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'Thud" sound on initial acceleration

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mlee01:
I bought my Latio in Nov 06 but it is a YOM 2005 model. Almost coming to 5 years now, just about to hit 60K

About a year ago, I start having this problem with my Latio. Everytime I start my engine and move off, there is a single "thud" sound when it hits approx 10km/h, then another "thud thud thud thud thud" (5 times) when it hits approx 30km/h. After that no more such sound whenever I stop and move off. Sound appears again after I switch off engine totally and move off again.

The sound is very feint and sounds like construction piling work far away yet you can hear it faintly, initially I thought it was due to some construction work near my house but it happened again and again.

During last servicing in Jul 11, TC mechanic said it is due to ABS when starting up (don't quite exactly understand what it means). Last week sent to another mechanic at TC at first he cannot figure out then afterwards called me (after checking with other mechanics) that it might be due to petrol type used, he suggested I use 98 octane. I intend to try this at my next refuel, try for a few months see if it helps.

Anyone experienced this before?

Lby:
does the 98 fuel helps? are you using CVT gear box? some article claim that the gear box fully lock at 18kmh, maybe is some clutch issues?

mlee01:
Have not had the chance to top up fuel tank yet, slightly over 1/4 tank to go. I top up tank once every 2 weeks hence I think i can see the effect only in Dec if i were to try 4 tanks.

Yes I drive a CVT gear box

hok:
Do you hear the sound if you turn off the air-con ?
do not turn on the air-con b4 u start the car and drive without it for a while to see if sound still comes on.

Lby:
the sound is still there no matter the air con is on or off.

i think the sound is coming from the gear box. lately only notice this sound.

other than changing the CVT oil, is there anything that can be done on the gear box?

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