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GDI engine sticking valves?

Discussion in 'General' started by L8RSK8R, May 14, 2022.

  1. Phl218

    Phl218 .


    the blue one.

    he said he didn't need much media at all.
     
  2. Used2befast

    Used2befast Well-Known Member

    Is #8 cylinder the closest to the throttle body?

    If so, the other cylinders are gonna flow differently especially with hyundai pcv system. The 5.0 might just be more prone to gunk up the fwd cylinders. A lot of folks go catch cans on these GDI engines for this reason.
     
  3. L8RSK8R

    L8RSK8R Well-Known Member

    #8 is farthest from the TB.
     
  4. Boman Forklift

    Boman Forklift Well-Known Member

    Not trying to create more issues, but sometimes an extremely clean cylinder is that way from a slight water leak into the cylinder?

    Easiest way to check for that is with a coolant pressure checker. You could often borrow them from an auto parts store.
     
    L8RSK8R likes this.
  5. Used2befast

    Used2befast Well-Known Member

    Thats very true....could be why it was sold to the lowest bidder
     
  6. L8RSK8R

    L8RSK8R Well-Known Member

    Stupid question of the day...
    Is it cool to do a compression test with the intake manifold, all plugs removed?

    Fortunately my tester fits but last time I used it was about 10 years ago on my bikes.

    I've never tested a car before.
     
  7. Boman Forklift

    Boman Forklift Well-Known Member

    Yes. Ground out the plugs or if this has coils on each plug I’m not sure but if you can just disconnect the coils that maybe all you need to do
     
  8. Used2befast

    Used2befast Well-Known Member

    Yep, disconnect all coils and normally the other plugs would be installed. 1 at a time and turn the engine over about 3 to 5 seconds
     
  9. L8RSK8R

    L8RSK8R Well-Known Member

    Plugs, coils and intake are all removed.
    Should I install the plugs or just "send it" as is.?

    Thanks for your help guys ;)
     
  10. L8RSK8R

    L8RSK8R Well-Known Member

  11. notbostrom

    notbostrom DaveK broke the interwebs

    There would be a noticable loss of coolant and usually runs hot. He hasn't mentioned anything like that yet
     
  12. Boman Forklift

    Boman Forklift Well-Known Member

    True, but I don’t think he has driven it enough to know. Hopefully it is not coolant related. I’ve seen forklifts with small coolant leaks (burning during combustion) that run for a few days between water fill ups.
     
    notbostrom likes this.
  13. gixxerboy55

    gixxerboy55 Well-Known Member

    Compression looks good.
     
  14. L8RSK8R

    L8RSK8R Well-Known Member

    I don't see any way coolant has access to the intake manifold or upper side of the valves.
    I have driven the several hundred miles, coolant level seems stable.


    I've replaced intakes on 300k+ Town Cars twice as the thermostat housing is built into the manifold and prone to leaking.
    I replaced them with Dorman intakes which apparently are of a better design.
     
    Boman Forklift likes this.
  15. Used2befast

    Used2befast Well-Known Member

    Yep, your compression looks real good. So your gonna replace the MAP sensor, new plugs and coil then run the intake cleaner through?
     
  16. L8RSK8R

    L8RSK8R Well-Known Member

    I goofed around this morning fabbing a block/plate (wood) to attach with the OEM manifold bolts, over each intake.
    I picked up fine walnut shell, hopper and gun to clean out the intake ports with my compressor.
    That only cost me $80 @ HF.

    I'm nervous as fook to attempt this because I don't know exactly when the valves are fully seated. They're so grimy it's hard to see.

    Guess I could scrape the loose/wet oily gunk while simultaneously vacuuming out the particles.

    Or fook it, replace the parts ya mentioned and run the cleaner.
    Remove the manifold after running the car for a while verify the cleaner actually works.

    Removing the manifold is pretty simple. 8 bolts a few vacuum lines and 4 bolts for the throttle plate gizmo.
     
  17. L8RSK8R

    L8RSK8R Well-Known Member

    KIMG0165.JPG KIMG0165.JPG
     
    Phl218 likes this.
  18. Used2befast

    Used2befast Well-Known Member

    Man those things look gunked up. Whatever you decide...walnut or cleaner make sure you change the oil immediately afterwards :confused:
     
  19. notbostrom

    notbostrom DaveK broke the interwebs

    And replace the pcv and flush that system out.
     
    L8RSK8R likes this.
  20. ChemGuy

    ChemGuy Harden The F%@# Up!

    and add a catch can.
     

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