i would try changing the spark plug first
No, the chain should last the life of the engine.
The 2009 Honda Accord 4 cylinder does not have a belt. It has a chain that should last the life of the engine.
The heater core will not have an effect on the check engine light. See related question below for more info on misfires and engine light.
cylinder heads contain the intake and exhaust valve systems and sometimes the cam shaft(s). the valve system parts are normally the parts that wear out first on a high milage engine. these are all vital moving parts that need to be cleaned,reconditioned or replaced, have their respective bearings replaced, and/or be re-machined.
No, normally they will last the life of the engine and are replaced when they engine is overhauled.
Not Applicable The Saturn 4 cylinder, both the SOHC and DOHC used a chain, and it doesn't need to be replaced unless the engine has OTHER problems.
Between the engine block and the cylinder head. Saturns are all overhead cam engines. If you haven't worked on one before, don't. You'll need to take it to the dealer or a reputable shop to have the head gasket replaced and the cylinder head resurfaced. Generally, head gaskets only fail if the engine has overheated. Engine fluids are important and need to be maintained properly.
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.
A few things can effect gas mileage over sized tires, tire pressure, spark plugs taht need to be replaced, over due engine oil change. Then again it may be the size of engine in it, typically 4 cylinder get better mileage than 6 cylinder motor.It coold also have to with the speed you are driving. A few things can effect gas mileage over sized tires, tire pressure, spark plugs that need to be replaced, over due engine oil change. Then again it may be the size of engine in it, typically 4 cylinder get better mileage than 6 cylinder motor.It could also have to do with the speed you are driving.
which is cylinder number two on gmc envoy 5.3 litre
This is not a regular scheduled maintenance item. Normally it will last the life of the engine. It is replaced when the engine is overhauled.
you will need V8 motor mounts and a bigger radiator.