fire67bird

I have a 5.3 stand alone out of a 2002 chevy truck with all emissions removed that I am controlling with a 411 pcm. I downloaded a stand alone tune from HP tuners and it runs but wants to die sometimes if I crack the throttle. I'm thinking that this is just a tuning issue. I'm using HP tuners. Can someone please point me to what tables/settings are typically changed for these non-emissions stand alone engines? Also a sample HP tuners file would be very helpful as I can compare it to the one I'm running and make changes as needed.

LSX Power Tuning

iTrader: (4)

Copy and paste from another tune wont help IMO, just needs to be tuned for your setup.

Old Geezer

iTrader: (3)

Post the current tune and some data logs.
How long did the engine sit, B4 U installed it and started it?
Injs clean, fuel psi where it should be?

fire67bird

Not sure how long the engine sat before I got it. I can't confirm the injectors but the fuel PSI is correct.

I attached a screen shot of what the engine readings were when it stalls out after tapping the throttle.

I'm new to tuning fuel injected engines so where should I start? I'm assuming that the engine is not getting the same air due to all the emissions stuff being removed. What would I need to tweak to dial this in? VE table?? Modify spark advance??

LSX Power Tuning

iTrader: (4)

First I would go and delete and disable everything that has been deleted from the original vehicle for the swap. Once the tune is setup for standalone then you can start tuning, fuel, timing, idle, etc.. A screen shot is not going to be near as helpful as posting your mod list,tune, log file, and cfg.. If you can post all that we can get you going in the right direction. If your still lost you may consider purchasing a base tune from someone like myself or one of the other sponsors. Then 90-95% of the tune would be done and you would only have to fine tune a couple tables to get it dialed in perfect.

gagliano7

Do you have the vss (speed) connected to the 5.3 pcm? That will help to have that connected so the pcm knows your speed for driving and idle.

fire67bird

I was thinking that the vss could have something to do with it. Is there a way to run without it for stand alones like mine that run an older trans without vss added?

LSX Power Tuning

iTrader: (4)

You can run one without VSS but it makes driveability harder to tune. Tuned tons of cars without VSS but VSS makes it alot easier. They make adapters to go from cable to electronic or you can add a VSS in the tailshaft.

RonSSNova

iTrader: (3)

For one thing, it appears that only one of your O2 sensors is working.......

I don't have Vss on my 5.3 either, and I've had no issues. I'm going to add it back though. I want the data

Ron