Question about 1991 Ford Ranger Supercab
My 91 ranger with a 4.0 failed the e-test badly in the nox section, it has a new exahaust sysystem including the cat, after the test i changed the plugs that were very bad and air filter that was also dirty, new wires were installed and i actually found two vaccum leaks, the tune up was done after the e-test! i also cleaned the maf, anymore suggestions?
If it was the Nox section, check the EGR valve. It that fails, your Nox will go way up. The EGR reduces Nox at cruise speed
Posted on Jun 08, 2009
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Posted on Jan 02, 2017
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