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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

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    Jacob
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    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

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    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

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    DE
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    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

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    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

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    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
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