I have a 2005 Dodge 2 wheel dr 4.7 liter- I have had problems wiht it
staaling - and then recently my oil pressure gauge will drop to 0- when
I stop , from time to time. I replaces the Throttle postition sensor-
which helped for a couple days, and now after 2-3 days- I am having the
same problem with my oil pressure gauge showing 0 oil pressure- but the
truck rusn fine. What can I check next?
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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.
John, Low oil pressure can be many things. BUT, first you need to hook up an oil pressure gauge just to make sure its not the oil pressure sensor. If you have already put a new sensor on and it still has low oil pressure then you still need to check pressure with a gauge to make sure its not in the wiring or connector. If you find good oil pressure with the gauge then it need to be check to see why the pressure is low. It could be oil pump OR bearing issue. Hope this helps and please visit my auto-repair-website here: http://www.bigasautorepair.com/
If the engine is not making any noise then it is likely not a real oil pressure problem. Just to make sure have the pressure checked by a shop with a mechanical test gauge and if found to be inspect replace the sending unit and that should in most cases cure the problem. I assume this is a pressure indicator.
Did you compare what your dash gauge read when it was acting up and compare it to the manual gauge at the same time? I know you said you used the manual gauge and it read fine so if you get a proper reading out of the manual gauge and an improper reading out of the dash gauge then your dash gauge needs addressed.
remove the oil sending unit and install a oil pressure gauge.You did not specify the motor so you can find it by the oil filter.remove the oil sending unit and install the gauge.Let the motor get to operating temperature and check pressure.Should be @ idle over 5 psi.5 is minimum.@ 3000 rpm should be 45-105.Hope this helps.Good luck.
First make sure your drain plug and filter are installed and tight, then add 2 liters of oil and check to see if there is any showing on the dipstick. Add one liter at a time and recheck the dipstick. Bring the level up to the full mark on the dipstick. Now start the engine and observe the oil light(turn off) or pressure gauge(pressure goes up) then turn off engine. If neither happens after about 10 seconds, shut off engine and check for leaks or other malfunctions. If all is O.K. then recheck oil level on dipstick. It should be somewhere between the upper and lower level, usually indicated by crosshatch marking. Add oil to bring oil level to full mark. Small amount at a time. Most small vehicles only take about 3.5 to 4 liters.