Hi ya i have a 1997 proton coupe 1.8 16v evolution and when i start the car it starts to knock when cold, then after its been run it goes quite again, iv not that long ago change oil and had new radiator placed in could it be the oil presher switch being falty .
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Hi there? check the oil level. if there is no oil in the engine, it will make it nock especially at the top end.
If the oil level is ok then start the car and remove the oil top up lead and check if there's any oil coming up to the top of the engine. it should pray oil out of the hole. good luck..
The cylinders are worn out and the gap between them and the pistons is great enough when the pistons are cold to allow them to move around enough to knock the cylinder walls. The engine must be remanufactured - a very expensive job.
Alternator knocking ????is the alternator light on is it charging as is almost impossible to get a knocking out of a alternator and it still charge at the same time.
Start engine ind get a small plastic tube and put it on the alternator and put your ear to it and you should hear the noise real bad.
And you should feel it getting real hot after run for 3 minutes if not its not ALTERNATOR
It sounds like you may have some sludge in your oil. When the engine is cold the oil is thicker and takes a while for the oil pump to pump it through the engine. The next time you change the oil. Do an engine oil flush first to clean the inside of the engine and ports. If this does not work you might have to have the oil pump checked. There is no need to worry as long as you have oil pressure and the knocking stops. I hope this helps. Don't forget to rate this answer.