QUOTE(waiwai_wai @ Aug 2 2020, 01:11 PM)
Tried fuel injector treatments, i feel like it just a gimmick.
Btw, I 'm maintaining full synthetic + ron97 all the time.
Can do partial overhaul but not full overhaul. But need to find some expert to do it, if go normal workshop, he sure tell you to change all wear n tear

My Avanza is 307K km now .
Engine no makan engine oil with 5W40 (I dont use xW30) , yours consume engine oil or not ?
At 40 psi tyre pressure, with BHP RON 95 (not 97 ) my fuel consumption is 13km plus /L traveling outstation to and fro KL/Malacca by PLUS .
Travel to office at KL Sentral by Federal Highway before 6.45 and not much jam and returns by Bangsar NPE to home and internal Subang Jaya trips to local shops/supermarkets/visits friends overall can get 11 -12 or 12.5 km/L .
When I got 10 km/L 12 months ago , the car was starting and driving in normal form ,no signs of problem with pick up etc . Only consumption drops to 10 km/L . then,
Replace cheapo normal sparks (after 3 to 4 years usage of some 65K km plus) and found spark plugs gap was as big as 3 mm (pening kepala ) .
Still no improvement .
Send back workshop for check by computer found O2 voltage out of spec. Replace Denso O2 sensor then can get back above fuel consumption figures which I'm very happy till todate .
Pick up , power etc has always been no problem and good IMO .
I have 15k to 17k km oil change intervals .
Can your car behave like mine above ? If no , what are the difference in xxx km/L or no power or makan minyak engine ??
I ask so many questions is because I don't believe your car requires top/major overhaul if no kuat makan minyak engine (indicating your valve seals and piston ring sets are good and ok) .
Bad fuel consumption (caused by not using BHP or spark plugs , OS sensor, distributor system, injector a bit dirty etc ) or drop in pick up performance (loose makan minyak engine and low tyre pressure at 31/35 psi etc ). All these likely doesn't require overhauls IMO .
This post has been edited by zeng: Aug 2 2020, 09:48 PM