Question about Chevrolet TrailBlazer

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"low oil pressure" and "stop engine" on msg center. burning oil and sometimes over heating. randome overheat... but has ran a little hot from the time the oil pressure msg came on. threw 2 codes O2 and over heat. didn't write the code #'s down sorry. just did an oil change w/ filter and added 6 qts. as recomended for the 5.3L v8. the dip stick is saying overfilled even when it's running and there is a wine that changes with RPM's. thus leads me to beleve it's the oil pump... so where is it? a diagram or walkthrough would be great. it"s a friends car I'm just the unlucky guy saveing hem some money. thanks Jeremie

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  • jeremie
    jeremie Aug 05, 2010

    two heads are better than one...

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  • 382 Answers

Will have to take the oil pan down, is inside the oil pan. depending on the way the pan sits on the cross member, you may have to take the motor loose from the mounts and jack it up to remove the pan. if u have the 4.2 engine, the oil pump is located under the timing chain cover located on the front of the engine and u have to remove the oil pan in order to remove the cover. This is a big deal (even for dealers mechanics)

Posted on Aug 05, 2010

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Diagrams are not available as free downloads.Sometimes local libraries will carry a haynes or chilton manual to check out.National auto parts stores carry them.Sometimes I go there to just look for my situation,they frown on that.If you want to buy one,they are about $20-$25.You can also call a dealer or a couple of shops,someone is usually willing to tell you for free because they want your business.You check transmission fluid with the engine running,after about 5 minutes of warmup.Now to the problem.For overfilling oil,you should not go too far past the recommended full line.It is bad for the gaskets and you may end up burning oil.Checking the oil with the engine running probably will result in a high reading because it is being cycled.As for the oil pump,most seem to be external to the engine.Some I think are internal.The easiest way to figure out where your pump is,follow the hose coming out somewhere near the bottom of the oil pan.The hose will be somewhat wide,one inch or more and will lead to the pump,where it goes in somewhere about mid high to the top of the engine.O2 did you mean oxygen sensor?If you are getting that code,I would at least have it checked out if not replaced.Low oil pressure is a sign of a bad oil pump,it will overheat,and should be avoided driving very far,if at all.the whine with RPM change,is there a specific time that it happens?For example,when it's about to shift,randomly,car hot or cold?If you can please answer that for me,it may offer more information,such as transmission.I would very much like to know that because if it is transmission,there may be no point to fixing the rest,depending on money,necessity or whatever if you know what I mean.Good luck and I hope to hear good news about that whining sound!

Posted on Aug 05, 2010

  • 8 more comments 
  • jeremie
    jeremie Aug 05, 2010

    oil wasn't over filled 6 qts for the 5.3 v8 is the recomended amount...
    level reads high even when cool on level ground. my thinking was if the oil pump is the issue than it wouldn't be pumping oil thus no oil would be held in the filter/head so a high reading would be somewhat understood...
    oxygen sensor is an issue but a seperate one...
    the whine is notticeable coold/ hot in gear and in nuteral. the transmission was rebuilt less than 10k miles ago so i doubt that is the problem. and the fact that it will still whine in nuteral means it's an enging whine not a transmission whine.
    how do you test an oil pump without a mech. gauge tester?
    was told by a shop it might be the wrong oil filter causing this.... but the low oil pressure msg showed up before the oil change... so i doubt that's the problem but wil swing by the dealership today to pick up a new one regardless.
    and there are diagrams all over the internet i just can't find the one specific to this vehicle/problem
    thanks for the help,
    Jeremie

  • Greg McCarthy Aug 05, 2010

    Oil pumps don't usually fail 100%.I don't know why but they don't.Unfortunately,if there is no pressure guage on the dashboard,it has to be checked mechanically,digitally,whatever it takes.Normal pressure is usually around 60 psi.A bad oil pump will still usually put out about 20 psi.As for the whining,all I can say is just start the car,open the hood,and listen and try to pinpoint the area if you already haven't.You sound like a good friend to have Jeremie since your friend doesn't either know much mechanically,or does know and is just unable to do it due to some physical ailment.Good luck and let me know how you make out!Greg

  • Greg McCarthy Aug 05, 2010

    ...or for whatever the reason may be.I just thought of something.Would you please send me a couple links to where you were able to find repair manuals or parts diagrams or whatever you found.1 or 2 would be greatly appreciated.If there is one that lists all brands that is fine but I would like to find that info for future refernces.It would make things a little easier.Thanks,Greg

  • jeremie
    jeremie Aug 05, 2010

    google image search will pull up a lot. i found one that is for the 5.3 L v8 in a silverado... but unsure if it's the same power plant as the 5.3L v8 trailblazer... i'm an ASE cert. tech and he only thinks he has a clue so... ya... go me!!!!

  • jeremie
    jeremie Aug 05, 2010

    google image search will pull up a lot. i found one that is for the 5.3 L v8 in a silverado... but unsure if it's the same power plant as the 5.3L v8 trailblazer... i'm an ASE cert. tech and he only thinks he has a clue so... ya... go me!!!! I have the link saved on my laptop will post it as soon as i can. Jeremie

  • jeremie
    jeremie Aug 05, 2010

    google image search will pull up a lot. i found one that is for the 5.3 L v8 in a silverado... but unsure if it's the same power plant as the 5.3L v8 trailblazer... i'm an ASE cert. tech and he only thinks he has a clue so... ya... go me!!!! I have the link saved on my laptop will post it as soon as i can. Jeremie

  • jeremie
    jeremie Aug 05, 2010

    google image search will pull up a lot. i found one that is for the 5.3 L v8 in a silverado... but unsure if it's the same power plant as the 5.3L v8 trailblazer... i'm an ASE cert. tech and he only thinks he has a clue so... ya... go me!!!! I have the link saved on my laptop will post it as soon as i can. Jeremie

  • jeremie
    jeremie Aug 05, 2010

    google image search will pull up a lot. i found one that is for the 5.3 L v8 in a silverado... but unsure if it's the same power plant as the 5.3L v8 trailblazer... i'm an ASE cert. tech and he only thinks he has a clue so... ya... go me!!!! I have the link saved on my laptop will post it as soon as i can. Jeremie

  • jeremie
    jeremie Aug 05, 2010

    google image search will pull up a lot. i found one that is for the 5.3 L v8 in a silverado... but unsure if it's the same power plant as the 5.3L v8 trailblazer... i'm an ASE cert. tech and he only thinks he has a clue so... ya... go me!!!! I have the link saved on my laptop will post it as soon as i can. Jeremie

  • Greg McCarthy Aug 06, 2010

    Aren't those both Chevies?You would they would be the same but ya never know.Thnx and good luck!Google images huh?Sounds good.

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