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oil pressure light & bell remain on


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hi i have installed 2 new pressure switches & light & bell remain on. my shop says they cannot mechanically test for pressure because of location of oil filter. i am not hearing any noises indicative of no oil. wires to switch are ok. any sugestions would be greatly appreciated. thanx for reading this. olegert.

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First check for any DTC codes that might be set

Then you need to determine if you do or do not have oil pressure. There is a port on the oil filter adapter, you need to get the proper fitting and connect an analog gage on the engine to see if you have pressure. Your shop is wrong I believe. There HAS to be a port to test for oil pressure. This will eliminate a potential electrical problem, when you determine whether or not you have oil pressure.

If there is NO pressure, it is possible that the pressure relief valve is open and we have a procedure that can/should fix that.

What oil are you using? Viscosity and type, synthetic or dino?

Has any work been done that required the crank pulley to be removed?, the oil pump is behind the crank and the crank bolt torque is what causes the oil pump drive to turn.

What brand of oil filter are you using, oil filters have a by pass on them and some have stated that they get low oil pressure by some filters, I kind of doubt this, the filter will by pass and NOT FILTER but it won't drop pressure

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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First check for any DTC codes that might be set

Then you need to determine if you do or do not have oil pressure. There is a port on the oil filter adapter, you need to get the proper fitting and connect an analog gage on the engine to see if you have pressure. Your shop is wrong I believe. There HAS to be a port to test for oil pressure. This will eliminate a potential electrical problem, when you determine whether or not you have oil pressure.

If there is NO pressure, it is possible that the pressure relief valve is open and we have a procedure that can/should fix that.

What oil are you using? Viscosity and type, synthetic or dino?

Has any work been done that required the crank pulley to be removed?, the oil pump is behind the crank and the crank bolt torque is what causes the oil pump drive to turn.

What brand of oil filter are you using, oil filters have a by pass on them and some have stated that they get low oil pressure by some filters, I kind of doubt this, the filter will by pass and NOT FILTER but it won't drop pressure

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hi thanx for the info have ac delco part in hand. will report preogress. ole gert

What AC DELCO part, the oil filter? This is NOT likely the oil filters fault

It would help if you answered the rest of my questions above

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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hi i am installing an OEM pressure switch. WIX filter,CASTROL5-30 oil, no work has been done to engine,if switch does not fix problem i have an appt. for diagnosis on fri. i will let you know the outcome, maybe you fill me in your other fixes you mentioned. thanx again,olegert.

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I may have spoken too soon, this no oil pressure 'fix or work around" for clearing the pressure relief valve and priming the oil pump appears to be only for the 93 to 95 model years, but you should check out this thread out anyway. If anyone knows if this "fix" can solve the NO OIL PRESSURE problem in later models please let this member know.

See this thread for the NO OIL PRESSURE 'fix'

http://caddyinfo.ipb...h=1entry10283

If this does not work, tell your mechanic to make sure the crank bolt it torqued to spec, otherwise the oil pump drive can slip.

It is GOOD news that you are NOT hearing any chatter from the engine, maybe its just an electrical problem. DO YOU KNOW HOW TO CHECK FOR YOUR TROUBLE CODES?, you dont need a scanner, do you know?, have you checked?

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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I believe that procedure will work on any Northstar with a stuck open check valve.

Thanks Ranger, that's great

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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hello all you good people. i have installed a ac/delco pressure switch and all is well with the cadillac world!! thanx again all the help from this forum. olegert

Olegert, I am glad to hear that. Tell us what happened, did you use an aftermarket pressure switch, your first post said it was changed twice? It is a switch, not a sender. It turns on at 5 psi. Mike

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Thanks for the follow-up, it is always good to hear an outcome; especially when it is good news.

Chuck

'17 XT5, '04 Bravada........but still lusting for that '69 Z-28

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