When I first start my 2006 CDI Smart I hear a clicking sound,IIf I give it a little RPM it goes away.Any idea where to start looking?

Lifters or valve. About $150 retail including labor.

this could be a bad wheel bearing.

bad belt, or belt tensioner going bad.

We need computer codes

Sounds like you have a sticking valve. Drain about 1 quart from your oil. Pour a bottle of engine cleaner into the oil. Let the engine run for about 5 minutes, turn engine off and let the oil drain back down, give the oil time to cool. Drain your engine oil and replace the oil filter and new oil. Sometimes this will have to be done 2 times. But I would do this once and then do this again in 500-1000 miles. the reason you hear the noise go away is, the engine reaches a higher rpm the vales are working faster and harder preventing it from sticking.

This is the trouble code definition....gives you a starting point!

P0011....'A' Camshaft Position - Timing Over-Advanced or System Performance (Bank 1)

I would bet money on sticky lifters .,why not put an oil flush through the motor ad with new oil and filter see if it goes away that is what i would do -----"yuodoit"

If u have hub caps remove them and see if the noise goes away.. Sometimes the hub caps aren't tight enough to the rim and move a little causing the clicking.

GET. THE CDI CHECKED OR REPLACED.....IT WILL HELP..

Sounds like the timing belt tensioner. I have that problem. Rattles at low rpm, goes away as you acceralerate. Looking to have timing belts changed and tensioners replaced.