1986 Dodge Truck Failed Smog Test

AXHILL

MEMBER
1986 DODGE TRUCK
6 CYL
4WD
AUTOMATIC
202,000 MILES

My truck failed smog; CO too high. Slightly over at 15mph and almost over at 25mph. The cat. Is original. The truck seems to run ok but the fuel consumption was even higher than normal. Where to start?

Tuesday, May 18th, 2010 AT 10:16 AM

1 Reply

HMAC300

MECHANIC
48,601 POSTS

First check to see if there are any engine codes that may be causing the problem. If not, change your oil and oil filter and air filter. Drive the truck about 10=15 miles on the eway and make sure it is good and warm. It will probably pass then.