Question about 1991 Chevrolet S-10
236,000 miles it has a brand new O2 sensor and MAP sensor(other reasons) spark plugs and wires appear fine.Put on sun machine and it's running from Lean to Rich.Was 1.25 before the o2 sensor which failed the test and with the new sensor 1.28 so I'm heading in the wrong direction! Other than that my gas mileage is same as always..running very well with no obvious problems including no vac leaks that could be detected..no codes coming up,air filter is clean...all the obvious has been replaced and or checked.I have 10 days before I have to put a temp tag on it and we are out of ideas.
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Posted on Jan 02, 2017
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