81s

Hey folks,

I dont post to often because i can generally find what i need in the search section, but........

I have a 6.0 with ls3 heads manley ss vlaves. Tsp 231/236 cam dot to dot. Nw92mm tb

4l80e stock rebuild with red altos and tru cool 40k Factory converter restalled to 2800-3200.

Homeade harness. Tsp mail order tune no egr no evap no tq management.

Prob im having is no power under load until over 3k. Wont spin tires. While driving it barely pulls until 3k then it blows tires away.

I ve tried coils off my dd truck with no luck. I ve changed tps and driver side 02

Fresh ngk tr6 gapped at 40 with msd wires.


Please im out of ideas

spot_55

Is this a fresh build or an issue that just started? When I finished my first swap I had a stumble/miss ,and no power down low but all the power when the rpms would come up or at wot. It wound up being I had crossed up my O2 sensor wiring. I had the drivers on the passenger side. Changed them around and it ran like a champ.

81s

Yes just getting the build off the ground.

i can check the 02 sensor wiring. Did you just pull them across?

spot_55

I de-loomed the harness inside the engine to swap them from side to side. I dont think they are long enough to reach any other way.

81s

Well swapped other side and that didnt solve it

81s

Cmon guys anybody got any ideas

81s

Bump. Called a tuner. Came and looked at it and said the mph increases when rpm increases. Figured that out i installed the speed sensor wires for the additional sensor were switched during the 4l80e swap. Pins 22&23
Still cant do a burnout or have any power until 3000 rpm.

Waiting on tuner to come back and tell me something. Any body else got anything to try?

81s

Fuel pressure around 55 with a stock 96 vortec pump

81s

Bump for the headache this is causing. Anybody