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oil preasure light blinking. 1999 deville


caddyon20s

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today after i went to my local shop to get my car inspected my oil light pressure light kept on blinking at idle,, my car runs good i didnt feel any difference only the preasure light was blinking only at idle why could that be?? please help.

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Several cases of an oversensitive oil warning light have been solved here by changing the switch on the oil filter adapter. Apparently sometimes it gets battered by road debris or oil filter wrenches and starts leaking, and blinking the oil pressure light at idle.

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Hot weather and high mileage can lead to oil pressure problems as the oil thins out and the tired pump can't keep up. I swiched to 10W40 during the summer and the problem went away.

Scott

1996 El Dorado

2006 STS

2000 Corvette

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Hot weather and high mileage can lead to oil pressure problems as the oil thins out and the tired pump can't keep up. I swiched to 10W40 during the summer and the problem went away.

I agree, your case half seals have probably shrunken, change the oil and use either 10W40 or Delvac 15W40, mine was blinking badly after I did all that work (ISS speed sensor) over a month and it was not until I moved to 15W40 that it stopped. Regis and I talked about it and he felt the seals shrinked.

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so its nothing to worry about then??? yeah it was very hot today here in kansas city 100 degrees and i got 105 kmiles on my caddy, and yes my nothstar leaks arround the sensor that goes buy the oil filter ima clean it and see if that helps, plus i need to change my oil anyways ive run 3kmiles on my current oil.. thank you guys you guys are great help.

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Change the oil pressure sensor, but it probably won't make a difference, I have used two, an aftermarket and an OEM and neither made a difference. My car sat for over a month not running and with the oil out, the oil light came on badly at idle, but I must note that it was in the 90's. I have 99K miles, once I changed the oil, using Delo 400 15W40, and ran with it, the blinking light stopped and I was in 60 miles of bumper to bumper traffic in 100 degree heat.. So you should be OK..once you change the oil. You can probably get away with a lower visconsity in the winter time.

I think the case half seals shrink allowing oil to leak out of the oil galley dropping the pressure, see this photo:

engine_20004.jpg

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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The other day it happen to me I was riding shotgun and jeannie saw that the oil light was blinking at idle, there were no warning messages on the display so we decided to keep driving and to moniter the guages closely as we drove the light went out and so far has stayed that way. Im inclined to believe that it will come again. In a previous post a member installed a aftermarket guage and found he was getting 10psi at idle and hes blinking light never came back. I agree this may be the way to go especially on older cars. Mike

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A side benefit of the diesel oils is that they have higher levels of ZDDP which is nice considering it has been seriously lowered in 10W30.

Mike5515, your statement confused me, you said this, 'In a previous post a member installed a aftermarket guage and found he was getting 10psi at idle and hes blinking light never came back.'

That statement is not clear to me. The guage would not have helped the oil pressure. 10 psi is very good, I think the switch turns on at 6 psi. Do you know what that member did to stop his light? Thanks, 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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Hi mike yes it is a little confusing if I remember correctly he first removed the factory switch and tested it with a shop guage at 10 psi he then installed a pipe extension to get by the motor mount and installed a aftermarket guage and it also showed 10psi. Im assuming he ran it up to the dash panel so he could moniter it from the drivers seat. Mike

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Hi mike yes it is a little confusing if I remember correctly he first removed the factory switch and tested it with a shop guage at 10 psi he then installed a pipe extension to get by the motor mount and installed a aftermarket guage and it also showed 10psi. Im assuming he ran it up to the dash panel so he could moniter it from the drivers seat. Mike

Hmm, if that is correct, that means that the OEM switch's threshold to light is too high. I don't have a problem with 10 PSI at idle in hot weather. I have a problem with ZERO psi in hot weather. I noticed that if I picked up the idle about 50 rpm the light went out. If I get this problem again, I think that a gage would be a good check.

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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Mike a while back when I became a cadillac owner I thought that they should have a oil pressure guage like the sport cars do, I also put it in this forum but upon examining the dash I could not come up with a good location for it without compromising the integrity of the interior. mike

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Mike a while back when I became a cadillac owner I thought that they should have a oil pressure guage like the sport cars do, I also put it in this forum but upon examining the dash I could not come up with a good location for it without compromising the integrity of the interior. mike

I would mount it under the hood. With the light intact, when I saw the light, I would look at the gage to see whats going on...

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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:huh: today at 6 oclock i got under the hood and since my northstar engine leaks pretty good <_< , i look at the harnesses the one by the oil pain and the one nex to the oil filter both were oily from all the oil around, i tighten them up i tryed to push them in to make good connettion, drove the car for like an hour the light didnt come back :D hopefully that was it, ima be changin my oil pretty soon probably next week so ima clean the sensors really good and change my oil thanks everyone for ur great help. no light
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  • 1 month later...

I had the same problem with the blinking oil pressure light and then the display would start chimming stop engine:low oil pressure....I disregarded the problem untill a buddy of mine did an oil pressure test....I wound up having to have a new oil pump installed...it wouldn't be a bad idea to have an oil pressure test done...better safe than sorry

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