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It could in on a cold day your car will use more gas to air (rich) because the cold air will support more gas! Your car will run like a dream if it is set up right on these days in computer cars a easy cheat for more preforance is to put ice on the intake so your computer thinks it is cold you will see guys at the drag race track doing this as fas as on thernost I would guess maybe it is the problem and a cheap way to try to fix is put one in what can it hurt but being a 86 it is probley a oxygen sensor that is at fault

2011-09-12 13:59:49
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Q: 1986 B2000 truck it failed Calif smog test for high Co and Hc's would running the truck without a thermostat cause it to run rich because of the lower operating temperatures?
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