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Thread: HELP! Stock 04 PT Turbo Overboosting to 20psi after CAI and Boost gauge install HELP!

  1. #1
    Mitsu booster
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    Arizona
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    HELP! Stock 04 PT Turbo Overboosting to 20psi after CAI and Boost gauge install HELP!

    Ok guys, first time posting on a forum. Im throwing in the towel after 3 days of googling PT CRUSIER OVERBOOST and getting nothing. This started of the other day as an unmolested 103k mile Limited PT Dream Cruiser with the 2.4L Turbo and ATX. After adding a CAI and a Boost Gauge now when i drive there is a very noticeable whistle from the intake and it makes a flutter/woosh sound on decel just like a BOV. Thats all cool... whats not cool is when i go 3/4s throttle and i spike to 18psi-20psi or 21psi at WOT then cuts engine power for overboost. soo... What did i do? What vacuum/boost lines could cause overboost like that? I have visually gone over all lines and did not see anything disconnected. Im thinking maybe a crack? Please help im new to PTs and Turbos and im going crazy over here lol.

    What parts I used for my CAI
    From the Filter to
    http://www.autozone.com/intake-syste...it/245770_0_0/
    Then in to
    http://www.autozone.com/intake-syste...ube/61998_0_0/
    then the turbo...

    Any thoughts?

  2. #2
    Slugmobile & MeanMini Caretaker Turbo Mopar Contributor wheming's Avatar
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    Re: HELP! Stock 04 PT Turbo Overboosting to 20psi after CAI and Boost gauge install H

    I have a pt gt but I haven't experienced what you have.
    But I would first check the line to the wastegate actuator. Test it to make sure it is working.
    You might have damaged it when doing the CAI install.
    Wayne H.

    '91 Dodge Spirit ES 2.5L turbo 5spd
    '05 PT GT 2.4T HO autostick (RIP)
    '89 Plymouth Acclaim 2.5L turbo auto, "Slugmobile" yes, THE Slugmobile!
    '89 Dodge Caravan SE 2.5L turbo auto, "Mean Mini" yes, Gus' Mean Mini! (Current best 11.699 @ 114.43 mph! - Oct 15th, 2022 Cecil County Dragway, MD)
    MeanMini dragracing videos: https://www.youtube.com/playlist?lis...URZLB1RxGYF6vw
    and other cars, trucks and motorcycles
    https://www.youtube.com/user/SlugmobileMeanMini

  3. #3
    Super Moderator Turbo Mopar Staff contraption22's Avatar
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    Re: HELP! Stock 04 PT Turbo Overboosting to 20psi after CAI and Boost gauge install H

    As Wayne says, you likely popped off or cracked a vacuum line while installing your intake system.

    A side note, these cars really don't react well to intake upgrades before the turbo, and the factory air box does a nice job of pulling air out from outside the engine compartment.
    Mike Marra
    1986 Plymouth Horizon GLMF "The Contraption" < entertaining sponsorship offers
    Project Log:
    http://www.turbo-mopar.com/forums/showthread.php?69708-The-Contraption-2013-14&highlight=

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