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Thread: Cuts out after WOT (Paxton equipped)

  1. #1
    Join Date
    Mar 2020
    Location
    Fountain, CO
    Posts
    17

    Cuts out after WOT (Paxton equipped)

    Intermittently my car sort of cuts out almost like itís dropping cylinders after I get on it hard. It also wants to surge at idle during deceleration. I have an 03 with a cobra engine and a Paxton Novi. Itís pushing a little over 630hp. It was tuned by Mo. previous to this issue or would act up and completely die. Itís had the coils recently change with a new MSD set. it doesnít die anymore (yet) but acts up how it did before when it used to die. Any ideas ?

  2. #2
    Join Date
    Mar 2020
    Location
    Fountain, CO
    Posts
    17
    No codes when I scan with my SCT

  3. #3
    Join Date
    Oct 2004
    Location
    Cape Cod, MA
    Age
    66
    Posts
    2,583
    Possible vacuum leak.
    2004 marauder black purchased new. Sold 9/16 at 297,000 miles. Still ran strong didn't burn a drop of oil.
    2003 marauder black 28,000 miles all stock. Garage Queen.
    2004 marauder red daily driver.

  4. #4
    Join Date
    Jun 2008
    Location
    Waukesha, WI
    Posts
    1,566
    Yes, vacuum leak. The diaphragm in you bypass/blow off valve is ripped or torn. You can either replace the diaphragm or replace the entire valve assembly.
    You "feel" the difference because you want to "feel" the difference. Since you just spent money on the upgrade you "have" to feel the difference

    I'm looking to eliminate the double pump process I have to follow right now to get the pedal hard

    2004 300A Procharger #0010 D1X
    2003 300A Procharger #0017 D1SC (SOLD. Last I heard, it was in Washington State)

  5. #5
    Join Date
    Mar 2020
    Location
    Fountain, CO
    Posts
    17
    Thanks for the leads gentlemen. I did find a few significant vacuum leaks for the Bov hoses. I’m from 12 to 20 inches at idle.. hopefully this is my fix. Will test tomorrow.. don’t want to piss off the neighbors. The bov diaphragms were good but I’m glad I took them apart because they really needed a cleaning.

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