Lately, 1 of my cars have been having low idle RPM, below 700

This tends to result in bad at traffic lights/jams.

Can this be fixed? I've sent it to SC many times, but they just said "reset liao, should fix it".

Could this be engine mounting problem too? Is there such a thing as better engine mountings that reduce engine vibrations?

Thanks!

EDIT: sorry, typo xD

This post has been edited by ViktorJ: Nov 18 2018, 08:33 PM

Idle RPM is considered normal if it hovers between 700 - 800 RPM.

Below that, then it is considered low.

You can try to clean the throttle body and MAF sensor. It should restore the idle to normal by doing that.

may i know more specific, what car, model and year of service?

wow so above 1.5k only consider normal?

that can't be done DIY right? will SC do that?

Hyundai i40 2015, GDI engine, 2.0, serviced with ultra helix every 6 months, 30k km

my bad, 500 RPM

haha, clean your air filter,

Ur TV is ok? not sure just talk only

air filter just got changed
what is TV?

SC will do it for you upon your request. I just don't know how much they charge.

Just saw your car is having GDI engine. The low RPM can also be due to carbon deposits located at the intake valve. A very common problem on GDI engine. It will take a lot more work to clean these area.

I always DIY on my Honda City 2010.

This post has been edited by Thrust: Nov 18 2018, 04:09 PM

ok thanks

I found some videos/guides online, later I go brothers and buy the spray/cleaner

sorry, not tv but tb, throttle body

uhoh, for this gotta go to workshop to sort out, right?

yes.

Do you have rough idling as well, not just low? It is something to do with fuel. Maybe fuel injector get clogged. Try fuel injector cleaner. Maybe bad spark plug.

Personally I think I'd just try another set of spark plug. Cheaper than send for inspection

Ahhh! This most likely the cause. I don't like the GDI engine for this but since you go to authorized shop under warranty, this should be under scheduled maintenance, right?

Leaking hose.... Need to check....

Too much carbon buildup. Same problem as EP6 engine for Peugeot 3008. Cost RM 200+ to decarbonise. According to mech, this is due to poor quality fuel used (aka RON95 from Petronas).

Yup, rough idling. Ok will check out fuel injector cleaner too.
Hmm spark plug huh. 30k only wor.

Not sure if its under scheduled maintenance, but will check it out thanks!


Nope, just checked all hoses, all good.

Yeah could be this too. I use 97 Shell. But I heard that there will be carbon buildup regardless of what fuel we use though

Mine jerk after spark plug not long after serviced. They tried every other thing including changing wire harness in engine compartment but then try th spark plug last though I've been suggesting this so long. Problem gone. Just bad new spark plug ... well not bad immediately though

service MAF sensor and throttle body. can spray seafoam intake spray also.

modern car recirculates exhaust back into engine for better complete burn and due to government regulations on exhaust.
it's by design to get dirty and get clogged, especially intake valves, egr and throttle body.

LOL, you're one of the few that answered this step correctly.
GG a lot of owners kena buta change spark plugs, change lots of unrelated things due to rough idling from dirty throttle body.

btw, MAF sensor very hard to get clogged. i opened mine before and it's like new !

low idling good for less vibration la..
its depend on your car status..

it new car and low rpm..
u can ask SC to increase it using Consult diagnosis tool..

if old car..
u need to some maintenance laa..
ur car under power probably...