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Join Date: May 2011
Posts: 218
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1978 SC Oil Pressure Troubleshooting Question
I have a pegged oil pressure gauge at all times all the way to 5 BAR, even when the car is turned off. Before I start troubleshooting, can I get some advice?
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11-24-2021, 03:09 AM
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Can you get a mechanical oil pressure gage reading to the right of the fan. That is where I mounted my mechanical oil pressure gauge
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11-24-2021, 04:44 AM
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11-24-2021, 04:58 AM
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If it is pegged even when the car is off, then it is most likely a malfunction at the gauge. Does the needle move at all when the battery is disconnected?
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78’ SC 911 Targa - 3.2SS, PMO 46, M&K 2/2 1 5/8” HEADERS, 123 DIST, PORTERFIELD R4-S PADS, KR75 CAMS, REBEL RACING BUSHINGS, KONI CLASSICS |
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11-25-2021, 10:56 AM
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if the needle is on top with the ignition on disconnect the connector at the oil pressure sending unit and touch the ground if it goes down it is your unit which is bad..
if it is on top with key off,do as snbush said Ivan
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1985 911 with original 501 645 miles...807 319 km "The difference between genius and stupidity is that, genius has its limits". Albert Einstein. |
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11-25-2021, 11:07 AM
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Join Date: May 2004
Location: Boulder, Colorado
Posts: 7,275
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You'll find lots of information on this if you use the search function. Posts have numerous times explained how the gauge works, how the sensor works, and what happens if the connection between the engine ground via the sensor to the gauge is broken (that is, interrupted, so no resistance to ground at the gauge (which pegs it when 12VDC is applied to the gauge).
The good news is that the most common issue is your sensor wire has come off the sensor. Or somehow there is a break in continuity before the spade lug on the gauge. The next is that the sensor is worn out (it is a rheostat, so a slider slides across a wire coil, which eventually can wear through). But that usually results in a gauge which looks OK before you start, may look OK as the oil pressure rises, and then (when the slider gets to the break) abruptly pegs. You don't describe that. Replacing the sensor is less cost and less hassle than dealing with the gauge (which pretty much can last forever, as long as you have the right model sensor for the gauge, which came in 10 bar, and later 5 bar (and psi equivalent) models. |
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11-26-2021, 07:52 PM
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It was the connector on mine, re wired it and all good
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11-27-2021, 06:16 PM
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Stella
