its coming fron the engine Had the same issue and while yes it is from the engine not sure if there is anitifreeze anywhere else :) The source was the lower intake manifold gasket was leaking, common on this engine... I was lucky and it did not leak into the oil. The gasket does not cover the front and rear of the block, that is where the bead of gasket sealer runs up the angle to the gasket. Where the manifold meets the block at the angle is prone to leak. Took me a day to do but I was in no hurry. Hope that helps
there is no water mixed with the oil but have antifreeze coming out of the exhaust
Is it water ( condensation ) or is it antifreeze. If it is antifreeze it should be smoking WHITE out of the exhaust pipe and if it is then you have either a blown head gasket or a leaking Intake manifold gasket.
Where is the leak coming from. Most likely you will need to replace the exhaust manifold gasket which will require removing the exhaust manifold.
If you aren't hearing a lot of exhaust noise and you're just getting smoke, you have either an oil leak or antifreeze leak that is getting on the exhaust manifold. If you're getting oil on the manifold you have a fire hazard and should take care of the problem immediately. If you hear exhaust gas leaking around the manifold you need to replace the gasket or possibly the manifold is cracked and you need to replace the manifold.
it's in the down pipe coming from your exhaust manifold. you will have to remove the heat shield from the exhaust manifold to access it
The oxygen sensor is located in the exhaust manifold before the catalytic convertor. If you look down between the radiator and the exhaust manifold a few inches before the exhaust pipe connects to the exhaust manifold you will see the Oxygen sensor. The sensor will have 2 wires coming from it and it kinda looks like a sparkplug stuck into the exhaust manifold. There is 2 nuts that hold the oxygen sensor into the exhaust manifold.
it could be a leak coming from the chamber behind the water pump just beneath the exhaust manifold. too much labor
i have had an antifreze leak also but at the front it was the intake gaskets and have two frends with tahoes that needed intake gaskets also
By "exhaust manifold sensor" do you mean the O2 or oxygen sensor? The only sensor I know of on a exaust manifold is the O2 sensor and if you follow the manifold you will see 2 sensors sticking out they will have (usually) green wires coming from them
Internal engine antifreeze leak what else could cause besides headgasket? there is no antifreeze in the oil it is clean
If there is oil coming from the exhaust manifold it generally indicates a bad valve stem seal or a worn out engine. (too much crankcase pressure)
The egr valve should be coming off of the exhaust manifold.