Why does my Hyundai i20's engine knock when driving uphill?

Just noticed when pulling away and changing up the gears in my 2009 Hyundai i20 that, as I try to accelerate in second gear, there is a knock from the engine when driving up a gradient. Is this normal as the engine is under load, or should I be accelerating to a faster speed in first to try and stop the knock?

Asked on 15 July 2010 by MR R WATT

Answered by Honest John
You might be changing up to 2nd too early.
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