, i slowly crawl down my MSCP without touching the accelerator... 

[Whiteraven]

Thanks for the replies guys~ 

[iagree]

Hello

I think is abt 2000rpm but it shld be hitting that rpm for abt 1 to 2 seconds after you startup, then it will reduce to abt 1500rpm.

[clarence]

When engine is cold, rpm metre is higher (ranges from 1,000rpm to 1,600rpm, depending on car model) as all cars are electronically tuned to have higher rpm during cold start to warm up the engine.

When engine has reached optimium operating temperature, which is about 5 mins after you start your engine, rpm at idle should be 800rpm for optimium fuel economy.

If your engine is already warmed up and the rpm is above 800rpm at idle, it is drinking more petrol than necessary.

[iagree]

When engine is cold, rpm metre is higher (ranges from 1,000rpm to 1,600rpm, depending on car model) as all cars are electronically tuned to have higher rpm during cold start to warm up the engine.

When engine has reached optimium operating temperature, which is about 5 mins after you start your engine, rpm at idle should be 800rpm for optimium fuel economy.

If your engine is already warmed up and the rpm is above 800rpm at idle, it is drinking more petrol than necessary.

Hi clarence

iagree with u.

1) 2000rpm+ when start in the morning
2) 1 to 2 seconds after, it will reduce to 1500rpm + -
3) 1 to 2min later (before we drive off the car), it will maintain at around 800 rpm.

Regards.

[kanzo]

think if u start ur car withthe air con running, teh rpm will be slightly higher coz the compressor sapping lotsa power.. engine need to work harder

[clarence]

Yes, engine will also be noisier and fuel gauge needle drops faster too.

You will notice lack of power when driving off during cold start with air con turned on.

[iagree]

think if u start ur car withthe air con running, teh rpm will be slightly higher coz the compressor sapping lotsa power.. engine need to work harder

Hi kanzo

I have the same +ve habit , i.e. to off the aircon, off the lights, off the radio+players before i switch off the engine. the rpm shld be normal. good ones u hv share out. thanks.

Yes, engine will also be noisier and fuel gauge needle drops faster too.

You will notice lack of power when driving off during cold start with air con turned on.

Hi clarence,

Good idea. I always drive for abt 2km to 3km before i switch on the aircon. When i switch on the aircon, it has a "shnggg" sound... like farttting...

Regards.

[arias48]

Hi kanzo

I have the same +ve habit , i.e. to off the aircon, off the lights, off the radio+players before i switch off the engine. the rpm shld be normal. good ones u hv share out. thanks.


Hi clarence,

Good idea. I always drive for abt 2km to 3km before i switch on the aircon. When i switch on the aircon, it has a "shnggg" sound... like farttting...

Regards.

I've the sound too.

[clarence]

That sound when you start the air con should benormal but if it persists after your air con is turned on, then there are some faults with your air con.

Some Lations here experienced this problem, sent their Latios bk to Tan Chong and got  their air con compressor replaced.

[iagree]

I've the sound too.

Hi arias,

I noticed, if you drive for longer distance before you switch on the aircon, the 'shnnng' snd is very very soft.... almost cannot hear it.... Try to drive until the car is fully warmed up... may be 3 to 5 km after u drive off ?

Regards.

[arias48]

Hi arias,

I noticed, if you drive for longer distance before you switch on the aircon, the 'shnnng' snd is very very soft.... almost cannot hear it.... Try to drive until the car is fully warmed up... may be 3 to 5 km after u drive off ?

Regards.

Okay, will try that. But I usually turn on the aircon in MSCP, so the sound is very obvious in the enclose MSCP. If I drive 3 to 5 km away, I'll probably ended up on the main road, more noises from the surroundings, maybe hard to hear the sound. But anyway I will try that. THX.

[iagree]

Okay, will try that. But I usually turn on the aircon in MSCP, so the sound is very obvious in the enclose MSCP. If I drive 3 to 5 km away, I'll probably ended up on the main road, more noises from the surroundings, maybe hard to hear the sound. But anyway I will try that. THX.

Hi arias,

Close all windows b4 u switch on the aircon,  u will be able to hear clearly.
You will feel a great diff.
No worry, i tested before. An extensive UAT has been done by me for this issue :)

[arias48]

Hi arias,

Close all windows b4 u switch on the aircon,  u will be able to hear clearly.
You will feel a great diff.
No worry, i tested before. An extensive UAT has been done by me for this issue :)

How many users have sign-off ur UAT?  Will try that and feedback, thx...

[iagree]

How many users have sign-off ur UAT?  Will try that and feedback, thx...

Hi arias,

4 Senior Manager + 1 MD + 1 DMD had signed off the UAT.
It's proven and workable in production environment.

Cheers.
-iagree

[LatioR]

Hi arias,

4 Senior Manager + 1 MD + 1 DMD had signed off the UAT.
It's proven and workable in production environment.

Cheers.
-iagree

Hi iagree, what's UAT (sorry as it's new to me)? U r in production line? If yes, what kind of mfg u r in?

[iagree]

Hi iagree, what's UAT (sorry as it's new to me)? U r in production line? If yes, what kind of mfg u r in?

Hi LatioR,

Ha ha.

I am in IT (Computer).

UAT = User Acceptance Test
Production = Live system environment

User performs extensive testing and then launch it (to live) and that is in the Production environment. Meaning launched for user to user liao, no longer under Testing environment.

Just to add another sentence to the above so that it is not out of topic? :)

Nowadays, i always drive for abt 3 to 4KM before i switch on the aircon, the 'shng' noise is very light... (almost NIL).

Regards.