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1986 Nissan Truck 1986 Nissan 720 pick up

TEXAZ69

MEMBER
1986 NISSAN TRUCK

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

Thursday, June 24th, 2010 AT 3:58 PM

1 Reply

RASMATAZ

MECHANIC
75,992 POSTS

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.

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Thursday, June 24th, 2010 AT 4:04 PM

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