1991 Dodge B250 van with 5.2 failed CA smog HC test but only at the 15mph part

Asked by Oct 02, 2016 at 02:18 PM about the 1991 Dodge Ram Van 3 Dr B250 Cargo Van

Question type: Maintenance & Repair

New cat 20K miles ago it runs great ,tuned up about the same time, I did the water pump , radiator and 160 degree T- stat as well. The temp gauge never goes up like it use to. Is it running to cold for the computer ? it runs just fine. I drove it up the freeway before taking it in and let ti idle 45 minutes while waiting for my turn.

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