There is oil in the air inlet under the throttle.

1, the engine oil storage capacity is too small, resulting in no or little oil in the lubrication system, resulting in low oil pressure. Solution: replenish oil.

2. Dirty or sticky oil will cause the oil pump to fail to effectively suck and pump oil, resulting in low or no oil pressure. Solution: Change the oil.

3. Dilution or thinning of engine oil caused by high engine temperature will leak from the gaps of engine friction pairs, resulting in low engine oil pressure. Solution: Change the oil or overhaul the cooling system.

4. Oil leakage from tubing, damage to oil pump or excessive wear of parts will all reduce the oil suction and pumping capacity, or even not at all, resulting in low or no oil pressure. Solution: overhaul.

5. Excessive clearance between crankshaft and large and small tiles leads to oil leakage and low oil pressure. Solution: overhaul.

6. The spring of pressure limiting valve or pressure relief valve is too soft, or the valve function disappears or weakens due to the damage of hairpin or steel ball, which leads to the decrease of oil pressure. Solution: replacement and maintenance.

7. The oil sensor plug, pressure gauge or circuit fault leads to low oil pressure. Solution: Replace the inspection.