Car is Myvi 2005. Had about 300,000KM on this old thing.
Now having problem - engine died at random during stop at traffic light. Usually when A/C is on and radio is turned on.
All radio settings got reset once the engine died.

No check engine light.
Repairs done: changed fuel pump, cleaned throttle body, new spark plugs.

My usual mechanic under the tree stumped on this curious problem. Bit of googling says that it might have something to do with radio but it was a really old thread, so I thought that this might be a common problem that I didn't know before.

Many thanks.

EDIT: checked alternator and battery. Normal.

Now sometimes the engine died when turning on the headlights lol. Happens when stuck in jam.

This post has been edited by Steponlego: Jul 7 2022, 09:59 PM

How old is the current battery? Alternator?

Battery & Systems Test done ? Got the printed test result ?

This post has been edited by Roman Catholic: Jun 29 2022, 10:22 PM

Not done yet. How does a bad battery can cause this problem?

I think last time I replace the battery was back in 2020. Amaron brand.

Correct an old weak battery can cause the engine to stall. Systems Test are meant to check if the electrical charging systems are ok. If there are not ok, that will create problems for the battery too.

Example B&ST would be like this ...

Makes sense.

Come to think of it, electrical stuff isn't exactly the mechanic strong suit. Never saw him hold an OBD tool. I think I have reason to doubt his word saying that the battery and alternator is good.

Where to do this test? Battery shop?

Audio reset means power supply cut off. Check wiring/ battery connection.

Perodua Service Centers would have better diagnostic tool. Alternatively you can check with your local battery reseller if they can do B&ST for you.

RPM for idle mode is too low?

about 700RPM, normal for the engine as stated under the hood.

Yep recently they do battery test and tayar check also as part of std service package, they kasi slip lepas habis service. Really helps to better predict the time to replace batts.

with your case, do you feel Jerking/engine start to die off when in Standstill mode? And RPM drop?
If yes, then only set higher...

The more electronic plugin/devices in the car will caused power drainage(Handphone Charger/GPS/New Player/speaker./Camera). Hence higher RPM is needed to keep the Power supply steady.
Sometimes

Most probably electrical. Alternator might be the problem. Not enough to charge the battery and maintain normal electrical functional. That's why radio reset. Radio lost all power to maintain it setting. Means battery not properly charge. Next might be wiring problem. Check at batt supplier.

Change throttle body switch/ sensor and service your throttle body as well

Other normal wear and tear like spark plug , air filter and oil filter if change follow schedule should not be the problem

jika alternator rosak. batt power zero terus. he wont able to restart immediately

simple diy without getting deep i would be remove non essential fuse

standby cheap obd below rm50 to reset fault code

i will suspect alternator first, then fuel pump, but fuel pump you dah done.

in KL? there is a popular shop here in LYN. siap ada thread. search for kwong weng

check charging systems and car battery.

From the symptoms seems like electrical problem to me as well, likely alternator or battery.