QUOTE(lihongmint @ Aug 9 2020, 06:01 PM)
My 1.3M iswara is equal to 70km/h at 2000 rpm. So I usually at 70 to 90 km/h for my drive from home to office. I don't drive over 100km/h consider it is a 20 yrs old car
The engine noise is trrr. It can happen in first gear
if I press petrol harder but noise gone when switch to 2nd gear as rpm will drop below 2000 rpm. It is
noticeable at fifth gear at 70km/h above.
I am not sure if my driving habit is bad but it considered I drive gently. Switch gear when engine noise is high or high rpm. But I could be wrong
My hunch is your 'slow and steady' but 'poor' driving habit is causing
engine pinging/or knock or engine detonation , which typically happens to long-used engine AND slow and steady fuel-economy conscious driving style among seniors or ladies .
The ringgit-free way to overcome this trrr... noise is ,among others :
a )always engage lower gear (or switch on the 'OFF OD overdrive' button for automatics) during pick up ;
b )avoid engaging top (5th) gear at slow engine rpm below say, 1800 - 2200 rpm ......
instead always drive a bit more aggresively at higher rpm of 3000 or more , if need be switching on the 'OFF OD' button to reduce road speed (if you feel is too fast for you) ;
c )At slow crusing speed in top gear below 2500 engine rpm , always 'tekan minyak' a bit before climbing a hill slope or downshift one gear speed , etc .
I can assure you replacing con-rod and/or main bearings (as recommended by workshops) by itself will not solve your engine pinging/knocking problem as encountered above .
Only after changing your 'slow and steady' , but IMO 'poor' driving habit by driving more 'aggressively' can you overcome the trr....rr... noise problem in typically long-used engine especially during pick up or entering into an uphill slope .
Without changing your 'smooth and baby'ish ' driving style , you will encounter the same problem with brand new engine or brand new car after say 10-15 years of usage .
I don't recommend you spending money now on decarbonising the engine/replacing new spark plugs/ignition system or retune the engine etc etc since you are not really a driving enthusiast (as I find them unnecessary for you , for now) .
https://www.google.com/search?client=firefo...etonation+noiseThis post has been edited by zeng: Aug 10 2020, 12:13 PM