Question about 1991 Isuzu Trooper

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Fuel mileage i bought this trooper w/149k mi. put new head gasket, main bearings, rings,clutch, and sensors. i only get 15 mpg hwy.Every thing i can think of has been done. even diagnostics, which says every thing is ok. It's got a 2.6 liter w/4drs. however i noticed yesterday that the large canister the vacuum lines attatch to on the pass.side has no hose attatched to the bottom of it. why, if everything shows correct, is my mileage so bad.

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  • missionaries Aug 26, 2008

    i was thinking about that today. my wheels make a low pitch howl when i start to back up. i just thought it might be dust. my emergency might be to tight or maybe grease is needed. i'm very grateful. thank you.



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Agreed: in this case the dragging brake will kill your mileage like it did mine before i smelled something hot. I was down to 10mpg. It also goofs up your rwd traction in snow. Replace or renovate the caliper and you should be good. ebay has slotted rotors and ceramic pads for a hundred bones and the calipers go for 70 ish each, easily swapped out by yourself.

My 91 was downshifting in city traffic like I was hauling 4000 pounds.

Posted on Dec 21, 2008

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You millage is a little off this truck gets its best millage at 55-60mph and should be around 18
have your looked at the drive system front hubs dragging brakes stock tire size? and sure the front hubs are not turning .

i have worked on more cars this year trying to get better millage then i have in 25 years combined.

Posted on Aug 25, 2008

  • paul erickson
    paul erickson Aug 26, 2008

    sometime people just need a little thought boost .
    i hope your boost works



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