1. Welcome to Jeeps.net!

    You are currently viewing as a guest! To get full-access, you need to register for a FREE account.

    As a registered member, you’ll be able to:
    • Participate in all Jeep discussion topics
    • Transfer over your build thread from a different forum to this one
    • Communicate privately with other Jeep owners from around the world
    • Post your own photos in our Members Gallery
    • Access all special features of the site

9 mpg normal for the 5.2 zj?

Discussion in 'Grand Cherokee' started by 98zj, Feb 16, 2018.

  1. Feb 16, 2018 at 4:03 AM
    #1
    98zj

    #1
    98zj [OP] New Member

    Joined:
    Feb 16, 2018
    Member:
    #2127
    Messages:
    2
    Gender:
    Male
    First Name:
    Jacob
    Vehicle:
    1998 jeep grand Cherokee 5.2 v8
    3in lift on 31 Hercules trail diggers
    I am new to the forum I have a 98 jeep grand Cherokee with the 5.2L. Does anyone know what would cause me to get about 9 miles a gallon or is that normal for the 318
     
    98zj, Feb 16, 2018
    #1
  2. Feb 16, 2018 at 7:09 AM
    #2
    chris4x4

    #2
    chris4x4 With sufficient thrust, pigs fly just fine Moderator

    Joined:
    Jul 19, 2016
    Member:
    #2
    Messages:
    4,068
    Gender:
    Male
    Welcome to the site! Mpg sounds a bit low. I would start with the basics. Spark plug change, air filter, and clean the throttle body, and mass air sensor.
     
    chris4x4, Feb 16, 2018
    #2
    JKBob 25, aggrex, Bob and 1 other person like this.
  3. Feb 16, 2018 at 8:22 AM
    #3
    aggrex

    #3
    aggrex Well-Known Member

    Joined:
    Sep 12, 2016
    Member:
    #203
    Messages:
    4,912
    DE
    Vehicle:
    Backcountry '16
    Tuffy>AEV>TTO>JW>STech>EVOcage>MagnaFlow>SpiderTrax>RockHard>TF>SpringTail>67design>Bolt>GPCA>Curt>
    Welcome! The 5.2 in the GC makes for a swift SUV that was rated for 14/18 mpg. Some of the GC had full-time 4WD systems but adding to chris4x4 suggestions based on the age checkout any brake drag, tires, alignment etc. Perhaps you're tapping into the 220HP a bit much.
     
    aggrex, Feb 16, 2018
    #3
    JKBob 25, chris4x4 and Bob like this.
  4. Feb 16, 2018 at 10:26 AM
    #4
    Prerunner1982

    #4
    Prerunner1982 Well-Known Member

    Joined:
    Aug 4, 2017
    Member:
    #1745
    Messages:
    1,356
    Gender:
    Male
    First Name:
    Jon
    Vehicle:
    93 XJ 2 door
    Any check engine light?

    A bad Oxygen sensor could cause poor gas mileage.
     
    Prerunner1982, Feb 16, 2018
    #4
    JKBob 25 and aggrex like this.
  5. Feb 18, 2018 at 7:20 PM
    #5
    JKBob 25

    #5
    JKBob 25 Well-Known Member

    Joined:
    Mar 22, 2017
    Member:
    #1197
    Messages:
    3,893
    Gender:
    Male
    First Name:
    Bob
    Jersey Shore, NJ
    Vehicle:
    2016 JK Wrangler Sport
    Welcome to the forum @98zj. Yeah agreed 9 mpg is some what umm, not good.
    A bunch of great advice mentioned above. All I can add. Have you made any drastic changes such as bigger tires? What's your rpms as say 65 mph? At what point rpm wise, is your tranny shifting gears? Just my experiences is why I ask.
    I'm sure we can help you figure this out. You came to the right plave.
     
    JKBob 25, Feb 18, 2018
    #5
Register FREE to Reply!
To Top