Low idle rpm

calfskin SG

there were on more than one instance, where I stop at traffic lights for example, that the idle rpm drops to the 500-600 rpm region for a split second or so. So much so that it feels that my car shakes a little and feel like "Si Chia". After that, rpm will resume to normal.

I'm driving a manual (not auto), and i usually free the gear and not stepping on clutch, brake or accelerator when i stop at traffic lights.

I don't think the the "dangerously" low rpm is normal. What could be the possible causes, and its resulting consequences?

Any car experts willing to share with me? Very worried now that it could be something major. Shocked

ceecookie SG

like this means almost stalll????

calfskin SG

yes, but the key word here is "ALMOST". It almost feels like stalling for a split second or so, but didn't.

Any one? Shocked

ceecookie SG

u should ask Prae111…he’s the expert…...or i think ur clutch something wrong?

Lancer947 SG

I think it is normal, I also encounter this issue.

It is apply to both auto and manual car. As long as your air-con is switch on, the rpm fluctuate due to the air-con compressor turning on.

Try this, stop at the traffic without the air-con on, see if you face this problem? But it would be uncomfortable.

To prevent this, you may have to adjust the idle speed to higher which would waste more fuel!

Cool

LittleTiger SG

What is your ride?

Its is normal for proton to have this problem... especially the Multi Point Injection.

ceecookie SG

auto car also have….my father car i ever felt the rpm drop and then resume to normal…...anyway dont worri…wont spoil liao…

calfskin SG

I just got a new Mit Lancer 1.6 MT. Less than a month old, and just did the 1k servicing.

Also, the car feels a bit laggy now. It feels like i'm driving with the handbrake on, even though I'm very sure it isn't engaged in anyway.

SBS3624G SG

Sounds quite normal for rpm to fluctuate now and then. The LO3X (bus) is liable to fluctuate till the needle looks a blur, when it rests.

Praetorian111 SG

Is the RPM fluctuation only after your 1K?? What did you change during your 1K servicing?? Did you smell anything or hear any sound since you stated that there was a loss of power.

Cheers

calfskin SG

Ermm....not the the idle RPM swings up and down wildly, just tat once in awhile, it drops to about 300 rpm and car wobbles for a spilt second or so and then idle rpm resumes to normal.

I experienced it before and after the 1k servicing, so I don't think its the servicing problem. For 1k servicing, only my engine oil and filter is changed. the rest of the stuff are just checks and inspects.

I didn't smell or hear anything unusual.

Is my experience 'normal'? Idea

Praetorian111 SG

should not be a problem, as stated by others it might be caused by the air conditioning itself. However, if you are worry you can always ask the servicing center to look into this.

Cheers

LittleTiger SG

It has nothing to do with the service or 1k..

Its a normal case for Mit or Proton used Fuel Injection system.... u have gotta live with it. 2 to 4 cars out of 10 have this problem...
Sometimes after some km.... it will goes off and after some mileage of driving it will comes back again....

RooP SG

mine problem with mit (lancer sport MT) is when i clutch in the time..the rpm will go to 2k..which i had posted earlier before..

as for the wobbling its normal cos of aircon.

and yes..i too felt that the car is somehow lack of power even though its 1.6

is there any cheap way to adjust the car's fuel mixture to give better FC??..

AE86tofu SG

my 7-ton's idle is abt 600RPM also wad...and 2 me its okay Laughing ...just kidding...abt the low rpm thingy u'd better check it out with yr workshop man...2 low is nt good....IMHO 900Rpm is fine

ferrari7 SG

it is abnormal for idle speed to drop to 500 rpm. Possible reason is a dirty idle speed control valve. It is Dismantle throttle body and clean throughly, DE-carbon.