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Originally Posted by georgelovesdirt
just went to get my 95 blazer inspected, failed the co emmisions test by 9.5%, official nj co% is 1.43, i got 11.00. its about 3/4 through the first tank after sitting for a year and i also put fuel injector cleaner in, anything i should do before try number two? i figure i was going to wait a tank or two, perhaps use that stuff designed to help you with the test? also im getting about 11-13 miles per gallon is that expected after sitting for so long and with winter gass formula?
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Do you have the 4.3L CPI version?
You're obviously running too rich. I think 11-13 MPG is too low. Any hesitation, hard starting, sputtering, black smoke coming out of the exhaust pipe? As a last resort, Check for bad CPI and Nut Kit. (search this Forum).
Check to make sure your Air Filter is clean. Also, pull the Coil wire off of the Coil (not off of the Distributor) and see if there is corrosion build up on the coil terminal, if so, clean it with a wire brush and re-attach the coil wire. Also, look at the coil wire as it comes out of the rubber boot that attaches to the coil. Is it burnt, brown, or brittle about a 1/2 inch up on the wire? If so, You might replace your wires to make sure your geting good spark. Finally, check for any codes at Auto Zone.