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93 ZJ 5.2L Compression Test

Discussion in 'Grand Cherokee' started by TinyInkognegroT, Jun 25, 2019.

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  1. Jun 25, 2019 at 7:20 PM
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    TinyInkognegroT

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    TinyInkognegroT [OP] Well-Known Member

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    Did a compression test today on all 8 cylinders with a compression kit some guy brought to do his engine in my complex... Here are the results

    received_699382393850069.jpg
     
    TinyInkognegroT, Jun 25, 2019
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  2. Jun 25, 2019 at 7:28 PM
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    aggrex

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    aggrex Well-Known Member

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    Tuffy>AEV>TTO>JW>STech>EVOcage>MagnaFlow>SpiderTrax>RockHard>TF>SpringTail>67design>Bolt>GPCA>Curt>
    Cylinder #4 looks interesting.
     
    aggrex, Jun 25, 2019
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  3. Jun 25, 2019 at 7:31 PM
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    TinyInkognegroT

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    TinyInkognegroT [OP] Well-Known Member

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    Just cylinder 4 ?
     
    TinyInkognegroT, Jun 25, 2019
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  4. Jun 25, 2019 at 7:31 PM
    #4
    TinyInkognegroT

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    TinyInkognegroT [OP] Well-Known Member

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    I don't even know the firing order or the wiring...
     
    TinyInkognegroT, Jun 25, 2019
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  5. Jun 25, 2019 at 7:35 PM
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    aggrex

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    aggrex Well-Known Member

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    Tuffy>AEV>TTO>JW>STech>EVOcage>MagnaFlow>SpiderTrax>RockHard>TF>SpringTail>67design>Bolt>GPCA>Curt>
    hqdefault.jpg
     
    aggrex, Jun 25, 2019
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  6. Jun 25, 2019 at 7:46 PM
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    TinyInkognegroT

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    TinyInkognegroT [OP] Well-Known Member

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    Yes cylinder 4 is interesting. These results were after 7 turnovers each. What is the right pressure for these cylinders ?
     
    TinyInkognegroT, Jun 25, 2019
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  7. Jun 25, 2019 at 8:29 PM
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    aggrex

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    aggrex Well-Known Member

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    For the age of the motor I think the psi are on target....except the one
     
    aggrex, Jun 25, 2019
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  8. Jun 25, 2019 at 8:49 PM
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    TinyInkognegroT

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    TinyInkognegroT [OP] Well-Known Member

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    What are some causes of this ?
     
    TinyInkognegroT, Jun 25, 2019
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  9. Jun 26, 2019 at 3:54 AM
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    aggrex

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    aggrex Well-Known Member

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    The causes can vary: been that way, high mileage, negligence, etc.
     
    aggrex, Jun 26, 2019
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  10. Jun 26, 2019 at 6:17 AM
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    TinyInkognegroT

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    TinyInkognegroT [OP] Well-Known Member

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    Is it something I should worry about ? How can I fix it ?
     
    TinyInkognegroT, Jun 26, 2019
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  11. Jun 26, 2019 at 6:22 AM
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    Awrench

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    Awrench Well-Known Member

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    IDEALLY a compression leak down - yeah I am spoiled with a shop and all the gizmos.
    With #4 on compression - both valves closed - compressed air (shop air) is fed into cylinder thru plug hole - listening to where air leaks out (intake, exhaust, crankcase) helps locate the issue.

    just #4 being low, Is there any evidence of water/coolant in oil?
    > I would do a wet compression test - adding @ a teaspoon of oil thru spark plug hole and retry readings.
    >Confirm both valves are closing, removing valve cover to inspect.
    > You may try adding some combustion chamber cleaner ito plug hole, this would frree a sticking piston ring - then retesting.
     
    Awrench, Jun 26, 2019
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  12. Jun 26, 2019 at 6:35 AM
    #12
    TinyInkognegroT

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    TinyInkognegroT [OP] Well-Known Member

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    My grandpa has a shop but he's almost 40 miles away lol and no water or coolant in the oil. Best I can do as soon as possible is the combustion chamber then go on from there. I have a job interview today, so hopefully I get this job and bring in some tool and repair money
     
    TinyInkognegroT, Jun 26, 2019
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  13. Jun 26, 2019 at 6:36 AM
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    TinyInkognegroT

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    TinyInkognegroT [OP] Well-Known Member

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    Could it be the cause of my "surge" problem I posted earlier ?
     
    TinyInkognegroT, Jun 26, 2019
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  14. Jun 26, 2019 at 7:21 AM
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    Awrench

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    Awrench Well-Known Member

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    good luck today.

    I do not see a surge issue, was it in another post topic?
    Anyway post a NEW topic with any other issues -
     
    Awrench, Jun 26, 2019
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  15. Jun 26, 2019 at 8:00 AM
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    TinyInkognegroT

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    TinyInkognegroT [OP] Well-Known Member

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    Thank u ! Yea its another topic I posted
     
    TinyInkognegroT, Jun 26, 2019
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  16. Jun 26, 2019 at 11:11 AM
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    TinyInkognegroT

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    TinyInkognegroT [OP] Well-Known Member

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    On this diagram, is coil in the middle of the cap ? From #1 on the cap, does it go by number order or by firing order ?
     
    TinyInkognegroT, Jun 26, 2019
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  17. Jun 27, 2019 at 5:46 PM
    #17
    TinyInkognegroT

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    TinyInkognegroT [OP] Well-Known Member

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    Read online the best combustion chamber cleaner is distilled water from a spray bottle...in case chamber 4 is sticking
     
    TinyInkognegroT, Jun 27, 2019
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  18. Jun 27, 2019 at 5:49 PM
    #18
    TinyInkognegroT

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    TinyInkognegroT [OP] Well-Known Member

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    Screenshot_20190627-194852.jpg
     
    TinyInkognegroT, Jun 27, 2019
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  19. Jun 28, 2019 at 6:34 AM
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    aggrex

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    aggrex Well-Known Member

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    I'm not convinced this is effective and if done improperly connecting rods can hurt your ankles.
     
    aggrex, Jun 28, 2019
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  20. Jun 28, 2019 at 6:39 AM
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    TinyInkognegroT

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    TinyInkognegroT [OP] Well-Known Member

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    What do you mean by this ?
     
    TinyInkognegroT, Jun 28, 2019
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