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Registered
Join Date: Apr 2007
Location: Buffalo, NY
Posts: 1,635
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Oil Pressure Gauge
One day last year my Oil Pressure Gauge pegged out past the 5 Bar mark. It used to work very well. I am guessing it to an electrical problem. When the key is off it drops right to 0. As soon as the key is turned to the on position with the car NOT running, it pegs right to the top.
The car runs great so I am guessing an electrical problem somewhere. Both wires are screwed onto the sensor and look clean. Could this be a problem with the ground? A problem with the gauges itself? Any help here would be great! 
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John '87 944 N/A (first Porsche) '95 E-350 Diesel '03 S-Type Jag 3.0 '03 Taurus SES '06 Eddie Bauer Explorer RIP SoCal |
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04-26-2009, 05:10 AM
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That Guy
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Most likely is the pressure sender on the oil cooler, when they go bad they cause the gauge to peg. To double check, remove the the wire lead for the pressure sender (one lead is for pressure, the other is for the warning light) and ground it directly to the block. With the key 'on' the gauge should read zero.
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Jon 1988 Granite Green 911 3.4L 2005 Arctic Silver 996 GT3 Past worth mentioning - 1987 924S, 1987 944, 1988 944T with 5.7L LS1 |
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04-26-2009, 07:29 AM
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Registered
Join Date: Mar 2000
Location: Riverdale, GA
Posts: 363
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I experienced chaffed wiring. The wring from the sending unit up and across the engine and under the MAF. Wiring was chaffed in the area behind the ignition distributor.
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85.5 944na Automatic V-65 Magna 94 Impala SS |
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04-26-2009, 07:55 AM
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Registered
Join Date: Apr 2007
Location: Buffalo, NY
Posts: 1,635
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Just an update. The gauge stays pegged all the time unless the battery is disconnected.
I will try disconnecting and grounding to the block to see if it goes to zero. If it does go to zero is it a bad wire? Could I just leave that wire grounded and the gauge will work again? Thanks for the help guys.
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John '87 944 N/A (first Porsche) '95 E-350 Diesel '03 S-Type Jag 3.0 '03 Taurus SES '06 Eddie Bauer Explorer RIP SoCal |
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04-26-2009, 04:23 PM
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Registered
Join Date: Mar 2000
Location: Riverdale, GA
Posts: 363
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If the indicator wire is shorted or grounded, gauge will peg with ignition on.
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85.5 944na Automatic V-65 Magna 94 Impala SS |
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04-27-2009, 07:38 AM
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The Kraut Burner
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