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What causes a 2003 Dodge Ram 1500 oil pressure gauge to drop to zero when stopped or low RPM?
Wiki User
∙ 14y ago
First, an oil pressure gauge reads pressure in the engine oil lubricating system. IF it shows low, or no pressure, then that is what it means.
Most vehicle oil pumps are mechanically driven off the engine so when the engine is OFF [I have to assume that is what you mean by "stopped"] the pump is not operating [turning] and thus there can be no pressure to be indicated.
The oil pump output, and thus the pressure in the system, is directly proportional to the engine RPM. The higher the RPM, the higher the pressure indicated, and the lower the RPM, the lower the indicated pressure.
IF the pressure is indicating very low, or none, there could be several causes, but... the most common cause is that the engine idle speed is set too low, and requires readjustment.
On the other hand, it could be be caused by wear in the engine areas through which the oil flows and lubricates, or it could be that the oil has broken down, lost its viscosity and become too "thin."
As a first step in remedying the issue, or determining the cause, I suggest you replace both the oil [with the vehicle manufacturer's recommend oil] and the oil filter. IF that does not solve the problem, my next step would be to have a qualified engine performance technician check the idle speed and if necessary, properly reset the idle speed.
If these two preventive maintenance steps do not correct the problem, then you need a PROFESSIONAL engine mechanic to troubleshoot the engine for other causes.
Wiki User
∙ 14y ago
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