Cold Start High Rev

[hrspwr]

Having a weird issue with cold starts. When the motor is first started, timing is at 2-4* and the idle is at 1600rpm. After 5s, timing will jump up to 14* and the idle increases to 2000rpm. This hangs for a bit then starts to settle down.

Can someone step me through how spark gets calculated the first 30s on a cold start? The motor is an LS1/A4(0411 with 12212156 OS) with a cam(226/234 113+2) and stall(yank ss3600). Thanks.

[joecar]

Are you getting any DTC's...?

Is the MAF working ok...?

Increase low end of MAF table to say 20 g/s.



It might be easier to flash in a stock F-car 12212156 A4 tune and start again (tune VE and MAF and idle).

[hrspwr]

No DTC's, MAF is working properly and the car runs fine. The only issue is on a cold start the motor revs up and then settles back in. From the log, I can see the spark advance jumping up which I believe is causing the issue, but not sure why that is.

[joecar]

Post tune and log.

[hrspwr]

Post tune and log.

I was able to figure it out. It looks like the Desired airflow tables were too high and after doing another RAFPN it corrected the issue.