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and i can vouch that every dollar spent is well worth it. be prepared to stop buying parts - the dude can tune anything you can throw at him.

I've had seasoned offroad truck tuners / owners /...

Hats off to you real tuners who know and understand all of this. Reading these posts and responses is incredible to me - it's like a lifetime of another language that you all are speaking fluently...

hey dan - check out New Era Performance up in Agoura Hills. Alex is the owner there and a great guy. he's got some great videos of his drag truck on youtube somewhere. Once i'm done working with...

Big update:

- Brand new GM factory engine harness
- " injector harness
- " fuse block
- " LT4 throttle body
- " throttle / app switch assembly
- TooHighPsi port injection system with...

thanks for these Greg. I have an alldata subscription and had already ran through the diagnostic process on the codes prior to posting - i may not have mentioned that, but that was the reason i...

this lesson applies to all service industry operations as well. i'm in large scale commercial construction and the parallels are unreal.

- your friendly late night forum lurker...

updates / questions:

P0178 - Fuel Composition Sensor Low Freq (new one - i'm not a flex fuel truck and don't have the sensor)
*Validated replacement connector and pigtail splice, cut out...

Does VATS cut fuel or ignition? There may have been not a full VATS system disable going on…

now i'm going to transform into paranoid data analysis guy...

engine oil temp = -40 deg

i'm...

Verified correct harness orientation and side placement, reassembled, writing now, update shortly…

**edit- fixing the throttle body info, had to go back and look at what i ordered as it changed twice during the build... final answer is 95mm "lt1/lt4" tbody from Granatelli.

P0178 - engine > fuel > flex fuel > general > flex fuel: disabled - DONE
P0178 - engine diag > P0178 and P0179 > SES Enabled (left alone) > No Error Reported - DONE

P0178 - excellent - thank you!! curious on the ability of the stock system still... with ethanol in all of the fuel in varying amounts (or changing at least) does GM have flexibility built into the...

updates / questions:

P0178 - Fuel Composition Sensor Low Freq (new one - i'm not a flex fuel truck and don't have the sensor)
*Validated replacement connector and pigtail splice, cut out...

these things are a process for sure. i came here a day after setting my motor and bolting up the trans thinking i was going to start it up the following week... riiigghhtt.... i was immediately...

just came here to say - this entire thread was:

- entertaining
- awesome
- loaded with great info

Sirius - you are effing awesome for sticking with this all the way through. I'm sure there...

10-4

at this point, there are a few consistent thorn in my side codes that keep rearing their ugly little heads after code diagnostics / clears / etc. i've sorted out which circuits they pertain...

that's my working theory at the moment - could end up being something else. Heading back out now...

**Edit: its something else. i've got a "TAC disabled" readout on a PID on the Autel. More...

updates to the post last night:

1.TB Self Test / Ice Break Mode: still sorting this out but i am no longer encountering ice / break dance mode. The TB is silent on KOER as opposed to the high...

a few things on the agenda for tomorrow:

1.TB Self Test / Ice Break Mode resolution: did a little digging in alldata to see what i could see. turns out that its going in to "icebreak mode" which i...

Greg - read a few of your older posts about direct wiring in the whipple harnesses, so tackled that and checked it off the list, then dove into airflow. Intake off to get visual on the tbody blade...

sensor audit last night - here's the summary along with screenshots of sensors being described so that we are all speaking the same language - more for me not you guys. If a sensor is not listed...

so, confession time - the fuel system up until today had an 8AN line directly feeding the hpfp. I have a check valve back between the abs module and the front edge of the tank but it wasnt cutting...

at least it was polite and gave you a heads up (pending)...

x3 on this - i'm swapping the other way: lt1 into an l83 based sierra. ive got the exact same symptoms including the fuel cut: unknown 00 12 pid readout on fuel cut, 0psi at rail, etc. mine is even...

yeah, i figured i likely wouldnt need it but in all honesty i got spooked by the lt4 hpfp situation - going on 1 year of backorder. what are your thoughts on the lingenfelter hpfp? i have a hard time...