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Oil Pump going bad?

This is a discussion on Oil Pump going bad? within the Internal Engine forums, part of the LSx Technical Help Section category; I am in the military and all my life have lived in Illinois I now live in Southern California where ...

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    Senior Member clg82's Avatar
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    Oil Pump going bad?

    I am in the military and all my life have lived in Illinois I now live in Southern California where they get hotter temp's then illinois. My question is when I lived in illinois my oil pressure gauge would consistently read 40-60. Normal right? Now that I live in southern california it is reading a little above 20 and sometime "Bobbing" between 20-40. I haven't changed the type of oil I use so what could be the problem?....I run penzoil 5w30 by the way. Is my oil pump going bad? Or is it just the heat and should I change oils?

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    If you are down around 20 PSI, thats a strong sign your pump is dying and I would stop driving it until you find out exactly what it is and fix it. Otherwise, you are potentially looking at a spun bearing/blown motor pretty soon.
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    Could it not be the sending unit for your oil pressure gauge? I had one go bad in my old 87 IROC and the oil pressure was really low around 10-15. I put a new sending unit or sensor in for like 10 bucks and the pressure went up to 50psi!!! Might be worth a try.

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    Senior Member clg82's Avatar
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    Quote Originally Posted by DEADBYDAWN View Post
    Could it not be the sending unit for your oil pressure gauge? I had one go bad in my old 87 IROC and the oil pressure was really low around 10-15. I put a new sending unit or sensor in for like 10 bucks and the pressure went up to 50psi!!! Might be worth a try.
    where is the sending unit located? I have a 2000 trans am if that helps any.

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    Senior Member clg82's Avatar
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    Quote Originally Posted by Y2KPewterSS View Post
    If you are down around 20 PSI, thats a strong sign your pump is dying and I would stop driving it until you find out exactly what it is and fix it. Otherwise, you are potentially looking at a spun bearing/blown motor pretty soon.
    how much does a new one cost and can I replace it myself?

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    I have to dig out my service manual so it my take a little while but I will find out for ya. I have a z28 but it should be the same as your car.

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    Go on gmpartsdirect.com and look it up. Yes you can replace it. It basically plugs in-nothing to it.

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    Senior Member clg82's Avatar
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    cool thanks man, also if this helps any when i start my car in the morning it reads normal but after it get's hot and it's been running awhile around town, that is when it starts to read low.
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    The sending unit is behind the intake manifold, its a little bit of work but can be replaced.

    I don't know what your mechanical level is, but the pump itself takes some work to access.

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    Thats because the oil gets hot and thinner which causes the pressure to drop down a bit(normal). I cant gaurantee the oil pressure sending unit is your problem but my old car did the same thing. I actually bought the car really cheap because the guy thought the oil pump was bad but it wasnt-it was just the sending unit.LOL

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    I would definately buy one and try it before replacing the oil pump

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    Quote Originally Posted by DEADBYDAWN View Post
    I would definately buy one and try it before replacing the oil pump
    I second this idea, its definately worth a try. I would still keep the driving of the car to a bare minimum until the problem is diagnosed and fixed though.

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    I agree-just in case its not the sending unit.

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    Senior Member clg82's Avatar
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    Quote Originally Posted by Y2KPewterSS View Post
    The sending unit is behind the intake manifold, its a little bit of work but can be replaced.

    I don't know what your mechanical level is, but the pump itself takes some work to access.
    any pix of where the sending unit is exactly? so i can try that tomorrow and if that doesn't work then i will just take it to a shop so they can try and fix the pump itself

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    Quote Originally Posted by clg82 View Post
    any pix of where the sending unit is exactly? so i can try that tomorrow and if that doesn't work then i will just take it to a shop so they can try and fix the pump itself
    I would highly advise not jumping the gun and going to a shop and asking them what is wrong. If anything buy the sending unit and take the part to a shop and get it put on (shouldnt be more than $25.00 labor) if you think you cant handle it. See if the local NAPA parts store has the part. After you get that fixed I would change to 10-40 weight oil since its very hot there. I live in Florida and use 10-40. It will help raise the oil pressure a bit as well.

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    Senior Member clg82's Avatar
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    Ok I will probably do that tomorrow. But I heard that 10w40 is extremly thick for our cars and that it reduces horsepower is that true?

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    No man 20/50 is kinda thick 10/40 isnt but a tiny bit thicker than what u are using. You wont loose any HP. If anything your engine will last longer. I ran 20/50 in my 86 s-10 truck and got 300,000 miles out of it.And I was 17 years old and drove like a idiot. LOL I wouldnt go with 20/50 in your car its a bit thick but 10/40 is perfect. I think 5/30 is way too thin. Good luck with your car I believe its the oil pressure sending unit. Did you find out the price on it? It should be 10-15 bucks

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    also-how long are you going between oil changes?? you should change oil every 3,000 miles

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    Quote Originally Posted by DEADBYDAWN View Post
    also-how long are you going between oil changes?? you should change oil every 3,000 miles
    Of course I change it every three thousand miles silly!! I actually am about to go get the sending unit. So I will let you know how everything turns out when I get it done. And I think I am gonna get an oil change with some thicker oil also. I will let you know and thanks for all of your help.

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    No problem-I sure hope its an easy fix for you. The people here have helped me so many times. I think this site is so awsome. First place I go online every day. Good Luck!!

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