yes, i am using a wideband. unless it is misreporting i am at 11.8-1 on every run no matter what temp.

 

You are running 11.8-1 but the density of the supercooled air is greater causing the lean condition.With this condition on a carburated setup you would encounter a icing condition that would eventually cause the motor to stall.

 

i am not running lean, ever. cold or hot my a/f ratio is dead nuts on. it was pasing more air when cold(and fuel of course). but wasn't much if any quicker.

 

Do you think the extra fuel and air is raising the compression ratio? I dont know this is just crazy. I'm affriad to drive my truck out in the cold now

 

I kind of see what Whitt1 is saying, even though you a/f ratio is dead on, at 10 degrees your getting into extreme low temps. The air has so much more oxygen you may need to richen it up more than what works well in normally operating temps???

 

i have no idea wtf you guys are talking about!

 

Yeah maybe 11.8/1 is the ideal A/f ratio normally but with it that cold maybe you need more like 11/1 A/F ratio.

 

Pfm

 

well, that could be, dont really know what the best a/f ratio is at 10deg.

 

Are you going to change the A/F ratio if it gets that cold again just to see what happens? Maybe alittle bit richer than normal is all it needs? I don't know. If you do try it post your results. Thanks