* Oil Pump Installation: While you changed the pump, it's crucial to ensure it was installed correctly. A misaligned pump, a faulty gasket, or incorrect priming could lead to insufficient oil pressure. Double-check all connections and the pump's operation. Did you replace the oil pick-up tube as well? A clogged or damaged pick-up tube can starve the pump.
* Low Oil Level: Even with a new pump, low oil levels will trigger the light. Check your oil level using the dipstick. Make sure the oil is at the correct level on the dipstick.
* Clogged Oil Filter: A severely clogged oil filter restricts oil flow, reducing pressure. Replace the oil filter – it's cheap and easy, and should always be done with an oil change.
* Worn Engine Bearings: Worn crankshaft or connecting rod bearings allow oil to leak past them, reducing oil pressure, particularly under acceleration or when the engine is under load. This is a significant issue requiring engine repair. The oil light would likely remain on, or at least flicker, more constantly if this is the problem, not just intermittently.
* Oil Pressure Sensor: The oil pressure sensor itself could be faulty, giving a false low-pressure reading even if the pressure is adequate. A relatively inexpensive part, this is an easy component to replace and test.
* Worn Oil Pump Gears: While you replaced the pump, the internal gears within the pump itself could be worn, especially if the original pump failure was caused by prolonged low oil levels.
* Clogged Oil Passages: Sludge buildup within the engine's oil passages can restrict oil flow. This is a serious issue often stemming from infrequent oil changes or the use of improper oil.
Troubleshooting Steps:
1. Check the Oil Level: This is the absolute first thing to do. Low oil is the most common cause.
2. Check the Oil Filter: Replace it even if it's new if you've done a recent oil change.
3. Re-check Pump Installation: Carefully review the installation process to rule out any errors.
4. Have the Oil Pressure Checked: A mechanic can use a pressure gauge to directly measure the oil pressure. This is the most definitive way to determine if you have an actual oil pressure problem.
5. Inspect the Oil: Look at the color and consistency of your oil. Dark, gritty oil suggests sludge and a possible need for an engine flush (consult a mechanic on this).
Warning: Continuing to drive with an illuminated oil light can cause catastrophic engine damage. Do not continue driving until the problem is identified and fixed. It's best to have a mechanic diagnose the issue if you're not comfortable doing so yourself.
