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Man I never get the second prompt. It gives me a prompt to cycle at 50% but not again at 100%. I did read, then saved initial, then started modifying and saved as a separate tune. I think this is my...

That didn't work, unfortunately

I'm having this EXACT issue... To make matters even worse, it's my coworkers truck, and he's now convinced I have to pay to take it to the dealership.

like some other people said- .60079 on the cylinder volume, thats probably messing with the ve math a lot

youve got bank 2 pulling something crazy like 25% fuel out,without a wideband its...

Hi all, I'm trying to diagnose my buddy's car. It's a 2000 truck pcm, PSI harness, ls1/4l60 out of a trans am, all in a foxbody. The car runs great but it has a weird issue. Every time the MAF gets...

I agree that it's probably misfires if it's listening to you through the vcm scanner controls.

1. Even with the misfire tables maxed out you could be having persistent "misfires." those tables are...

Keep us updated on the TAC module. I?m anxious to see if it fixes it. This is one I?ll have to remember. I?ve never even heard of a TAC module going bad.

maybe ohm the wires to your crank and cam sensor? You have fuel, air, and spark. This is ridiculous lol. I'm starting to think maybe you got a bunk cam or crank sensor. Maybe the timing is just so...

I'm unfamiliar with the TAC modules. I didn't tune my c5 or my V, this old truck is my first tuning experience. Can you try pumping the pedal while you crank it? Your tps is solid at 16%. even better...

Wait... try enabling the MAF SES stuff and setting it to MIL on first error.

Also, for shits and gigs, I pulled my fuel pump fuse and cranked my truck to see how it acted. My injectors sort of...

Few weird things I noticed:

You're only logging bank 1 injectors? Is that correct? Maybe you left the other bank unplugged. You're either not logging bank 2, or they're just not plugged in and...

update- engine runs well and alcohol sensor is working great. Trans feels fine now too.

I figured out in the system options table that the Tahoe has two "Alt Term" boxes checked and my old file...

Just to be clear in case someone stumbles across this thread: Nothing mechanically changed on the truck except for the flex sensor. It's the same motor, injectors, cam, fuel lines and tuning...

Well I?m running the SD os on both, so I didn?t think the maf would still act funny like you said, And you?re right! My 2000 is runs great just the way it is, and I tuned my VE table for my cam and...

My truck- 2000 4.8
downloaded os- 2002 tahoe flex 12216125

Hi everyone. I wired up my gm flex fuel sensor today and downloaded the 2002 Tahoe flex fuel os. I wrote the Tahoe flex os to my...