Questions for the tunners

[truckdude239]

I have a 71 c10 with 4.8 and 4l60e out of 2004 silverado I can not for the life of me get the 02 ready monitor to run ive drove it over 300 miles in last 3 weeks and it won't set to ready its never set ready since I finished the swap years ago question is is there something in the tune that will stop that monitor from setting? I got a friend thats tunes going to change my cooling fan settings wonder if there is a tune issuse atoping the monitor from running g

[truckdude239]

Ttt

[Gregski]

let me guess you deleted the rear O2 sensors?

[truckdude239]

Originally Posted by Gregski

let me guess you deleted the rear O2 sensors?

Yes

[Gregski]

Originally Posted by truckdude239

Yes

yeah, so it is my understanding and I read about this years ago that you will never get the readyness checks to complete because you would have to install the rear O2 sensors for that, they have to warm up and report back to the PCM that they are ready, well say you do that, will the readiness check complete then, no, what? why?

because the O2 sensors are only a small part of all the junk you need, they sit behind the catalytic converter, which I doubt you installed in an LS swap as it does nothing in terms of performance and is only there to burn the exhaust gases that escaped the engine, ok so fine you install the cat, now will the checks complete, um NO!

what?

yeah its a mess, the system also ties into the EVAP Evaporations nonsense, ok fine, you install the EVAP sensor atop the intake manifold, there will the checks pass now? Nope

are you kidding me?

no now you need to run the evap lines to the gas tank, which means you have to install the stock gas tank, with the stock sending unit, and that has to pressurize to the spec expected by the PCM (aka brain) it's a nightmare

this is why we delete and don't care about this stuff in an LS Swap it's all emissions and SMOG test based

please check out this HP Tuners Tutorials they may help