Hi
Im considering buying a 2.0 gasoline automatic here but when the engine starts up there is this really odd noise coming from the engine. It's not an engine knock, its more of a thump. Anyone have any ideas what it could be or where is a good place to start looking?
thanks

MJ in Marrakech

 

If it is coming from the intake area, then check the air filter cartridge is seating properly and not able to bounce in the filter housing. Check the intake accordion pipe is properly secured with clamps and doesn't have an holes or tears in it.
The other intake issue that can occur (more when idling) is with the idle speed control valve that sits on top of the throttle body, it might be hunting if it is getting sticky and worn. Might need replacing.

Check belts for flat spots or damage and try to determine if the sound is synchronous with the accessory belt rotation.

But as always, try to isolate the area either with a mechanics stethoscope, a piece of tubing you can hold to your ear and then try to ascertain the direction of the sound, or a long shaft screwdriver that you can put the handle to your ear and touch the driver tip to various safely fixed locations to see if you can isolate an assembly source.

Good luck.