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Remove the oil sender unit, fit a oil pressure gauge , start the engine and read the oil pressure at idle engine hot, must read above 10 psi and needle not flicking, must increase with engine speed , if pressure is ok replace censer, if not check oil pump screen and relief vale spring, can also be caused by crankshaft bearings clearance .
If it is a diesel vehicle check the pressure of the diesel pump. It would appear that the diesel pump on this model wears out and it loses pressure. If the pressure is ok there is switch/filter on the common rail that might be blocked. Unfortunately it appears that this switch can not be cleaned but must be replaced. hope this helps.
i would check all the basics like spark plugs and check for vacuum leaks around the intake manifold.With a can of 2+2 carb cleaner while engine is running --if idle goes up or down that is were your leak is-- check egr too, Lee
could be you have a few bad glow plugs or a relay for them or a bad glow plug controler. the glow plugs are basicly a direct short that creates heat that warms the air in the cylinder to aid initial start.they can be checked wiyh an ohm meter. remove the wire and place one lead on the wire connecter of the plug the other to a good ground.you should have good connectivity. if not replace the plug
U may find that the negative battery cable has worn and it needs replacing. Check from battery down to the car cassie. That happened to me on my Nissan.
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