1986 Nissan Truck 1986 nissan 720 pick up

1986 NISSAN TRUCK
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TEXAZ69
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1986 Nissan Truck 4 cyl Four Wheel Drive Manual

My truck failed emissions.CO's were 39.49 and applicable standards are 25.00.What can I check for,new vac.lines, plugs & wires fuel filter
Jun 24, 2010 at 3:58 PM
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RASMATAZ
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Could be the coolant temperature sensor or the oxygen sensor not going into closed loop mode giving fuel when not needed. to include a leaky injector or pressure regulator that will make run rich at all times.
Jun 24, 2010 at 4:04 PM