IAT at idle and AFR

[ttls1]

Hi, I was just wondering if there is a multiplier somewhere that would affect the AFR relating to IAT. The reason I ask is yesterday afternoon I noticed my AFR at idle was indicating approx 13.2 on the wideband when the PCM was commanding 14.63. I ran a quick auto VE at idle and adjusted the VE to suit and measured AFR exactly matched my commanded AFR. This morning I was logging for RAFPN and noticed once the car was up to temp the measured AFR was back around 13.5. The only difference I can see is the IAT's this morning were 22 deg C and yesterday due to a hot engine bay and high mount turbos the IAT was 55 deg. Could this temp difference be causing the issue?

Cheers

[darcy]

If it's a COS, running SD, then A0014 is the table you want.

Something doesn't add up though - Initially it went Rich with Higher IAT, then it went Rich with Lower IATs

[statesman]

Something doesn't add up though - Initially it went Rich with Higher IAT, then it went Rich with Lower IATs

That's what I was thinking too.

[ttls1]

Thanks for the help, it's COS 5 in SD. I will have a look at a0014 and try to work out what's happening