Car has approx 190k on it for a start, I've had it since 170k and my mum and dad had it since about 120k. When I got it, I asked if timing belt had ever been done, to which they answered no. Pushing it I thought, so far on the same belt, so I went to remove the top belt cover to see what condition it was in. The cover had been snapped clean in half and rebolted on, but the belt looked fine, no cracks or anything. This makes me think one of dad's mates, who 'knows what he's doing' has had a stab at changing it.
As the thread title, if in heavy traffic and crawling along at the bottom of 1st or 2nd gear and then the gas pedal goes down hard, the engine gives a loud thud which I think may be the engine knocking. Could this be a result of an incorrectly fitted timing belt? If so, what are the implications? The engine also idles slightly erratically, but doesn't seem to want to stall at all.
I wouldn't put it past one of his mates, as one of them did front brakes for him. Not only were they wrong parts, the fitting of them was a mile out!