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If I understand VCM Edit correctly, all the Idle Switch does is enable/disable Active Exhaust at idle; perhaps it's tied in to the Quiet Start option...

I do understand that the factory O2 sensors are for closed loop. It just seemed like a good idea (if it was possible) to run MAF/closed loop for...

https://html.duckduckgo.com/html?q=site:forum.hptuners.com "baro breakout"

It needs tuning, not changing settings until it runs better. Collect data, apply to tune, retest.

I appreciate all of the information. I may try to get the truck running for now, but I think different injectors may be in order before I start...

That's agreeable. I forgot, on that late night a while back, that i had figured out the as429 was a 3 bar MAP, sitting at 2.978bar at 5v. Duh. I'm...

Yep, sounds like you need a more experienced tuner. As a hobbyist, I usually right off a so called pro when they attempt to bullshit there way...

Back in 2005 I was trying to set up a "base tune" for a DBW cam swapped 4l80 swapped turboed lq9. When the transmission started in 2nd gear and...

https://www.rockauto.com/en/partsearch/?partnum=AS429

Truth be told, you have no way of knowing without precision measuring equipment whether GM or Standard Ignition are putting out the exactly correct...

Thanks again you guys.. I'm going to contact him tomorrow... he was trying to blame it on sensors

That makes perfect sense and something I never thought about. Thank you for the insight. I will put all the random ones that are not necessary for...

Yeah the COS defaults the VE to a single number, but, segment swapping a COS file scrambles it again. Even if the VE had been set up right before the...

Once you get heat soak after shutdown, the vapor pressure forces the rest of the fuel out of the rails. So my observation about the difference...

DTCs are more than just turning a light on if/when there is a problem. They run entire diagnostic routines, some simple but some rather complex, and...

Since it was a while ago, I just checked back on my math. Yes, it appears to be a 3 bar map even though it was marketed as a 2.5bar.

On Oreilly's product specification page it lists OE reference number 55567257. A search for that number then gives the LSA 3 bar applications.

Every 2 bar or 3 bar COS I've applied to a Gen 3 does that to the VE table. I just copy the original 1 bar table and apply it to the 1 bar portion...

Where are you finding it to be a cross reference for GM? Not that it doesn't cross reference, but i got my data from standard ignition who...

Just to be on the safe side, put something around 1.3 in place of all those 63.whatevers. Change the enable MAP to 105, and put some small number...

Im not the tuner..but i did enter in the injector data for the new injectors. it wasnt me that caused the scrabble??it wouldnt start before i touched...

Most everything that is changed, (minus a chunk of the DTC's reporting) had a positive affect or I put it back to stock. Part of the issue is I...

I also had a coworker use a fuel lab. I have a video of the gauge when the pump stops the pressure drops pretty quickly. Im not too worried about it....

although im not sure how to fix that..

jesus... i owe you guys.. changed ve table...and it runs with fuel pressure...but now it hunts up and down advancing timing..1200-1500 rpm.. i just...

I have little to no experience knowing what does what in the DTC list, other than what seems intuitive. I'm coming to understand there are many bugs...

I saw that in someone's file a while back and wondered what the hell had happened to it. It was one of those "unknown tuner" deals.

Found the other thing that gets scrambled: