ASE A1 Engine RepairLubrication and Cooling SystemsEasy
A technician is performing an oil pressure test. The engine is at operating temperature, and the specified idle oil pressure is 15-20 psi. The technician measures 8 psi at idle. What is the immediate next step the technician should take?
- APerform a road test to check pressure under load
- BCheck the oil level and condition, and verify the correct oil filter is installed
- CReplace the oil pump
- DAdvise the customer that a complete engine overhaul is required
Show answer & explanationAnswer & explanation
Correct answer: B. Check the oil level and condition, and verify the correct oil filter is installed
Before condemning major components like the oil pump or engine, fundamental and easily rectifiable issues must be ruled out. An incorrect oil level, degraded oil, or an improper oil filter can significantly affect oil pressure readings. These are quick checks that should always precede more invasive diagnostics or repairs.
Why the other options are wrong
- A. A road test could potentially further damage the engine if the low oil pressure is critical; it's not a safe or logical next step.
- C. Replacing the oil pump without further diagnosis is premature and could be costly if the actual cause is simpler.
- D. Advising an engine overhaul based solely on a low idle oil pressure reading without further diagnosis is irresponsible and premature.
Low Oil Pressure Diagnostics
When diagnosing low engine oil pressure, always begin with the simplest and most common causes before proceeding to more complex and invasive troubleshooting steps.
- Start with oil level, type, and filter
- Verify gauge/sensor accuracy if possible
- Progress to oil pump, bearing clearances if initial checks fail
Memory trick: Low pressure? Start with the easy measure!