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Registered
Join Date: May 2001
Location: Juncos, P.R.
Posts: 84
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Oil pressure gauge needle bouncing
Hi everyone:
I have a 1985 911 Carrera and the oil pressure needle started to bounce erratically. Sometimes it stuck past the number 5 in the scale and when decelerating it went down. I changed the oil pressure sender for a new one and it cleared the problem for a while, then started again. Now when I accelerate and the needle reaches the number 4 in the scale it bounces up and down. If I maintain the pressure about 4 it remains normal, no bounce. What can be happening? Any help would be appreciated and thanks for your attention. |
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12-03-2001, 05:53 PM
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Senior Member
Join Date: Feb 2000
Location: Lacey, WA. USA
Posts: 25,309
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These German pressure gauges and sending units have a reputation for jerky movement. "They" say that for truly precise and reliable oil pressure readings you need to use a mechanical gauge. It may help to just make sure your electrical connections are excellent.
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Man of Carbon Fiber (stronger than steel) Mocha 1978 911SC. "Coco" |
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12-03-2001, 10:04 PM
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Back in the saddle again
Join Date: Oct 2001
Location: Central TX west of Houston
Posts: 56,334
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It sounds like your sender is still working OK, but as Superman said I would check the connections and wires associated with the gauge.
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Steve '08 Boxster RS60 Spyder #0099/1960 - never named a car before, but this is Charlotte. '88 targa  SOLD 2004 - gone but not forgotten
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12-03-2001, 11:54 PM
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Registered
Join Date: Jun 2001
Location: France
Posts: 95
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I had the problem with both pressure and temp gauge, with a "sticky" needle and erratic movements... I fixed it by blowing the mecanism with a computer air bomb (carefully!), and dropping a tear of 3in1 oil on the axis of the needle. To do that, I previously put the tear on a sewing (I suppose it's the right word) needle, and then put this needle on the axis; by capillarity, the oil "jump" to the axis...
I do not know if it will solve your problem, but it did solve mine 
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Olivier. '76 Carrera 3.0 |
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12-04-2001, 01:00 AM
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