I have an 02 chevy suburban it dropped oil pressure I replaced the oil pump but am still not holding oil pressure after it warms up good the pressure drops to zero. What else could it be causing lose?
What tests have you run? How did you run them ? what engine are you working on ? If you are following a diagnostic, does it tell you where to sample the pressure? where ? and then what was your reading ? What is your specification ? at what condition ?
If your readings are below spec, the next test, having tried a new pump already, is to put induced oil pressure in the engine, provided you are using the A/C delco parts and you have a good filter and your pump has a good relief valve. Now I must ask... while the pan was off, did you pull some mains ?
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