Oil light

Tiny
BRISENOJOEY
  • MEMBER
  • 1997 CHEVROLET CAVALIER
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 276,000 MILES
I have a 97 Chevrolet caviler with a new oil pump and pressure switch, but my oil pressure light comes on at idle.I up graded to 10-40 oil with a Lucas oil aditive, I even tryed a diffrent brand of oil filter too. But it dose the same thing.
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Sunday, November 21st, 2010 AT 5:45 AM

7 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
Is there any ticking or knocking from the engine to indicate the pressure is low?
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Sunday, November 21st, 2010 AT 5:46 AM
Tiny
BRISENOJOEY
  • MEMBER
There is a slight taping from the valve cover but when it's warm the taping stops. The oil light come on when the car is at idle or when I stop at a light only.
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Monday, November 22nd, 2010 AT 1:03 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Chances are that is nothing more than a lifter that is pumping up. Have you ever checked the oil pressure with a mechanical oil gauge? All you do it basically unscrew the present oil sending unit and the mechanical one screws in the same place. By doing that, we can make sure the oil pressure is good and it is an electrical issue rather than still the engine. Please keep in mind, oil pressure is acutally made not by the pump but rather it is based on how much clearance between main bearings. If they are worn (excessively) it doesn't matter how good of a pump you have, the pressure will be low.

Let me know if you would be able to test it that way. Most parts stores will lend or rent the gauge to you.

Joe
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Monday, November 22nd, 2010 AT 1:52 AM
Tiny
BRISENOJOEY
  • MEMBER
Thank you vary much I will try the mechanical gauge first.
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Monday, November 22nd, 2010 AT 5:14 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Let me know what you find.

Joe
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Monday, November 22nd, 2010 AT 4:10 PM
Tiny
BRISENOJOEY
  • MEMBER
I asked a shop next to my job, thay told me the cam and crank bearings can also hold or let go pressure is this true. If this is true thay said the only way to replace the cam bearings is to pull the engine out because there is no room to pull it out in the car since the cam is in the block. One guy said you can change the main bearing with out takeing the crank off is this a simple fix?
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Tuesday, November 23rd, 2010 AT 12:45 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
What he is saying is correct. As far as the crank bearings, it isn't a hard fix, but will take time. The cam is another story. It will be labor intense.

I wouldn't do anything until you check what the oil pressure actually is. A slight tick in the AM until it warms up could go on for years without issue. The oil light could be a simple 20 dollar sending unit. Have them check the oil pressure to be sure it is low. Honestly, for it to be low enough for the light to come on, you should hear more than a sligh AM tick.

You can check it yourself. It is easy, and most nationally recognized parts stores will lend you the gauge. It is nothing more than unscrewing the oil sending unit and screwing the mechanical gauge in. The people at the parts store can show you exactly where it is and how to do it. If the weather is good, they'll lend you the tools and you can do it right in their parking lot. It will take about 15 minutes.

Also, I can help if you have questions.

Let me know.
Joe
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Tuesday, November 23rd, 2010 AT 5:48 AM

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