well i burned another chip today to see if i could remove some of the richness in my idle, and light throttle. i was hoping to remove a little tip in hesitation in the process. also i had a little knock at TC lockup, so i wanted to trim that down.
this is what i did. (notes from the comments section in promgrammer)
lowered timing on TC lockup (55mph) 2000,2400 rpm vs. 150,165,180 kpa.
lowered fueling in the F29E table around 800-900rpm and 48-54kpa (about 3 clicks)
lowered fueling in the F30 table around the 0 to 2000rpm area (about 2 clicks)
what i was surprised to find, is that, a leaner mixture, although still rich to the O2sensor, didnt make the truck idle better, but instead it started to hunt just a little bit. idle was just waving between 800 and 900 rpm. it seemed to lose the ever so slight tip in thing it was doing, but now the idle is bothering me. i guess i fixed one thing but caused another. i really thought i understood the tables and what they did perfectly. but im not sure what would cause an irregular idle like that. mabe there is more tables than the two im using? mabe im a nOOb and a cracker? mabe my truck doesnt want to idle at what the O2 thinks is a good mix? i probably need to drive it more, to really get a feel for what its doing. theres always tomorrow
BTW: for those of you that dont know, im chip tuning a 512 lift mccoy cam. i started with a chip that was written for a stokes grind cam, so its in the ballpark already. just needs some fine tuning!
e
this is what i did. (notes from the comments section in promgrammer)
lowered timing on TC lockup (55mph) 2000,2400 rpm vs. 150,165,180 kpa.
lowered fueling in the F29E table around 800-900rpm and 48-54kpa (about 3 clicks)
lowered fueling in the F30 table around the 0 to 2000rpm area (about 2 clicks)
what i was surprised to find, is that, a leaner mixture, although still rich to the O2sensor, didnt make the truck idle better, but instead it started to hunt just a little bit. idle was just waving between 800 and 900 rpm. it seemed to lose the ever so slight tip in thing it was doing, but now the idle is bothering me. i guess i fixed one thing but caused another. i really thought i understood the tables and what they did perfectly. but im not sure what would cause an irregular idle like that. mabe there is more tables than the two im using? mabe im a nOOb and a cracker? mabe my truck doesnt want to idle at what the O2 thinks is a good mix? i probably need to drive it more, to really get a feel for what its doing. theres always tomorrow
BTW: for those of you that dont know, im chip tuning a 512 lift mccoy cam. i started with a chip that was written for a stokes grind cam, so its in the ballpark already. just needs some fine tuning!
e
