1992 Ford Ranger wont pass smog

1992 FORD RANGER
200,000 MILES • 6 CYL • 4WD • AUTOMATIC
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SHOGOX10
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my ford wont pass smog i pulled up the codes off it
an it cam up with a 171 an i looked it up an it says something a bout a map sensor but i cant find it
Mar 24, 2009 at 4:19 PM
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RASMATAZ
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Which engine do you have 2.9/3.0/4.0L???
Mar 24, 2009 at 4:28 PM
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SHOGOX10
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the 4.0 its also coming up with high CO
Mar 24, 2009 at 4:30 PM
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SHOGOX10
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[quote:638225c405="rasmataz"]Which engine do you have 2.9/3.0/4.0L???[/quote:638225c405]

the 4.0 its also coming up with high CO
Mar 24, 2009 at 4:49 PM
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RASMATAZ
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High carbon monoxide (CO) emissions are a telltale sign of a rich fuel mixture. On older carbureted vehicles, fuel-saturated plastic floats, incorrect float settings, leaky power valves and misadjusted chokes are often responsible for the rich mixture. On newer vehicles with feedback fuel controls and fuel injection, leaky injectors, excessive fuel pressure and sluggish or contaminated O2 sensors are all possibilities to investigate.
Mar 24, 2009 at 5:05 PM
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SHOGOX10
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then waht about the map sensor. dose it even have one
Mar 24, 2009 at 5:11 PM
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RASMATAZ
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The MAF sensor is on the air cleaner assembly
Mar 24, 2009 at 8:02 PM