my 07 impreza started ticking a while ago. but only seems to get worse as time goes by, and only when the engine starts to warm up. my first Subi and I love it!!! hoping someone can help easy my worries please. any info is welcome thanx

Probably the cam belt tensioner needs replacing.

 

I had a new aftermarket one die within 20k km.  Replace with a genuine unit if possible!

 

Cheers

Bennie

1. Piston slap. If it goes away or lessens as it warms up, that’s classic slap

 

2. Replace the Timing belt tensioner. If a complete timing kit hasn’t been installed then install an Aisin timing kit. Replacing the belt only is such a poor decision I don’t understand why mechanics do it as a rule, it makes no sense at all mechanically or financially.

A mechanics stethoscope and isolating where the noise is coming from may help - left, right, center, front, back...may be helpful.