Cadillac Owners Forum banner

1 - 8 of 8 Posts

·
Registered
96 STS Seville pearl white
Joined
·
46 Posts
Discussion Starter #1
96 Seville STS 66,000 mi, mobile 1 10-30, recent sparkplug change, drive my ride maybe once a week with no major problems ever. No problems with starting or no abnormal noises. After 1/2 hour in traffic at a stop light I noticed the low oil pressure light would flicker then come on steady, again no abnormal noises, the light would go away if I rev the RPM's to 1000 but would return when back to normal idle. I also noticed the tempature went up very slightly. STOP ENGINE came on the display a little after that, stoped the car and verfied oil levels/coolent were normal. I descided to let the car cool down and got a beer, hour later drove home with no problems. A few days later I took her out again and same scenario like before at a traffic light. I see other threads recomending replacing the sending unit, I see that if the low pressure light came on once I turned on the engine, but in my case it only happend after driving for awhile. Any suggestions anyone?
 

·
Registered
1999 Cadillac DeVille
Joined
·
279 Posts
So if there was no noises I'm thinking oil pressure sensor, pull your codes you don't need a scanner its built into your car if you need directions see the sticky at the top of the page, after pulling the codes post back
 

·
Registered
99 Seville STS, 08 STS4 N* 1SG F55
Joined
·
3,516 Posts
Slight temperature rise in traffic is not abnormal. If you have not done anything lately that would affect the oil pump (like pulling the crank pully or major engine service) I would start by replacing the sensor.
 

·
Cadillac Technician
none
Joined
·
11,051 Posts
I recommend against messing around with this.
You have 2 options.

1. Replace the oil sending unit and re-evaluate.

2. Take it to a mechanic or get yourself a mechanical oil pressure gage and check the ACTUAL oil pressure against published specifications. You could have a leak somewhere that is causing a loss of oil pressure at low rpm. Left unchecked this can cause major damage or cause a complete lack of oiling at a point distant from the pump on the other side of whatever is losing pressure.
 

·
Registered
96 STS Seville pearl white
Joined
·
46 Posts
Discussion Starter #5
thanks for all the support folks! Ok, I ran the codes... nothing! I went and got a replacement sensor (10 bucks AC Delco). however... if anyone hasn't replaced a oil pressure sensor on a 96 seville yet, just looking at it... its a pain in the BUTT! The sensor is close to the oil filter and there is a engine mount bracket that is blocking more than half the sensor, the electricial conector is blocked also, and I do not have a open end wrench big enough to remove the sensor, very tight...it is impossible to remove it unless I remove the engine mount/braket. this means you have to put the car on jacks stands and put support jack to hold up the motor to remove/loosen the mount/braket. looks like if I cannot get a open end wrench big enough, I will have to use something like a monkey wrench. why or why would someone want to put a $10 sensor in a place like like that?
 

·
Cadillac Technician
none
Joined
·
11,051 Posts
They make an oil sending unit socket that WILL fit on there but it is a pain.
You CAN do it without doing all that work.
You'll need a pair of channel locks and some patience... but it can be done.
I have a socket in my tools so I use that but there are 2 or 3 that it could be and sometimes the old one doesn't match the new one *sigh*.
You can try to look at the new one and the old one and see if they look the same, look closely.
Go to a parts store and try to match up the sender with the right sender socket and see if you can sneak it on there. I have done it so I know it is possible.
The socket probably costs more than the sending unit.
 

·
Registered
96 STS Seville pearl white
Joined
·
46 Posts
Discussion Starter #8
ok... it was the sensor.

pain is the ass, but i removed it, hope the electrical connector clip is facing down or else your going have move fun. Forget using the correct wrench... i cannot see how you would fit it anyways. used a vice grip and 1/4' turns. don't forget once you get it loose, gravity will have oil come out.
 
1 - 8 of 8 Posts
Top