Hey guys, i have a problem with my dbw.
I get one light accel then it dead pedals,
It idles great. Any tips on what to look for?
I do have a truck pedal and ecm, the pedal works when it has the stock tune loaded up but it won't start, it starts and idles great when its in 2bar OS but the pedal is inop.
If you can't fix it with a Hammer, You have Electrical problems.
What exactly are you working on?
What computer, what pedal from which truck and throttle body?
2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.
If you don't post your tune and logs when you have questions you aren't helping yourself.
Its a gen4 stand alone in a 56 chevy, 5.3lh6 e38 out of a 08 Silverado the pedal came from the donor truck
If you can't fix it with a Hammer, You have Electrical problems.
I should start at the ground floor. Could someone have a look at my Base Tune and tell me what i need to do to make it run?
its a completely stock Standalone 2008 LH6 5.3 out of a 1500 Silverado, I Made the Harness with LT1swap.com's pinout, Has a cold air intake and no CAT's or EVAP. has E38 ECM, Front o2's, stock y-pipe, single 2 speed efan, the starter on its own controlled relay, a port opened up on the intake to run the Th400, E2000 fuel pump and a corvette fuel filter/regulator. This is my first time playing with Standalone EFI so i'm completely in the Dark. All of my attempts to make my truck run have come up short thus far..
55 base.hpt
Thanks!!
Last edited by CousinChevro; 12-31-2016 at 03:42 AM.
If you can't fix it with a Hammer, You have Electrical problems.
So like a monkey at the control panel i pressed buttons until it worked!
but i'm still having gas pedal issues, just not as severe as the 2bar tune..
here is my Working Base Tune and scanner log!
55 base2.hpt
55 good run.hpl
much obliged if someone could have a look
thanks
If you can't fix it with a Hammer, You have Electrical problems.
Do i need to offer money for enticement? I'm willing to EMT for help.....
If you can't fix it with a Hammer, You have Electrical problems.
At a quick glance, the injector data looks to be way off. Flow rates should increase as rail pressure does. This is the basis for all fuel calculations so without good data here, you will likely do quite a bit of tail chasing.
...also take a look at your fuel trims while idling. From the log, its way lean (>25% LTFT + >25%STFT).
Last edited by adunphy; 01-06-2017 at 12:25 PM. Reason: typo
I'm wondering about the 2 bar comment. Is this thing supercharged?
It seems like you're running a close to stock setup. As such, I would take a stock tune file from the Tune Repository to use as a base. That should get you close. Then you can tune a little further to compensate for a cold air intake (perhaps a different MAF location and slightly different airflow characteristics) cat removal (maybe a little more airflow), etc.
Also the truck being and auto make sure you have it set to manual in the tune as it won't see the tcm and could possibly throw it for a loop. Just reading through posts this morning looking to see what I can learn. Always good to search posts and see if others have or had your issue now. I have seen that in older lt1 setups that went from auto to a manual have issues.
First 9 second 6th gen lt4 zl1 stock blower SHC SBE boost only.
2013 cadillac ats 2.0t Big turbo-gone
2007 tahoe 5.3 lsa blower on 14 lbs boost 6l80e swap 2009 os
2017 zl1 a10 big gulp/2 inch headers/ 9.55 lower/ e85/bigger hx /103mm tb / Synergy trunk tank and underhood kit/methanol injection with torqbyte controller and prometh pump / Jokerz performance R&D ported stock blower/ lme cnc heads /GP tuning custom cam. So far 9.30@150
Hey guys thanks for the comments!, It is not S/C'd shes 100% bone stock. I do infact thave the cats on the collectors, but its still a really short exhaust, I do have a CAI that i put together off the BAY it is a little bigger then stock and im using a GEN3 5 wire maf because the gen4 was ugly and wouldn't fit. I have the ecm tuned to Manual and i did a bit of digging through this forum and a couple others and found out i need to jump 2 pins on the ecm for the VSS signal because the TCM is gone. The crazy Lean Fuel Trims, I dont wana rule out a Intake leak or the overly short exhaust throwing the o2's off. I'm still trying to fully understand tuning in general, but im slowly getting it i think. Thanks guys much appreciated gor the responses and please keep them coming! Every little bit helps.
If you can't fix it with a Hammer, You have Electrical problems.
Fuel trims at idle are 60%... i.e. maxed out. Need to work on the MAF and or VE tables.
if it is stock, there is no reason in the world to run a 2bar setup
start from the stock file, and make changes to suit.
keep it simple
Michael Bray
Rusty Knuckle Garage
Slidell, Louisiana
20yr Master Tech.
Advanced Level Specialist
Custom Car Fabrication, Customization, High Performance.
GM World Class Technician
Shop Owner
At first 2 Bar Os was the only way i could get my engine to fire up, I flashed the OS back and forth untill it finally took the vats patch on the Orginal Read File and thats where im at now with what i think is correct,Trans set to manual and DTC's modified for no Evap or rear O2's. Their is lots of good threads on adjusting VE and Maf tables but I don't know where to start.
I really appreciate the comments guys!
I'm gonna try to get at it tonight, correct me if im wrong, looking at a stock engine tune with CAI from the repository, i will copy and paste the MAF and VE tables. Is that a sound method? I will do the HP work tonight and tomorrow at some point i will post my modded tune and a scanner log.
Thabks soo much fellas!
If you can't fix it with a Hammer, You have Electrical problems.
If you still facing issue with Pedal just send me an email and i will share with you the right diagram
[email protected]
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