Question about 1990 Isuzu Trooper

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Fuel consumption 1991 trooper 2.8l

I just had a new motor installed there is 400 miles on it now the motor runs great has expected power. But it is only getting 8.24 mi. per gal of gas I put a new TBI on it and that didn't do any good other that making my wallet lighter.

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  • yadayada
    yadayada May 11, 2010

    let it break in for at least 1000 miles

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Yes, GENTLY break the motor in to about 1k miles after that, change the oil/filters and you will slowly see an increase in your mpg. I had the same problem with mine. Now has 60k on new motor and I get a consistent 20mpg on the hwy. City mileage is about 12.

Posted on Mar 06, 2009

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