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If a 1990 C1500 350 oil pressure is ok when the engine is cold but when it reaches operating temp the oil pressure drops to 0 at idle is this caused by a weak oil pump or a bad oil sending unit?
Wiki User
∙ 8y ago
This is likely a combination of many minor problems. the bearings may be worn a bit, the oil pump worn, a look at a different oil and filter may be worth looking at and a bit of a funky oil pressure sending unit. the question did not say how many miles/kilometers is on the engine and if it is light or heavy work load on a regular basis. hope this is helpfull. Personaly on my own vehicle the oil pump is where I would start.
I had first hand experience with this issue. All I had to do is switch oil weight (I switched to 20w50 in summer and 15w40 in the winter).
Wiki User
∙ 8y ago
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