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Renewing COE for latio

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gnissan:
Hi All,

After driving my latio for 6 years, I have decided to renew COE. The car is 10 years old this year, another few more months
Upon preparing to renew, I have some considerations below.

The car condition now is not bad. Common issue would be air-cond. Compressor changed once, coil changed 2 times. Drivability is feeling quite sluggish like underpowered. This sluggishness is my main deciding point whether to renew or not. I still believe that something could be done to return the condition back to the responsive car it is 6 years ago.

Could you guys probably share with me on some points what to do next to get back this responsiveness ?
Below are the items that I have done and the effects of it :
1. Cleaned Mass Air Flow sensor - Very big improvement on the sluggishness compared to before
2. Cleaned throttle body - it's visually very dirty initially.
3. Replaced battery - noticeably more powerful right after replacing 1 year ago.
4. Replaced spark plugs
5. Replaced Ignition Coil

Generally I have been to a few workshops and common answer from them thinks that my car is fine.
Apart from Air cond, I don't have major issues with it now, but I do think somehow it's possible to regain back the old responsive car that I had before.
Yes, the feeling is different I know. But this is probably a long journey to understand what replacements could help.

Care to share some idea of what you guys have done and what made the biggest improvements to the engine performance ?

Thanks.

skullcap:
Bro, have u tried replacing engine mounting?

gnissan:
Hi skullcap,

I haven't replace the engine mounting yet. But I think I have the symptoms already.
When waiting at traffic light, engaged in Drive, D with leg on the brake, I can feel that vibrations are getting more and more.
in Neutral gear, can't feel this type of vibrations.
I noticed that vibration gets more when the rpm nears 600 and below.
Typically in D gear, it will hover between 600 - 900 rpm.
in N gear, it will be around 900 kinda stable.

Is this symptom directly pointing to the problems of engine mounting or my idling rpm problem ?
Is idling at 900 rpm ok ?

Probably the vibrations and the sluggishness has no direct relation, but it does impact driving experience..
Feel very uneasy driving in this kind of situation.

skullcap:
Looks like ur car is showing e same symptoms that I hd. It affects e idling n I feel, e responsiveness as well. I dun floor e pedal every time I accelerate n I cud feel e difference. After I changed my mounting, it feels like a different car altogether; almost like driving a new car ha ha...It's very quiet n virtually no vibrations. But all this is my opinion only. Hope it helps.

rongshu:
I changed engine mounting and felt the car is more responsive. You can try that. Not expensive.

Gearbox overhaul also make the car more smooth to accelerate but cost over 1k so unless yours is failing just leave it alone.

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