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If there is nothing wrong with your oil level however and it actually runs fine with no black smoke from the exhaust, make sure you didn't leave a tool or other metal object under the hood on the engine somewhere.
If there is nothing wrong with your oil level however and it actually runs fine with no black smoke from the exhaust, make sure you didn't leave a tool or other metal object under the hood on the engine somewhere.
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Have you checked your oil? Sounds like you may have run it way low, the loud metallic noise is probably metal on metal contact inside your engine, add oil and it that fixes it, count yourself lucky, if not need to take it to a shop.
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Brown Milky Oil sounds like your head gasket has gone and coolant water is mixing with engine oil. Unless you have an oil cooler, it may be from there.
You can locate the rattling if you get someone to start it with the hood up.
It can be a number of issues if the noise is engine related but have the oil pressure checked with an external oil pressure gauge. Most mechanics will have them. I would also change the oil and oil filter immediately and ensure you ONLY use the correct oil as specified by the manufacturer for that engine. (Using an incorrect formulation or the wrong grade will cause engine issues).
I suspect the engine is losing oil pressure and oil flow at low RPM and you are getting metal to metal contact on the top end of the engine when this happens as the low pressure is producing a lack lubrication to the upper end of the engine. At higher RPM the oil pressure increases as does the oil flow and the noisy internals are getting sufficient lubrication again or at least enough to eliminate metal to metal contact and stop the rattling.
To narrow it down, while the engine is running, don't get near moving parts, you can use a long piece of steel, metal, put 1 end on the valve cover, the other to your ear and listen for rattling. You can move it around to narrow down the source of the noise. It's like a stethoscope but works well. I use a 3' long screwdriver.
it is probly your valve train starving for oil.I would try using a thinner oil in the winter time or just switch over to a full synthetic oil this should help.Once you switch to full synthetic oil though it is recomended to stay with it it is not good to go back and forth from synthetic to regular oil.
If the rattling changes with the revs of the engine, it might be that the valve compensators are either worn or not getting enough lubrication. 20V engines have quite small oil passages travelling to the head. They tend to clog up with gunk if the oil change is not frequent enough.
4.0l's are notorious for valve rattle on cold start-up. There is really nothing you can do to make it go away short of completely replacing the valve train in the top end, and that isn't a permanent fix. It's is an top end oiling issue from the factory. Just don't race your engine on cold start-up until the rattle stops.
The rattle in the transmission sounds to me to be more of a loose dust shield/heat shield around the transmission or exhaust than a mechanical issue.
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