bad rings most likely burnt valves i would also suspect a blown head gasket between those 2 cylinders
It may need spark plugs/wires. And while you're at it, run a compression test. If the compression is low in one or more cylinders it will make those cylinders less likely to operate properly.
You may have a blown head gasket. If you have a compression tester available, check compression on all four cylinders andcompare the readings. If adjacent cylinders read lower compression than the other two, it is likely the head gasket is blown.
You may have compression on any cylinder where the valves happen to be closed, but you will not have compression on all cylinders. 1991 Sable does not have a 305 engine.
It may not have enough compression on adjacent cylinders because of a blown head gasket or there may be 2 restricted fuel injectors or their may be a major vacuum leak.
A miss on one or more cylinders and lack of power. Remove all spark plugs, remove the coil wire and run a compression check on all cylinders. The ones with low compression may have a burnt valve.
You also need compression for the fuel/air mixture to ignite. Check all cylinders for compression. The compression should be higher than125 psi. You may have a bad headgasket.
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.
not long If you are saying that you only have 50 psi compression on two of the cylinders, then you need to find out why those two cylinders are that low on compression. You may have burnt valves, broken rings, or a blown head gasket. A blown head gasket is very serious and should be repaired ASAP. Stop driving the car until you find out why the compression is low.
not if all the cylinders are even, you may have some leak down past the rings but unless your having differences greater than 20psi I would not worry
Yes, a blown head gasket can lead to carbon buildup in the cylinders, particularly if coolant or oil leaks into the combustion chamber. This contamination can cause incomplete combustion, resulting in carbon deposits. Over time, these deposits can increase the compression in the cylinders, potentially yielding higher than normal compression test pressures. However, it's important to diagnose the underlying issue, as other factors may also contribute to elevated compression readings.
Laminectomy may be performed when an abnormality causes spinal nerve root compression that causes leg or arm pain that limits activity.
To check if cylinders are firing, you can use an ignition timing light or a cylinder compression tester. With an ignition timing light, you can observe the flash of the light at the spark plug wire to see if it is firing. A compression tester will measure the pressure in each cylinder; if a cylinder has low or no compression, it may not be firing properly. Additionally, you can visually inspect spark plugs for wear or fouling and listen for engine vibrations or misfires while running.