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jbs911cab
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Oil Pressure Gauge - Again
jbs911cab replied to jbs911cab's topic in 996 Series (Carrera, Carrera 4, Carrera 4S, Targa)
Thanks for the feedback. I will check the pressure sensor again to see if I got a bad one. If the problem turns out to be the pressure gauge, can it be replaced separately or does the entire gauge cluster need to be replaced? -
Oil Pressure Gauge - Again
jbs911cab replied to jbs911cab's topic in 996 Series (Carrera, Carrera 4, Carrera 4S, Targa)
The actual oil pressure is definitely not dropping to zero or the idiot light would come on. I don't have a circuit diagram of the pressure sensor but I assume it has one circuit for the idiot light that is an on/off switch connected to the small connector. When there is pressure, the switch is open turning off the light. The other circuit is a variable resistance circuit that varies with oil pressure and is connected to the pressure gauge. With engine running (cold) the pressure is initially very high with the cold, thick oil (usually 5 bars on the pressure gauge), therefore the resistance to ground should be high (or could it be the reverse??? hmmm - need to go measure). Anyway, since I have 12 volts at the large wire connector, I'm assuming that I don't have a wire, connector or corrosion problem (this is a CA car). That leaves the variable resistance sensor circuit in the pressure sensor or the pressure gauge. Will go measure the resistance across the pressure sensor tonight and see what it tells me. Does anyone have a circuit diagram of the pressure sensor circuit???? Thanks for any help. -
Oil Pressure Gauge - Again
jbs911cab replied to jbs911cab's topic in 996 Series (Carrera, Carrera 4, Carrera 4S, Targa)
Replaced the sensor already - that's what got the gauge working for a couple of days. Doubt the new unit failed so quickly. So now looking for the next step. -
Just joining the 996 forum. Sold my 85 911 and moved up to an 03 996 cab - wow what a difference :jump::) Anyway - am faced with the oil pressure gauge problem many have discussed before. My problem - oil pressure gauge went to zero just after getting the car (87K miles) (minor heart attack as I had visions of the engine grenading and a $20K bill in front of me). No oil pressure light. Went to this forum for some great advise - figured out how to replace the oil pressure sender without too much problem. Pressure gauge worked fine for a few days. On the way home from work it dropped close to zero again but fluctuated a little bit. Oil idiot light is off. Continued home and began diagnostics. With engine on (no oil pressure showing) - disconnect large wire connector from sensor and measure 12V between wire connector and ground. Ground the wire connector while engine is running and get oil can warning but no fluctuation in pressure gauge. Oil can warning goes away when I disconnect ground. With key on and engine off I get 12V to ground. When I ground the wire, there is no fluctuation in the gauge. I'm guessing a bad oil pressure gauge at this point but would appreciate any advise on next steps. Thanks for any suggestions.