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When a Hyundai is losing compression in its engine the car will not run properly. Symptoms of low compression are misfires, stalls, and overheating.
worn or broken compression rings engine needs a rebuild
Low compression in one cylinder can mean several things. The valves or piston rings may need to be replaced. There may be a crack on the engine, or the head gasket may have blown. The engine should be diagnosed properly to see what exactly is the cause of the low compression.
The repair depends on what is causing the low compression. Low compression can be caused by a blown head gasket, cracked cylinder head, burnt or damaged valves, worn or cracked piston rings, scored block cylinders. It's kind of hard to imagine that an engine would have low compression on all 6 cylinders unless something major is wrong, or the compression gauge is not measuring properly.
Low compression indicates that engine damage already exists. An engine's compression will be lost if: there is damage or wear to the pistons or rings there is damage or wear to the valve train there is damage or loss of seal on the cylinder head There are some other factors as well, but these three cover most. To get help in figuring out which is which, visit me at http://www.autoservicetech.com
AGE ! if it is low compression and not no compression then your piston rings and valves are worn too much and the engine probably needs to be rebuilt.
Low compression will not cause an engine to not run. It may not run efficiently but it will run. Low compression on all cylinders is caused by wear, and can only be fixed by overhauling the engine. Low compression on just one cylinder can be a blown head gasket, burnt valve, or a broken ring on that cylinder. I also depends on what you mean by "below average". An engine with lots of miles may very well have a compression reading that is below the factory specifications and not be cause for alarm. It depends on how much below specs that compression is. In any case, the only fix is to open the engine up.
The short answer is "yes". How low is low? And is compression low, and equal between adjacent cylinders? If you squeeze the radiator hose while trying to start the engine, can you feel pulsations? If the answer is yes to either question, you may have a bad head gasket.
The piston rings may be worn out .
If it is causing the cylinder to misfire, yes.
No. It won't have enough compression to fire the cylinder to burn the fuel and air mixture thus creating a "miss".
The more boost you use the lower compression you want. Higher compression with boost leads to detonation which leads to excess engine wear and damage.