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6 Mpg On Stock Blazer

Discussion in 'The Garage' started by Guss, Sep 4, 2005.

  1. Guss

    Guss Registered Member

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    I Did A Tune Up, Oil/filter Change W/ Mobile 1 And Still Only Getting 6 Mpg Help!!
     
  2. BrianDamage

    BrianDamage 1/2 ton status

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    stock size tires ?
     
  3. Guss

    Guss Registered Member

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    31x10.5
     
  4. gmcjimmy90

    gmcjimmy90 Registered Member

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    what year,motor, trans ,gears ,tires.
     
  5. sled_dog

    sled_dog 1 ton status

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    egg or large block of wood under the pedal. My 84 only got about 6mpg.

    If carbed did you rebuild or have the carb rebuilt? Don't expect miracles, it will likely jump to a massive 10mpg if there IS something wrong.
     
  6. Guss

    Guss Registered Member

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    tbi 350. 700R4, w/ 3.73 gears shold be alot beter than 6 im realy scratching my head. it doesnt miss or anything just sucks alot more gas than it should
    and to the egg thing i drive it like a grandma anyway.
     
  7. PsychoticDeadGuy

    PsychoticDeadGuy 1/2 ton status

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    running way rich or is that how much gas the engine likes? also try the O2 sensor. wont help alot but maybe a little.
     
  8. gmcjimmy90

    gmcjimmy90 Registered Member

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    try changing the fuel filter i have 165000 on my 90 gmc jimmy, and it gets about 15mpg
     
  9. muddybuddy

    muddybuddy 3/4 ton status

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    do u have full exhuast on it? when i jus had a y pipe on, i was only gettin 4mpg. other than that i dunno what to tell you :confused:
     
  10. beater_k20

    beater_k20 Banned

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    check your timing, and fuel pressure. also, start driving like a normal person.
     
  11. JEBSR

    JEBSR 1/2 ton status

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    If non of the above works have a scanner put on it and check the coolant temp sensor. If it is telling the computer that the engine is still cold when it is warm then it will run full rich (just like a choke on a carb staying on).
     
  12. Guss

    Guss Registered Member

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    would dirty/leaky injectors do the same thing?
     
  13. gmcjimmy90

    gmcjimmy90 Registered Member

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    yes it could also have the cat checked
     
  14. Guss

    Guss Registered Member

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    recently put exaust on w/ cat but did notice injectors had partial spray with some..... not quite a drip but not a fine spray also looks like the injector seals
    might be leaking. do they make a rebuild kit for the throttle bodie
     
  15. JEBSR

    JEBSR 1/2 ton status

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    The good thing about tbi is you can turn the key on and let the fuel pump cycle and watch the injectors. If they are that bad you can see them leak down. If it is a slow leak use a pressure gauge and see if the pressure leaks down.

    Yes you should be able to get a rebuild kit from any local parts store.
     
  16. blackblazer717

    blackblazer717 1/2 ton status

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    thats funny, last fall my K-5 was having similar problems with fuel milage but turns out to be a faulty wire in the system, i bypassed the fuel pump relay completely, and now when i turn the key on the fuel pump does not cycle it stays on all the time :crazy: :crazy: :crazy: hehehehe. i like it, i get almost 20 MPG with 38.5 swampers on it.!

    LUKE
     
  17. HarryH3

    HarryH3 1 ton status Author

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    The throttle body repair kit will only set you back about $30-35, depending on which throttle body you have. Remove the air cleaner and look closely at the front left edge of the throttle body housing. You need that 8 digit number when you go to buy the kit, to make sure that you get the right one. GM used a LOT of different throttle bodies!
     
  18. Guss

    Guss Registered Member

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    thanks guys. 20mpg on 38s wtf how is that possible
     
  19. Thunder

    Thunder 3/4 ton status

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    Before you do anything check for trouble codes. Even better buy a Scanner! Like an auto X ray or something.
    One of your sensors may be bad and the ECM is in limp home mode. That will usually cause a very rich condition and lousy fuel milage.
    You should be getting way better than 6 MPG with TBI 700r4.
    I get 18 MPG highway on 33 MTs 3.73 gears in an 89 TBI
     
  20. gmcjimmy90

    gmcjimmy90 Registered Member

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    sorry to hijack but what if any mods do you have to get 18mpg's
     

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