I'm still working on getting my friends 4.8 tuned. It has the cruise control effect when you let off the brake. It just takes off.
This is typically cured by tuning the Desired Airlow in Gear with the RAFIG process. However I can not get the idle trims to activate. They stay X'd even after logging has started.

This would be any of the IAT-Long term/Short Term correction pids.
Anyone know why I can not get them to read?

Vehicle is a '99 Silverado 4.8 4l60 214/220 110lsa. Idle AFR is about 15:1 and timing at idle is 20-23


I've increased and lowered B4307 in large and small increments and see minimal response.

 

What i just did was log the grams/sec directly from the MAF instead of using the idle trims. I suppose you could use the Calc pid for the map sensor todo the same thing for the SD

 

Posting up the tune would probably help

 

I'm going to go through the VE tomorrow and make sure it's good since I haven't spent a whole lot of time on it with the wideband. But for the Desired airflow do you still add the readings to the table when using the Maf G/S like you do the stit/ltit's?

 

I'm testing your MAF theory out on my truck so that When I get to his I know what to do. I turned my MAF back on and was only getting a reading of 1.58g/s. Does this mean My MAF is bad or could there be another issue? I'm pretty sure the wires are hooked up but I'll double check.

 

No you dont add them, the numbers in the log you just copy and paste them into the table. But themwhole process requireamthe maf table to be tuned/ calibrated
Sounds like your maf is bad or you maf table is horribly off

 

The mad table is stock. I've never touched it. Plan on using it again tho so I'll try another maf.