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Changed oil & filter now no oil pressure

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Old 11-06-2014, 08:24 PM
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DonS
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Default Changed oil & filter now no oil pressure

Final stages of getting ready for Third Coast. I changed to Mobil 1 15w-50 and a new filter. Fired it up, no oil pressure (but sounds fine). Always had 5 bar at start up before with a little bouncing around then steady 3 or so.

No warning light. Turning the key the gauge moves from bottom to zero so the gauge is working? It's two separate circuits for the gauge and the light so I do have pressure, correct? Bad sending unit?
Old 11-06-2014, 08:42 PM
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GlenL
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probly touched the wire to the sender and busted something. It's right there above the filter.
Old 11-07-2014, 02:22 AM
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Check the connections at the sending unit, probably undid the connections while changing the filter.
Old 11-07-2014, 03:46 AM
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OTR18WHEELER
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Sending unit wire connection was also my first thought.
,but if I may be the one to ask first, are you sure you installed the New filter, is there a puddle of oil under the car about the size of 8 quarts?
Old 11-07-2014, 09:03 AM
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DonS
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I checked three times afterwards and nary a drop but thanks for asking, otr18wheeler. And the puddle has already been cleaned up. Not having a 2-gallon catch pan I used my 1 gallon and the biggest kitchen pot. But during the switch over I still spilled a cup or so. Amazing how it s p r e a d s. I'll check the connections this evening.

Last edited by DonS; 11-08-2014 at 08:56 AM.
Old 11-07-2014, 12:37 PM
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StratfordShark
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If it is the sender connection, then I wish mine could be dislodged so easily! I wanted to remove mine to renew gasket (very greasy up there, and I didn't know if it was sender o-ring, or the oil pan gasket which I subsequently cleaned up and changed), but it wouldn't budge!
Old 11-07-2014, 02:45 PM
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Tony
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Originally Posted by Bilal928S4
Check the connections at the sending unit, probably undid the connections while changing the filter.
perhaps a bit OT but what pins do they connect to in the pod? anyone know off hand. Id like to check the continuity on mine. It has NEVER worked.
Old 11-07-2014, 07:42 PM
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dr bob
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Tony, those pass through the 14-pin under the hood. Easier to check there IMO. Don't have wiring diagrams for your car handy to give you pinnumbers, sorry.
Old 11-08-2014, 08:54 AM
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DonS
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The previous owner had been here. The wiring had frayed and had been patched to the connection.

Old 11-08-2014, 10:12 PM
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928 at last
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Default That's just grim..

Originally Posted by DonS
The previous owner had been here. The wiring had frayed and had been patched to the connection.

You really need to clean that area up and re&re the wiring. If it's the sender then just swap a new one in. I think it's the wires...but no way to tell with that amount of yutz in there....
Old 11-09-2014, 10:32 AM
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GlenL
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A really bad spot for a butt splice. Too much gunk and vibration. I'll do them inside the car but usually solder.
Old 11-09-2014, 08:51 PM
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DonS
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Originally Posted by 928 at last
You really need to clean that area up and re&re the wiring. If it's the sender then just swap a new one in. I think it's the wires...but no way to tell with that amount of yutz in there....
Yes, it's the wire ends. My temp patch gave me a good connection/readings and got me to Third Coast and back but I agree the wiring needs to be re-done with new ends. The sender is good but we'll see if the connection is too deteriorated once cleaned.



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