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Replacing EGR Doubled my gas milage???

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Corey-88K5, Feb 27, 2001.

  1. Corey-88K5

    Corey-88K5 1/2 ton status

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    Home: Michigan, Stationed: Hill AFB (Home of Moab.
    My 88 K5 has been throwing codes when driving down the hwy. Before taking a trip to GA, I replaced the EGR & The vac. seloniod and I got over 400 miles on a single tank. The most I've ever gotten was 200-300 miles on the highway. The old EGR was carbon'd up very badly. It had large chunks of carbon and I doubt it was working. Anybody have any thought on this? Also, now the truck idles at 1000 rpm's, I did unplug the idle seloniod, but the chilton manual is a pain in the ass. ANy body have any suggestions?

    Corey
    88K5

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  2. muddin4fun

    muddin4fun 3/4 ton status

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    Get a Haynes manuel. They're much better

    [​IMG] Keep your feet dry [​IMG]
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  3. SuperUnknown

    SuperUnknown 1/2 ton status

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    Sorry for the stupid question, but what is an EGR. There have been a few posts about them lately and I'm in the dark.
    I also have an 88 and doubled gass milage is sounding good to me. Thanks.

    [​IMG]
     
  4. 89K5

    89K5 1/2 ton status

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    I replaced my EGR and O2 sensor the same day - no change in gas mileage.
     
  5. Kyle89K5

    Kyle89K5 1/2 ton status

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    A bad EGR valve could (will) result in a rich mixture. This may be where some of the extra gas was going. A bad O2 sensor will [censored] you up too. My 89 gets better than 15 MPG, or at least it used to. Not so much anymore with a rear axle.

    Kyle
    89K5
     
  6. Corey-88K5

    Corey-88K5 1/2 ton status

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    The EGR is an Exhaust Gas Recurlator Valve. It takes exhaust gases and reintroduces them back into the intake. It helps to reduce emissions, and burn unspent fuel.

    Corey
    88K5

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  7. Waxer

    Waxer 1/2 ton status Author

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    Petty I know, but just wanted to correct this...
    EGR = Exhaust Gas Recirculator

    :)
     

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