Super rich when warming up in cold weather

[Swiggles]

It’s been around 5-10 degrees in the mornings here and when I let the car warm up, 15-25 mins, the ltft has been -22 sometimes when I get in the car. Rev a little bit and it stumbles then settles and trims go back to normalish by the time I’m out of the driveway. But I’m still running rich for the most part while driving around. But wb shows a little lean but not bad. I haven’t tuned with the wideband yet.

I assume this because of the adder tables. Should I try to fix this?

 

[dsmuts]

I've seen guys have summer and winter tunes. You could do that.

 

[Scottydoggs]

scan your ait sensor, maybe its way off. maybe even a bad maf, try the old billboost tap it trick.

when cold it dumps fuel cause thats the choke, my wb on a cold start is pig rich down to 10's then comes back to 14 ish or so when the idle drops to normal.

 

[Fivefingerdeathpunch]

Make the open loop AFR less rich until you reach the closed loop switch over. Or you can zero out the open loop adder table and scale the AFR while it warms up. Like start at 11.8 at -4 and scale it up to stoich once it reaches operating temp. Even make the closed loop switch over high for coolant temp, like 140-150 degrees so warmer and running a lean mixture already before the trims come alive.

I'm just spit balling an idea there.

Tuning the airflow tables will help too if nothing else is off with the MAF/IAT/o2 sensors.

 

[Swiggles]

That’s what I was thinking too. I haven’t open loop tuned yet, got the wb in just in time for the weather to start changing.