petrol consumption is very high

2006 DAIHATSU HYJET
96,000 MILES • 0.6L • 3 CYL • 2WD • AUTOMATIC
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SURANGA WWF
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my mini van has a s320v engine. can you teach me how to fix engine timing? i have big problem petrol consumption is very high, like a one litter it can run 8.5 km only without air conditioning. when highway if i drive it can 11 km.
I did engine half overall but i could not get any trouble in engine. all things i clean and repaired. also, spark plug and o2 sensor i changed. also, i did clean throttle body petrol pump. i have suspected for engine timing. do you have any idea about this issue?

I am sorry .
I do not have more English knowledge. Please try to understand.
Oct 19, 2016 at 6:40 PM
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STRAILER
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Yes if you have the timing belt off it will cause this problem, here is a diagram for you.

Please let us know what you find so it will help others.

Best, Ken
Oct 24, 2016 at 7:00 PM