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cold start but the scanner stopped and a log file with LTFT off

It was all within 2 before I turned the trims back on. And only revving to 6000 so does everything above that still matter?

So even when I am getting all zeros or less than 1 either way in the scanner using the afr error it’s not dialled in?

2000 GMC Sierra EXT cab Z71 2 1/2" lift with 33s
Stock rebuilt L33 5.3 with 799 heads
Built 4L80e with 3000 stall
BTR stage 4 truck cam V2
"TBSS" intake with a Holley 90mm drive by cable...

I kind of adjusted the braf when I was tuning. It is happy where it is in operating range. Doesn’t stall or no hesitation. So you’re saying start at 23 at the coldest ect and then slope it down from...

I am having a cold start issue. Main VE is dialed in, just will not start without using the throttle, use it for maybe 15 seconds maybe then it will idle and it is fine starting when warm. It’s just...

Ok. Thanks. Everything else in the tune look ok?

Return line with no vacuum hose. I think it was you that set that up for me a while ago. Injectors are for a gen 3 flex fuel I think L59 I’m not sure of the part number off hand and rail pressure is...

I have got my VE table dialed in fairly well I would say. Just looking for opinions on ignition timing and what others are running on a 5.3. Also if there is anything else I should touch up in the...

Where were you thinking the ve is still out other than up top? And yes I was planning on running closed loop once it?s dialled in better. Hopefully before winter.

The odd time I?d look and it would be commanding 13 something when slowly easing into the throttle. And ok I?ll try with the fuel trims tomorrow. And yes haha I just multiplied everything above 4400...

So I wrote the 'non referenced' tune file you made for me and drove the truck, it came out 10-15% lean at first. It did run better after I fixed it up a little. I also liked how it was commanding...

Ok I will give it a try tonight after work. I think I?m gunna go without the vacuum line. When you were looking at my tune file did you find anything else wrong or out of place? And the fuel trims...

Ok I had a chance to take a look at the differences in the injector flow rate vs kpa and I now understand what you are saying. In your opinion what would be the better option? should I just leave the...

So I should put a vacuum line on my regulator and change the injector flow rate? That will just affect the fuel pressure at high manifold vacuum, like WOT correct? The guy who tuned it before had the...

L59 gen 3 injectors and it?s 58-60psi key on same as idling. Never hooked a vacuum line to the regulator.

Hi. I had a local guy start tuning my truck and he just threw a random tune he already made for a 6L and it was kind of running like shit and the fueling was rich and lean all over the place and he...

Hi can someone help me please? i am having issues with spark knock at idle, not sure if its false or not and also as soon as i put it in gear it wants to stall and same thing coming down off of rev...

ok thank you i will give it a try tomorrow

i was looking at 36lb acdelco ones from summit. i can do that over the winter, i just have to get it running and somewhat drivable to get it up the road for winter storage, snow is coming soon.....

Really bigger injectors? I was told the stock ones will work n/a by someone. but i also thought I needed bigger. The screw on the Holley maxed out tps is at 2.2. also i have it set up for speed...

Hi, I have a 2000 GMC Sierra 1500 Z71 originally had the LM7 5.3 I did a full rebuilt a L33 aluminum 5.3 stock rotating assembly new bearings, rings, arp main studs and rod bolts, BTR stage 4 truck...