Oil leak somewhere?

Discussion in 'Issues, Repairs, Warranty, TSB, Recalls' started by njudd921, May 13, 2020.

  1. njudd921

    njudd921 Well-Known Member

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    I have a 2017 GT Performance pack I bought used, 22k miles. Trying to track down an idle surging problem and started with the basics, new plugs, cleaned MAF. The idle isn't bad, just seems to sit for 10 seconds, bounce the rpm up, drop below idle and then repeat.

    Noticed all 8 spark plug threads are soaked. Took the throttle body off to clean it and the intake manifold is wet too, not drenched, just a covered film basically on the inside.

    Mods are as follows. PMAS cold air intake, Pipes long tube headers with high flow cats, billy boat cat back with x pipe, e85 tuned.

    What am I looking at here? Intake manifold gasket? valve cover gasket? Don't really see any oil externally except around the connection in the picture. Manifold picture is upside down. image0-3.jpeg image0-4.jpeg image1-5.jpeg
     
  2. 15GTPP

    15GTPP Well-Known Member

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    Most likely don’t have a leak. The oil inside the intake is blow by oil. If you don’t have a oil catch can you can look into one and that’s what those help for. Plugs look normal to me but wait for others to chime in.
     
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    njudd921

    njudd921 Well-Known Member

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    Ahhh a catch can, I was planning on getting one just haven’t yet. Good call. I will wait for other input as well. Thanks!
     
  4. Ghost50

    Ghost50 Well-Known Member

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    I agree on the catch can addition. That looks like blow by like @15GTPP mentioned.

    This was my oil catch can dump at my last oil change. That’s about what I get out of it each time I empty it. 435D8747-2149-444B-95A4-39FE7F9BAF87.jpeg
     
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    njudd921

    njudd921 Well-Known Member

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    Thanks, Just ordered the JLT 3.0. Now on to figuring out why this thing is still surging.
     
  6. Cheatham

    Cheatham Member

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    Sounds like a pcv valve issue
     
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    njudd921

    njudd921 Well-Known Member

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    Checked it. Plenty of suction. I’m at a loss. This thing will not sit still when idling. There is about a 100-150 rpm difference. Vacuum gauge, oil pressure gauge, and afr all move when it surges. It isn’t random either, it revs up slightly, then back down, 5 seconds later up, then down. And repeats.
     
  8. GT Pony

    GT Pony Well-Known Member

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    Possible vacuum leak someplace? Check all the hoses going to the intake manifold. Also check the seal on the oil filter cap and dipstick.

    +1 on using a catch-can. I put one on my GT when it had about 300 miles on it.
     
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