Low Compression Help and Possible Fix - ACDelco X66P

Discussion in 'MZR Knowledgebase' started by JohnnyTightlips, Mar 7, 2019.

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  1. JohnnyTightlips

    JohnnyTightlips Gold Member

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    This has helped a few cars in the past with low compression to free up rings that have carbon build up.

    1. Get the car hot then let take out the plugs.
    2. Pour 4oz into each cylinder
    3. Let it sit overnight or a day or two.
    4. Suck out the fluid from each cyl.
    5. Change your oil as it will seep into it, do some cheapo oil.
    6. Drive the car for 50ish mile with decent revving and engine braking, similar to a motor break in.
    7. Change the oil to the good stuff and then check compression when you get a chance.

    ACDelco X66P Fuel Injector and Upper Engine Cleaner - 16 oz
     
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  2. KingScumbag

    KingScumbag Gold Member

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    The 6 cylinder Engine restore crap from "restore" has always worked well to get some final life out of people's engines. Specifically the 6 cylinder version. Although I'd never condone or recommend any of this crap, I've seen it work as a "bandaid" many times.
     
    KingScumbag, via a mobile device, Mar 8, 2019
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  3. Sho

    Sho Silver Member

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    Is there an alternative to that ac Delco x66p that isn't discontinued and doesn't cost $100+ on ebay to get ahold of?
     
    Sho, via a mobile device, Mar 26, 2019
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  4. Eroler1

    Eroler1 Greenie Member

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  5. AboveAverageJoe.

    AboveAverageJoe. Silver Member

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  6. Nliiitend1

    Nliiitend1 aka "Nintendo" Greenie Member

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    I'm in the midst of doing this right now. Trying to restore low compression/resolve a nasty misfire in cylinder 2...

    Cylinder 2 was at about 90 psi while the rest were ~180 psi.

    Fingers crossed!
     
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