knocking or popping sound at start up

[jmabasa]

Originally Posted by jteixidor

Not really sure, Sounds more like a pop in the exhaust. If you mean lights on the dash by codes, I dont have any lights coming on. Any ideas?
Joshua

Did you ever find out what the problem was or is?

[myeboxsters]

I think I know what you mean and mine does this from time to time. (2001 S, 6 speed.)

I'd say it's more like an air "burping" or "gulping" sound, which could be described as a muted/muffled/soft popping or knocking.

I've always assumed it was just some normal intake noise -- never noticed any problem.