In and of itself, no. That's usually a sign of a main bearing going out, though.
No but an engine running like that can damage the valves.
Yes.
On an interference engine the pistons can hit the valves. That will cause severe internal engine damage.
On an interference engine the pistons will hit the valves and cause severe internal engine damage.
If the valves are incorrectly adjusted it will hurt performance.
Referring to the Auto Education and Gates (commercial) websites (refer to the links, below), the 2003 Kia Rio is referred to as an "interference engine", which means that, as with many other motor vehicles, "(i)f your timing belt breaks, the engine will continue to turn, but the camshaft stops. If any of the valves are open, and your engine is an interference engine, the piston will slam into the open valve and cause some real expensive damage", including, potentially, needing to replace the entire engine. This does not cause the valves to "bend". the valves bend, I'll ship you the bad valves.
The engine is an interference engine, if the timing belt breaks or slips it will cause damage to the valves and possibly the pistons.
yes! new valves etc, will mmost likely need new engine
If it is an interference engine valves can bend when hit by the pistons.
Incomplete combustion in an engine indicates that all of the fuel has not been burnt. Incomplete combustion can cause clogging and damage to the valves in the engine of a car.
It does however have a box on the front of the engine below the intake that can clog and cause oil leaks. It is called a number of names, oil trap box, oil separator box, etc. The turbo 5 cylinders do not have pcv valves. Dan
There could be loose rings in the engine that would cause this. The valves on the engine may also be chattering.