My wife took the Van to work and to the mail room with oil pressure showing on the gauge. Then at the mail room the guage does not buge but she went ahead and drove it home .... 1/2 mile. I checked the oil and it is full. I ran it, no oil pressure but it sounded like the valve were getting noisy so I shut it down. Any words of advice and comfort ..... Its a 94 Pontiac Transport, Engine Size: 3.1 Number of Cylinders: 6 Cylinders Drive Train: FWD Transmission: Automatic
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Re: No oil pressure indication at the gauge
The easiest thing to check would be the oil pressure sensor, (this is probably a remove and replace operation) but noisy valves sound like a problem with the oil pump. I would not drive it until you get the problem identified.
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Knowing how these gauges work , I'd say you have an instrument cluster problem not oil sender unit. 2003 - 2006 GM had bad stepper motors in the instrument cluster . If there was a problem with the oil sender the gauge would default to zero .
Engine Oil Pressure Gage
The instrument panel cluster (IPC) displays the engine oil pressure as determined by the powertrain control module (PCM). The IPC receives a class 2 message from the PCM indicating the engine oil pressure. The engine oil pressure gage defaults to 0 kPa (0 psi) or below if:
The PCM detects a malfunction in the engine oil pressure sensor circuit.
The IPC detects a loss of class 2 communications with the PCM.
the oil pressure hot on your test gauge will be below recommended pressure necessary for the proper lubrication of the engine . The control module as you say will be set higher to notify you before that pressure is reached so that there is sufficient time to shut down the engine
The sending unit is a variable resistor. When the oil pressure is normal only a small amount of voltage goes to ground through the sending unit. As the oil pressure goes down, more voltage is shunted to ground reducing the sending unit voltage and causing the gauge to indicate a lower pressure. If the oil pressure falls very low or disappears the sending unit shunts all the voltage to ground which causes the dash indicator to show no oil pressure. Now if the wire to the sending unit gets nicked, melted or cut and finds a short circuit to ground, or gets disconnected in a junction point between the gauge and the sending unit, you will get the same no oil pressure indication from the gauge. Check you wiring for a short to ground or an open connection. The same
The first thing to check it oil. The next thing to check is the pressure with a well know pressure gauge. The next thing to check is the main bearings for wear. If this is the problem, you will need to see if the vehicle is worth rebuilding an engine for or not.
. THATS USUALLY A SING OF THE OIL PUMP GOING BAD/WORN BEARING AT CRANK CAMS . WHEN ENGINES COLD THE OIL IS THICKER AND WHEN THE OIL HEATS UP IT GET THINNER CAUSING LOW ENGINE OIL PRESSURE. IF USUALLY THE LIGHTS COMES "ON" AT IDLE AT NORMAL TEMPETURE AND IT GOES AWAY WHEN ACCCELERATED. THOSE ARE SINGS OF WEAK OIL PRESSURE. ALSO CHECK THE THE WIRE TO THE OIL PRESSURE SENDER FOR RUBBING OR WEAR. HOPE THIS HELPS. THE BEST WAY TO BE SURE IS GETTING A OIL PRESSURE TESTER AT HARBOR FREIGHT THERE LIKE $20 OR SO AND TEST THE PRESSURE. AN AVERAGE SHOULD BE ABOVE 15PSI AT IDLE AND HIGHER 2500 RMS AT 22,000 35,000 PSI GOOD. HOPE THIS CAN HELP OR GIVE YOU A LEAD OR HLEP... SEND ME A FEEBACK PLEASE THANKS
You may want to hook up an external oil pressure gauge to the engine to ease your mind. This would give you a regular number of the pressure. Compare it to the factory gauge in the dash. Those in dash gauges were not all that precise. If the engine is not having bearing noise I can see nothing to worry about.