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CRAZY RPMS

Discussion in 'General Jeep Discussion' started by JeepMafiaMama, Jul 8, 2017.

  1. Jul 8, 2017 at 3:55 PM
    #1
    JeepMafiaMama

    JeepMafiaMama [OP] Well-Known Member

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    Lisa
    Central ny
    Vehicle:
    98' grand cherokee,88 wrangler
    Lately jeep has been acting weird (the 98 grand cherokee). Sometimes when I'm driving it starts spitting n sputtering kinda bucking n my rpm needle just bounces like crazy! Sometimes she stalls out completely but always starts back up n gets me home. Never thrown the check engine light till now tho. Tried changing out the computer and that worked for a bit. It did leave me stranded once after I took it to an automated car wash that sprays the under carriage... computer change on side of road n she started back up! Fun,fun.it just seems to be getting worse n now it revs like I'm stomping on it too in the middle of all the chaos. Iz not tho. Of course can't find the code reader in the garage. Any ideas guys?...was just trying to take my dog swimming now he's all sad!! :(
     
  2. Jul 8, 2017 at 5:04 PM
    #2
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine Moderator

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    Most times when you get a crazy RPM surge like that, its due to in metered air getting around the throttle body. Check vacuum lines, and intake connections.
     
    JKBob 25 likes this.
  3. Jul 8, 2017 at 6:08 PM
    #3
    JKBob 25

    JKBob 25 Well-Known Member

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    Jersey Shore, NJ
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    2016 JK Wrangler Sport
    2" Superlift kit. 315/ 70/17.
    What Chris said. When I had my 2000 XJ, a vacuum line would blow off due to old age. And my RPMs would jump all over the place until I plugged it back in. Start there. Good chance it may be the issue.
     
  4. Jul 8, 2017 at 8:26 PM
    #4
    SmittyJeeper

    SmittyJeeper Well-Known Member

    Joined:
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    06 wrangler 4.0 6speed
    5" lift, 4.11 gears, tru-trac limited-slips, winch, bumbers... you know the rest.
    See what the code is and go from there... if I had to make an educated guess I would say the crankshaft sensor is on its way out. Super common
     
    chris4x4 likes this.
  5. Jul 14, 2017 at 7:10 AM
    #5
    JeepMafiaMama

    JeepMafiaMama [OP] Well-Known Member

    Joined:
    Nov 2, 2016
    Member:
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    Messages:
    124
    Gender:
    Female
    First Name:
    Lisa
    Central ny
    Vehicle:
    98' grand cherokee,88 wrangler
    Yupper that was the exact code..the guy said it would be a pain in the ass to get to tho :( faulty jeep is a bigger pain in my as tho!! YOU NAILED IT SMITTYJEEPER!! Thanks for the input boys
     
    chris4x4 likes this.
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