may be it ref no of engine in short it use for ref on production of engine
No compression could mean a blown head gasket, cracked head or cylinder.
Your head gasket or cylinder head is cracked.
P0302 is Misfire Detected in Cylinder 2. If it is the 4.0 inline 6, this will be the second cylinder from the front. I do not know off the top of my head which is cylinder number 2 for the 4.7 V8.
Assuming you mean coolant (not water), you probably have a bad head gasket or a cracked head.
Cylinder number three misfire.Cylinder number three misfire.
I have never noticed any numbers stamped on those heads other than part numbers but it makes no difference because the heads are interchangable anyway. Keep in mind that when your book says "forward and right," it doesn't mean YOUR right, but the car's right side, in other words, passenger's side(your left as you are facing the car from the front). The number 4 cylinder is on the forward head, but toward the passenger's front corner. The cylinder's from YOUR left to right, while facing the car, on the rear head would be 1-3, and the front head are 4-6. If you are looking at a number that is in reality in the number 6 cylinder position, since the heads are interchangable, that would also be the number one, if the head were turned around and mounted on the rear bank.
I assume you mean number 1 cylinder, which would be the front driver's side cylinder.
If you are getting white or grey smoke out of the tailpipe , especially when the engine is warmed up , you have coolant getting into an engine cylinder from a bad head gasket or warped or cracked cylinder head
This is most likely a sign of a Leaking cylinder head gasket, Have you checked your engine oil ? is it like a milkshake in color ? if so you may have a cracked cylinder head as well, Hope this helps
If by "internal" you mean inside the cab, the heater core would most likely be the culprit and needs to be replaced. If you mean within the engine, then you have a bigger problem as it could be a blown head gasket, or a cracked cylinder head in which case the cylinder head will have to be removed for repairs.
On an engine with two inlet valves per cylinder it means that there are two ports in the cylinder head and inlet manifold for each cylinder. (IE one for each valve.) Port refers to the passage that air/fuel enters the cylinder through. Older designs had one port in the manifold & head leading to the two valves.
Dohc means that the engine has 4 valves per cylinder or 2 camshafts per head :)