im tuning a 2010 camaro ls3 with american racing headers, a lmr intake, 160 tstat, custom dynomax muffler setup, and a texas speed 231/236 duration cam. Ive been experiencing bucking around 1100-1600 rpm coasting around parking lots and the car im tuning also has bucking/surging at freeway speeds as high as 2300 rpm when lightly rolling back on the throttle after lifting and letting dfco take effect. I started noticing when troubleshooting the throttle pedal for a possible dead spot that the throttle pedal acts funky. When the motor is warmed up and idling, the idle will not raise until the etc pedal pid is at least 6%. Once the motor revs off idle the pedal must be brought down to 4% to return to idle. What is funny is that on hptuners and an independant scanner, i see a change in the maf for the first 5%, a change in spark timing, but the rpms wont change from idle until the pedal sensor pid hits 6%. I also observe a slight change in the tps absolute pid and a change in the pitch of the idle. Ive read about most of the bucking/surging issues with cammed ls3's and wanted to see if anybody else can recreate the problem and if it has anything to do with hesitation/bucking on the ls3 in general. The 1800-2100 rpm buck has been with the car since it rolled off the dealer lot.
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Originally Posted by DSteck
