Well, I faced some idling issues too, 1 year ago, when I had my Vios G for 4 years at 126k. My car could not idle for long, anything more than 1 minute, the engine will stutter than die. This is especially so at traffic lights and traffic jams. Went to my usual mechanic, he thought it was the MAF. I changed the sensor for RM280. Problem resolved for 3 days. Then the same problem came back. He later serviced the throttle body. The car was all right was 2 days, and not surprisingly, the problem came back. My mechanic went to his friend who had a better diagnostic tool, and it was reported throttle body failure. Changed the throttle body. Luckily he is my usual mechanic, did not have to pay for it, just use it first and see. And 2 days later, back to the same issue. <<i'm a naughty boy who just used a naughty word>>! Very fed up and very stressful driving the car in KL. Anytime can kong!
Went to another place recommended by a KIA sales agent. This mechanic is a sifu with Vios in Sunway industrial park. Seems even the Subang Jaya Toyota service centre will refer chronic cases to him. He checked my coils, 2 bad coils. Ok, changed them. Better now. But… you guessed it, the problem came back. Now I am really pissed. I then remembered from my days of driving a Conti, the issue could have been related to the O2 sensors. So I got the mech to change the sensors. He did not have new stock but he got some old ones with the same specs (but different sockets). Anyway, he modified the sockets to fit my car. Lo and behold, the problem disappeared. Drove like that for a week until I had the time to install the new O2 sensors.
Idling back to normal, very smooth, even at 600 rpm. Even when the aircon cuts in and out. With aircon on, it idles at 750 rpm.
Total damage, for the MAF – RM280, coils – RM1,320 (ori from Japan), O2 – RM900 (ori from Japan). Throttle body return to my mech.
Fast forward 1 year to last 2 months… idling went flaky a bit, can feel the car vibrating a lot but idling speed still at around 600 rpm. Feels like dying but never died.
Checked with the 2nd mech, tested, everything ok except that when I am in D, my idling will drop further to 500 rpm. Seems my gearbox is putting a lot of drag on the engine (well, I had gearbox issues when the car was 6 months old), kept sending to SC Toyota and they always claimed nothing wrong. But if nothing is wrong, why the h#ll does it “bang” into gears when I am on full throttle? Ok, I drive my cars hard.
Anyway, the mech also found 1 engine mount about to koyak, hence the vibration. For prudent measure, he also adjusted my idling a bit higher, so now it idles at 750, with aircon on about 800 and when I am in gear, D, it drops to 600 rpm (the drop is a bit too high per the mech and he says it could be my gearbox issue now about to manifest into something bigger). And it has been like this for the past 2 months with no further issues. Still driving it hard (I usually “explore” the upper reaches of the RPM).
And since my car is about to be 5 years old and I am getting fed up with the issues, I have already sold it but still using it until my new car arrives (which I have booked 2 months back and SA not sure when the car is coming). Going to other brands… also from the EAST.
Ok, that is my rant for the day. I know it is a bit long but….
this is a good sharing bro.
i had the NCP42 same 5 yrs old currently with me. I bet yours is the newer version NCP93?
apart from regular servicing and a major one after 5yrs & 100km mileage, i don't have any problems with my car at all. In fact, it still feels very much alike the first day i had it.
The insides of NCP42 vs NCP93 should not differ that much, which is why it is still very hard for me to believe your past experience.
Aug 16 2012, 01:56 PM
Selamat Hari Raya 
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