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Thread: 5.3 with excessive crankcase vacuum and sputter

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  1. 06-17-2014 10:05 AM #1
    Ray@NP's Avatar
    Ray@NP
    Ray@NP is offline of course its stock
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    what year 5.3L is it?
    06 rcsb, 6two, 231/235, 4.11, pacesetter, 80e, 14 bolt, Nelson tuned
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  2. 06-17-2014 09:23 PM #2
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    George C
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    what is it in? where are you located?
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  3. 07-07-2014 11:52 PM #3
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    farmtruc
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    Our test engine had excessive vacuum also.
    Pull the pcv hose and block the intake side.
    Fixed.
    Btw the oil cap would be tight and whistle with all that vacuum.
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