'96 DeVille oil pressure indicator light

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'96 DeVille oil pressure indicator light

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'96 DeVille oil pressure indicator light - 5/31/2008 8:19:58 AM

strabo40

Posts: 31
Joined: 11/27/2006
Status: offline

I have a '96 DeVille with 117,000 miles on it and after not driving the car regularly for about 2 weeks with no known problems and a recent oil change, my oil pressure indicator light flickers on and off when the RPMs get down to about 625-650. Once the RPMs increase to about 800 the indicator light goes off and stays off. BTW, this happened yesterday and I was also running the air conditioner.

For the oil change, I change the oil and filter myself and have been doing this for a long time. I use Castrol Syntech and Fram oil filter. The oil level is where it should be.

Is this an indication of a weak oil pump? What else could this be?

Thanks

Post #: 1

RE: '96 DeVille oil pressure indicator light - 5/31/2008 10:00:30 AM

carnut

Posts: 350
Joined: 2/23/2008
Status: offline

Wrong oil viscosity.

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2 1984 Eldos, 1991 Allante, 88 Allante (sold)

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Post #: 2

RE: '96 DeVille oil pressure indicator light - 5/31/2008 10:46:29 AM

strabo40

Posts: 31
Joined: 11/27/2006
Status: offline

Wrong oil viscosity? I used 10W30 just like what is written on the cap and in the manual. Should I use a different viscosity than what the owner's manual and cap says due to high mileage?

(in reply to carnut)

Post #: 3

RE: '96 DeVille oil pressure indicator light - 5/31/2008 3:58:32 PM

Texan4Life

Posts: 37
Joined: 1/17/2008
Status: online

The only two things I can think of are the oil pressure sending unit (or wiring to the unit) or a plugged oil suction screen. Since this car has probably had synthetic all its life, I would start with the oil pressure sending unit.

(in reply to strabo40)

Post #: 4

RE: '96 DeVille oil pressure indicator light - 5/31/2008 4:50:05 PM

strabo40

Posts: 31
Joined: 11/27/2006
Status: offline

Here's an update...this only occurs when I am running the air conditioner. With the air conditioner off, the rpms are still around 650. Kind of weird.

(in reply to Texan4Life)

Post #: 5

RE: '96 DeVille oil pressure indicator light - 5/31/2008 7:15:23 PM

carnut

Posts: 350
Joined: 2/23/2008
Status: offline

verify pressure with a manual gauge screwed in where the oil sender is. Based on reading probably replace sender.

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2 1984 Eldos, 1991 Allante, 88 Allante (sold)

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Post #: 6

RE: '96 DeVille oil pressure indicator light - 5/31/2008 10:46:18 PM

jerrymac

Posts: 55
Joined: 4/6/2008
Status: offline

Based on my own years of vehicle ownership, I would suggest you 'pitch' the Fram filter.
I have a 97 Eldo ETC and 3 Ford F250 4X4 pickups. I always use AC Delco parts on my
Eldo and Motorcraft on my Fords. I got a deal once on some Fram filters and bought them,
and after an oil change on all 4 vehicles each one of them had a 15 to 25 p.s.i drop in oil
pressure with the Fram filters installed. I pitched the Frams and went back to OEM and
the oil pressure was normal again.

(in reply to carnut)

Post #: 7

RE: '96 DeVille oil pressure indicator light - 6/1/2008 12:25:57 PM

carnut

Posts: 350
Joined: 2/23/2008
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I agree. Replace filter with DELCO prior to oil sender replacement. Report back.

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2 1984 Eldos, 1991 Allante, 88 Allante (sold)

(in reply to jerrymac)

Post #: 8

RE: ''96 DeVille oil pressure indicator light - 6/6/2008 4:16:40 AM

strabo40

Posts: 31
Joined: 11/27/2006
Status: offline

Yesterday I replaced the Fram oil filter with a Mobile 1 oil filter and test drove the car with the air conditioning on, and the oil pressure light did not flicker. The one difference that I had forgot about was that the Fram oil filter I got this last oil change was their extended life filter instead of the regular orange one.

Anyway, thanks for the help. I wouldn''t have thought about changing the oil filter.

(in reply to carnut)

Post #: 9

RE: ''''96 DeVille oil pressure indicator light - 6/7/2008 7:44:40 PM

Texan4Life

Posts: 37
Joined: 1/17/2008
Status: online

That is very interesting, thanks for sharing. I would not have even thought that the oil filter (being new and most likely a bypass type) would cause such a problem.

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1990 Cadillac Sedan Deville. 4.5L V8 FI. 213,000 miles

(in reply to strabo40)

Post #: 10