1. Engine Noise. With a bad oil pump sufficient engine oil will not get to all parts of the engine, especially the top end, and you will get engine noise with metal parts that would normally be lubricated and quiet knocking due to metal to metal contact. Engines with hydraulic lifters that become noisy can be a sign that they have insufficient oil supply. In addition to the hydraulic lifters, your valve train may begin to make noise if your oil pump begins to fail. Valve train components need to be properly lubricated as well. A bad oil pump can result in a lot of additional noise from your valve train system.
2. Higher engine temperature. Poor lubrication because of poor oil flow generated from the pump will cause friction in the engine and the engine temperature will rise. Good oil flow is essential for lubrication and reducing friction to a minimum.
3. Low oil pressure. The oil pump generates oil flow through the engine but tolerances between metal parts produce the oil pressure. Very worn engine bearings will result in low oil pressure. Thus a worn engine will have low oil pressure even though the oil pump may be fine and there is no issue with the oil pressure relief valve either. However you will also experience low oil pressure due to a failing oil pump because poor oil flow will also result in lower oil pressure.
If your oil pressure warning light has been triggered in your engine, the causes of the low pressure need to be properly investigated because the problem may not be with the oil pump. People replace oil pumps assuming that is always the problem and then still have low oil pressure because the pump was not the problem to begin with.
My car sometimes stalls when I come to a stop. We have replaced fuel pump, fuel filter, mass air flow sensor, altenator, and I believe the crank sensor. I've noticed when I come to a stop light I loose oil pressure before car stalls. Check engine light is on. We took car to shop and they told us it was giving the altenator code. Changed altenator and light is still on.
Low oil pressure at low idle speed will not be an oil pump issue if the oil pressure is otherwise fine. Any competent mechanic with a external oil pressure gauge can hook it up to your car and check the pressures at various RPMs. If you oil is old and has not been changed for 8-10000 miles then change it. It needs to be done every 4000 miles for the type of driving most owners perform. If you have a high mileage engine with just average maintenance and lots of wear on the components, especially the worn bearings which will now have excessive clearances , the engine will most likely suffer from low oil pressure most obviously when the oil is hot and the engine is idling.
If the check engine light is still on then you need to find a competent mechanic that can diagnose the problem for you because the from what you have said others have failed to do this. Typically a lot of these people are OK at wrenching but hopeless at diagnostics. They will just pull up a fault code, guess what the problem is and change a part. If the CE light is still on then the computer will be generating fault codes and a scan with an adequate scan tool for your particular model, should be throw up more fault codes. That aids the diagnosis but does not end it. Just beware of the shops that tell you that your car has ABC code and that automatically means YYY part has to be replaced. It might be but it may also be something else. The new part is fitted and the fault code remains because the diagnosis was wrong.
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Oil pumps don't go out unless there is a lot of metal in the pan. What's your problem?
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