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2001 jeep grand cherokee oil pressure gauge drops
In this case, check whether the low pressure fuel pressure is normal. The normal pressure cannot be less than four. If it is normal, check the high-pressure pump and fuel injection nozzle. The fuel injection nozzle needs to be disassembled to maintain the pressure and observe whether there is oil dripping. Whether the fuel injection nozzle is blocked, causing poor atomization. This is usually caused by the low-pressure pump. First connect the fuel pressure gauge for measurement. Is the fuel pressure about 3.5~4? If the pressure is lower than 4, it is recommended to replace the fuel pump. After connecting the fuel pressure gauge, wait for one or two hours to observe whether the fuel pressure drops. If the pressure is not maintained, the fuel pump also needs to be replaced. Occasional stalling may occur during normal driving, which has a lot to do with pressure. Determine whether the plug voltage of the oxygen sensor changes between 0.1~0.8.
Oil pressure too low:
1 The water temperature is high.
2 The oil pump is aging.
3 The oil filter element is clogged.
4 Oil pump or oil filter pressure limiting valve pressure is low or oil leakage.
5 Idler shaft in timing gear Idler shaft sleeve is worn.
6 The valve camshaft sleeve is worn.
7 Worn rocker shaft sleeve.
8 Engine oil is thin.
9 The oil quality is poor.
10 The oil suction cup is blocked.
11 There is water in the oil.
12 Lack of engine oil.
13 The oil gauge is damaged or blocked. The oil pump is faulty. Due to the wear of the oil rotor, the oil pressure is too low at low speeds, so the oil gauge alarms. When the engine speed is above 1000 rpm, the oil pump speed increases and the oil pressure increases, so the alarm is released. It is recommended to replace the oil pump. Improper use of the engine oil label. When the ambient temperature is high and the concentration of the used engine oil is too thin, it is easy to cause an oil alarm. It is recommended to replace the engine oil with the same ambient temperature.
If the oil pressure control circuit of Grand Cherokee engine is stuck in the open position, it is possible that the oil pressure solenoid valve is stuck due to excessive oil impurities.
Excessive oil impurities: During the long-term operation of the engine, the iron filings and other impurities generated enter the engine oil, which will lead to excessive impurities in the engine oil and blockage of the oil pressure solenoid valve. The service technician lifts the vehicle with a lift, removes the oil pressure solenoid valve, and checks whether the oil pressure solenoid valve is blocked.
Solution: Clean the oil pressure solenoid valve. During the warranty period, the vehicle can be handled at the 4S store for free, or the oil pressure solenoid valve can be replaced directly.
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