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Thread: 2000 blazer.. too much oil pressure.. help!

  1. #1
    The Louder, The Better Nvr2Loud's Avatar
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    2000 blazer.. too much oil pressure.. help!

    ok so the other day, i started up my truck to drive some friends home, immediately after starting, oil pressure spiked and peaked on the oil gage, then the gasket around my oil filter blew and all my oil shot out. ( didnt know that at that point.) so, after getting it halfway up on a trailer, i crawled underneath the truck and low and behold theres the blown off gasket on the oil filter.

    so i ran to the auto parts store, got my 5 qts and a filter, put the new filter on (hand tight w/ 1/4 turn with a filter wrench.) started the truck up. spiked oil pressure and POOF there goes the oil filter gasket, and my brand new 5 qts of oil again..

    WTF!?!?!

    anyone have any idea's??
    2000 Blazer Xtreme Conversion:bowdown:
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  2. #2
    your all sick with sin
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    try putting less oil in :confused:?

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    LOL really dude? really?





    Umm, first thing id check is maybe in your filter adapter, im trying to think what would cause that, if your bypass messed up that shouldnt make it spike up like that, ill see if i find anything.


    89' S10 blazer 4wd: 355, 650 dp, rpm intake, comp 282 roller cam, modified vortecs, T56 Six speed, 8.8 ls rear, headers, x-pipe, spintech pro street mufflers, and......AC

    Blazer burnout video - http://www.youtube.com/watch?v=sP7iLypoDI4

  4. #4
    Registered User dragnblazer's Avatar
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    Never heard of these trucks doing that
    My project thread 89 bagged 2door
    http://www.blazinlow.com/forum/showthread.php?t=68023

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  5. #5
    Registered User AIR SIC's Avatar
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    Bad PCV valve not opening anymore maybe?

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    Lol too much oil, that's just great.

    Let my think????? Shouldn't be the oil bypass because that provision is put into place so if the filter becomes clogged the engine doesn't become oil starved. So... something is pluging the oil passage after the filter. Engine starts, oil pump spins, makes pressure, oil go's through filter, after filter oil has no where to go, oil pump still pumping, and boom! Oil on the ground. Also could be the pressure regulator spring in the oil pump. That spring and valve could have seized and when you start the motor when it's cold you make super high pressure because the oil is thicker. Please tell me you not running 20w 50 or strait 50w or something.
    " When this baby hits 88 miles per hour..."

  7. #7
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    Not to be rude but what does PCV (positive crank ventilation) have to do with oil pressure. Were not talking oil pan gasket. Once again not to be rude just asking.
    " When this baby hits 88 miles per hour..."

  8. #8
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    it has nothing to do with it, it was another completely wrong answer. But i guess any help is better than none.


    89' S10 blazer 4wd: 355, 650 dp, rpm intake, comp 282 roller cam, modified vortecs, T56 Six speed, 8.8 ls rear, headers, x-pipe, spintech pro street mufflers, and......AC

    Blazer burnout video - http://www.youtube.com/watch?v=sP7iLypoDI4

  9. #9
    LQ4/LS1 Turner's Avatar
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    Quote Originally Posted by skanN86 View Post
    try putting less oil in :confused:?
    :evil: just when ya think youve seen it all..... another good laugh comes along

  10. #10
    LQ4/LS1 Turner's Avatar
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    fairly sure there is a pressure relief valve built into the pump set at 60 psi on 4.3, i could be wrong tho

  11. #11
    Registered User AIR SIC's Avatar
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    Quote Originally Posted by Superbee View Post
    it has nothing to do with it, it was another completely wrong answer. But i guess any help is better than none.
    The PCV vents excess pressure from the crankcase, where most of the oil is, duh. If you have a bad PCV valve that lets pressure build up you can blow out seals and gaskets causing oil leaks. I've seen accounts of it on other engines. Does it not happen on 4.3s and SBCs?

  12. #12
    LQ4/LS1 Turner's Avatar
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    Quote Originally Posted by AIR SIC View Post
    The PCV vents excess pressure from the crankcase, where most of the oil is, duh. If you have a bad PCV valve that lets pressure build up you can blow out seals and gaskets causing oil leaks. I've seen accounts of it on other engines. Does it not happen on 4.3s and SBCs?
    its is 100% impossible for a pcv to blow out a oil filter o ring, your pcv valve would blow through your hood if you had enough crank case pressure to pop a oil filter

  13. #13
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    yeah the crankcase system is the free air in your engine, the OILING SYSTEM is pressureized, it LEADS to the same place, but.....ok thats all i got cant explain any better than that, brain is fried.


    89' S10 blazer 4wd: 355, 650 dp, rpm intake, comp 282 roller cam, modified vortecs, T56 Six speed, 8.8 ls rear, headers, x-pipe, spintech pro street mufflers, and......AC

    Blazer burnout video - http://www.youtube.com/watch?v=sP7iLypoDI4

  14. #14
    Registered User dragnblazer's Avatar
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    Lol chad
    My project thread 89 bagged 2door
    http://www.blazinlow.com/forum/showthread.php?t=68023

    Wife's daily
    2002 chevy blazer 4 door 2wd ls

    My daily
    2000 Gmc jimmy 2 door 5 speed

  15. #15
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    Quote Originally Posted by AIR SIC View Post
    The PCV vents excess pressure from the crankcase, where most of the oil is, duh. If you have a bad PCV valve that lets pressure build up you can blow out seals and gaskets causing oil leaks. I've seen accounts of it on other engines. Does it not happen on 4.3s and SBCs?
    When a PCV valve fails it can cause pressure to build in the crankcase causing oilpan gasket failure, blown valve cover gaskets, and even blown intake manifold gaskets! So you are right in that aspect but, the PCV valve/system has absolutely nothing to do with the oiling system or oil presure. It is just a ventilation system. Just like turning the fan on in the bathroom when you take a shower.

    Most oil filters have a burst pressure of at least 150 to 200 psi so if that type of presure is being sent to the filter. It's hard to say what's causing it. Like I said before, I don't think it's the filter bypass because that's only there so if the filter clogs the engine still gets oil.(not filtered oil but pressurized oil to keep it from burning up). I don't think you have a plugged oil galley because the filter gasket is failing. I say that because it takes alot of pressure to cause a filter gasket or filter to fail. So this leads me to believe that it's the pressure relief spring in the pump it self. I'm not sure of the excat pressure setting but someone else said 60 psi which should be about right. This pressure relief spring is calibrated to let a bypass valve in the pump open when the pressure reaches say 60 psi. An oil pump is very well capable if exceeding that by say a nother 100 psi. This bypass lets the over presurized oil go back into the oil pan and not into the oiling system. Now bear with me. If that valve is seized then all the oil flow and pressure is going directly to it's next stop. The filter. See what I'm getting at. DONT go out and buy a high burst pressure filter cause if your engine has press in oil galley plugs those will be the next thing to go which would suck. Replace the oil pump. The spring and valve are internal so buying a new pump would be the way to go. Stock pumps are like 20 bucks. Proly gonna need a oil pan gasket and a tube of RTV also. Plus new oil and filter your looking at $100.

    And just a thought. I don't know it all but I know more then most when it comes to this stuff. I also know when I can help somebody or when not to help at all because I havn't a clue. We're all here to help and get help but if you don't know what your talking about, dont try cause all your gonna do is send some poor bastard on a wild ride trying to figure out what's wrong with their truck. I'm not saying that buying a new oil pump is a "guaranteed" fix but it's the best place to start. Why? Cause it makes sence. PCV system. Really? That's right up there with the too much oil. Maybe you miss read the problem? Good thought. But if you read the question correctly then you need to learn the limitations of your knowledge.
    Last edited by ToLows10; 04-09-2011 at 10:26 AM.
    " When this baby hits 88 miles per hour..."

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