Oil Pressure, low |
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Oil Pressure, low |
minnesota loon |
Aug 26 2012, 11:21 AM
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#1
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Member Group: Members Posts: 111 Joined: 30-September 07 From: white bear lake mn. Member No.: 8,173 |
I have installed a gauge, about a year ago,It is a vdo works great. Just recently my oil pressure dropped from 60 to about 20. When i first start the car green light stays on for about a minute. I don't hear any loud knocking so I know it is getting oil. After that the pressure goes up to about 10 psi. When i drive it the pressure goes up to 20 to30 psi. It does not fluctuate much. Yesterday i changed the oil and when i first started the car the pressure quickly went up to about 40 psi. When i took the car off the stands and started it was back to 10 psi. I don't think it is the gauge,ideas? could it be oil pump? When i drove the car it ran really well. No loud engine noise. Oil temps are normal.
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Black22 |
Aug 26 2012, 11:39 AM
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#2
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Senior Member Group: Members Posts: 886 Joined: 1-November 07 From: Creswell, OR Member No.: 8,290 Region Association: Pacific Northwest |
Sender?
If it were me, I wouldn't drive it until I found out what was going on. |
Java2570 |
Aug 26 2012, 11:47 AM
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#3
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Senior Member Group: Members Posts: 649 Joined: 7-May 11 From: Fishers, IN Member No.: 13,035 Region Association: Upper MidWest |
Clean out your sender and see if that makes any difference... and also make sure you have good wire connections on the sender. I had a similar issue with my car but it
was a consistent sluggish reading on my gauge. It would take about 15 seconds for the gauge to read the oil and the idiot light would stay on. It turned out to be some debris in the sender. Yours sounds more like wiring to me though.... |
Mike Bellis |
Aug 26 2012, 12:10 PM
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#4
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Resident Electrician Group: Members Posts: 8,345 Joined: 22-June 09 From: Midlothian TX Member No.: 10,496 Region Association: None |
Sender ground? Maybe, weird things happen with bad grounds.
Pick up tube? Maybe, higher pressure on jack stands is suspicious. Bad sender? Maybe, clean it first. Oil Pump? Not likely but maybe, self machining would have other consequences. |
brant |
Aug 26 2012, 12:23 PM
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#5
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914 Wizard Group: Members Posts: 11,623 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains |
what is the motor history
I would verify the guage, but it could also be a worn motor doesn't sound good you might want to take the old oil filter and tear it open.(don't use a saw that leaves debris) I have one pressure guage on the end of a hose, that I can screw directly into the motor oil pressure spot and measure pressure direct for testing (good for elimating all questions about wiring) |
76-914 |
Aug 26 2012, 01:06 PM
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#6
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Repeat Offender & Resident Subaru Antagonist Group: Members Posts: 13,501 Joined: 23-January 09 From: Temecula, CA Member No.: 9,964 Region Association: Southern California |
(IMG:style_emoticons/default/agree.gif) Good advice. I keep one in my garage. Always use it for rebuilds. Too damned important to trust electrical gages/senders.
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Spoke |
Aug 26 2012, 01:47 PM
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#7
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Jerry Group: Members Posts: 6,978 Joined: 29-October 04 From: Allentown, PA Member No.: 3,031 Region Association: None |
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minnesota loon |
Aug 26 2012, 01:59 PM
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#8
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Member Group: Members Posts: 111 Joined: 30-September 07 From: white bear lake mn. Member No.: 8,173 |
I took the sender out and checked it out looks ok oil in tube running to it. When i hooked it up again no oil pressure Im thinking it is the sender at fault.
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minnesota loon |
Aug 26 2012, 02:14 PM
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#9
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Member Group: Members Posts: 111 Joined: 30-September 07 From: white bear lake mn. Member No.: 8,173 |
Any way to test the sender?
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brant |
Aug 26 2012, 04:13 PM
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#10
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914 Wizard Group: Members Posts: 11,623 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains |
I would be very afraid to run the car at this time
I would buy a mechanical guage that you can thread into the stock location for testing purposes.... just because you don't have rod knock, does not mean you have oil pressure do you still have the stock single pole sending unit you might see if that changes the green stock warning light. you can pull all of the plugs and run that test by just cranking the motor with the starter enough to build 3psi. the case is NPT buy a brass tube of the same size that you can screw in rigid for static testing purposes.... bring that up to a brass block that a mechanical oil pressure guage can screw into... (or you can use a flexible hydraulic hose if you want) but I would run the mechanical test first then if you have pressure then replace your sender... brant |
Mike Bellis |
Aug 26 2012, 07:53 PM
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#11
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Resident Electrician Group: Members Posts: 8,345 Joined: 22-June 09 From: Midlothian TX Member No.: 10,496 Region Association: None |
I took the sender out and checked it out looks ok oil in tube running to it. When i hooked it up again no oil pressure Im thinking it is the sender at fault. Could be no ground at the sender. If you used teflon tape on it, may not be grounded any more. Try connecting a ground witr to the sender, hole the wire in place with a hose clamp. Only need to ground the body. |
minnesota loon |
Aug 29 2012, 04:32 AM
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#12
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Member Group: Members Posts: 111 Joined: 30-September 07 From: white bear lake mn. Member No.: 8,173 |
Problem solved it was a clogged feeder tube.When i installed the sensor i used a grease gun hose. I used a piece of wire stripped and ran it down the hose. After that it worked fine. Thanks every body.
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