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78 928
Join Date: Apr 2020
Posts: 4
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1978 928 oil pressure
My bar gauge seems to read correctly but the idiot light for oil pressure now flickers at times. Any thought how to check this?
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04-09-2020, 09:16 AM
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Registered
Join Date: Mar 2010
Location: Texas
Posts: 2,135
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Check the 2 wires on the oil gauge sending unit for grounds and shorts and bare spots.
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John Curry (Drift King) 928OC member Grand Prix White 1994 GTS AT (The GTS) Black 1989 GT (The GT) and Cobalt Blue 1989 S4 AT (The Blue Car) 1986 Euro AT Indishrot 1984 Euro S AT (The Stepson) and Black Metallic 1984 Euro S 5 speed (The Schwartz) |
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04-09-2020, 10:35 AM
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Oil Pressure -
Hey Thalfon - Does your oil pressure gauge gradually drop as your engine warms up ?
Don't know if this helps but along with checking for a damaged (bare spot touching ground) wire going to the low pressure warning light - A while back a friend had purchased a high mileage 80 model 928 that had been parked for many years. Once we had it running, I noticed that his oil pressure gauge needle would immediately peg and stay at the top as soon as the key was turned on. Once warmed up, his oil pressure warning light would flicker at idle but the gauge showed max pressure. It turned out that the two wires to the gauge sending unit were connected backwards. My wife and I just returned from a couple of weeks in Estes Park, Co. Great trip but got some strange looks with Texas plates on Miss Purdy. Now that we're back home and everybody is basically on "Wuhan Coronavirus" semi- house arrest, it sucks  Good Luck - Michael
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1984 928S - "Miss Purdy" 1987 911SC - "Frau Helga" 1986 930 - "Well Hung" 1975 911 Targa "Blue" Last edited by JK McDonald; 04-09-2020 at 12:13 PM.. |
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04-09-2020, 12:06 PM
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78 928
Join Date: Apr 2020
Posts: 4
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JK McDonald,
The oil pressure gauge seems to work fine and operates normally. The idiot light only seems to flicker when am at higher rpms, never at idle. I have not been under the car yet to check the condition of the wires but, no one has worked on the car since this started to happen. Todd |
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04-09-2020, 12:15 PM
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Sending Unit -
Hey Thalfon - If I remember correctly - the oil pressure sending unit not only had it's two wires connected backwards but the sending unit itself was determined to be defective.
Just a thought but you might remove the sending unit and attach a mechanical gauge as a pressure test of the oil pump circuit. Some owners have also changed to a slightly thicker oil. I run 20W50 in the Texas heat. Good Luck - Michael
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1984 928S - "Miss Purdy" 1987 911SC - "Frau Helga" 1986 930 - "Well Hung" 1975 911 Targa "Blue" |
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04-09-2020, 12:43 PM
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78 928
Join Date: Apr 2020
Posts: 4
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JK McDonald,
I will check the wires and then hook up a mechanical gauge before I buy a new sender. Thanks for your insight. Todd |
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04-09-2020, 03:51 PM
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