I have a 2007 1.9 and occasionally on start up, the engine will thud. This will happen on about 1 in 10 start ups. It is only a brief thud as the engine starts and it doesn't affect the way the car drives.
I have also noticed that occasionally the engine makes a tapping noise, Like noisy lifters.
My friend said he thinks it's the flywheel banging and putting out the timing.
Wondering if anyone else has experienced this or can help shed some light on it.
Thanks