TBI tuning troubles!

[bluechevy194]

hey guys having some troubles tuning my my tbi truck, i am having lean spikes at every shift point, and when i take off from dead stop, weather its fast or slow, my truck goes way rich for a sec. then levels. just wondering if u guys could tell me what tables i need to adjust for these problems?

[Fast305]

hey guys having some troubles tuning my my tbi truck, i am having lean spikes at every shift point, and when i take off from dead stop, weather its fast or slow, my truck goes way rich for a sec. then levels. just wondering if u guys could tell me what tables i need to adjust for these problems?

Get the VE tables right through BLM correction. Then work with MAP AE and TPS AE. You might also have to work with the IAC a little.

[HaulnA$$]

hey guys having some troubles tuning my my tbi truck, i am having lean spikes at every shift point, and when i take off from dead stop, weather its fast or slow, my truck goes way rich for a sec. then levels. just wondering if u guys could tell me what tables i need to adjust for these problems?

When you are saying "lean spikes" and "going rich", what are you using to determine this? If you are using a Wideband O2 sensor, how lean or rich? If you are using the factory narrow band O2 sensor, don't. They are ONLY accurate at or around 14.7:1 AFR. Many times they will indicate lean when the mixture is actually rich and vice-versa. The further away the actual readings from stoich, the less accurate they are. BTDT. HTH.

[bluechevy194]

i sorry i forgot to mention i am using a wideband tuner, when i say the leanest shift point is usually from 15-15.5, and the rich one goes down to an AFR of 10 when i take off from a dead stop besides that the ve table is mostly set, im in the 14's in around town driving and 12.5-13 at wot.

[HaulnA$$]

i sorry i forgot to mention i am using a wideband tuner, when i say the leanest shift point is usually from 15-15.5, and the rich one goes down to an AFR of 10 when i take off from a dead stop besides that the ve table is mostly set, im in the 14's in around town driving and 12.5-13 at wot.

O.K., for the rich dip at throttle stab, tune the "AE vs. Delta TPS" and "AE vs. Delta MAP" tables. For the lean spikes at shift, it will never totally go away as the TBI is a wet flow system. It is due to mostly intake manifold reversion during the load change and is not accounted for in the calibration. The following will help some. Tune the VE table at WOT at full load in 3rd gear (assuming auto tranny) as much as possible. The benefits of tranny gearing will skew AFR readings in the lower gears. A free flowing exhaust with long tube headers will help some as well as a higher stall torque converter. HTH

[bluechevy194]

ok cool thanks for the help, i figured it would be those two tables, but im really new at this so i didnt want to mess anything up to bad, as for the lean spike, it shouldnt be to hard to take care of i guess since i have the torque converter, headers, and exhaust as u recommended.