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I have not pulled them out to inspect yet. Attached are my best running tunes to date. You can see I still have the issue with or without PE enabled. With PE its running 12.5 afr and 0 spark due to...

Sensors were not removed and are original. Still having this problem. other than a vac leak what other mechanical failure should I look for, Loose rocker?

It was a Craigslist engine, you think it's bad? Sounds and runs good until you hit 3k rpm. Do you think it's mechanical or in the programming?

i changed to first err on the maf, compared and copied a repo 99 camaro into knock table and turned on spark smoothing. I'll drive it this weekend, i did spray round intake with carb cleaner and...

I found an article that says to go from 2000-4000 rpm in increments then sweep through that several times smoothly to tune LTFT. I did that last night and the results are attached. It's like the same...

I don't see anywhere the headers touch, running a new timing chain with damper, pac springs and have good oil pressure. I think those numbers in the KR table are stock for a 5.3 since that's what I...

I have it running decent for county roads and the freeway. It cruises around real nice but it always seems that I hit the KR wall around 3000 RPM. Ive attached a couple logs and my tune; any long...

Thanks I've only looked at table view and imported changes from scanner

next on the list of tuning woes fighting kr. 99 4.8 with 862 heads and cam getting kr when rolling into throttle. ive pulled a lot of timing and stft are mostly in neg so im kinda stumped. since its...

Thanks I've doubled it, changed the delay to 50 rotations and also it looks like my prime inj pulse was maxing out in the 50s which I'm sure is flooding the engine with 60lb injectors. I took 60%...

New issues, I can get a nice low idle with normal amounts of timing but having difficulty getting it to start without holding the throttle open all the way while cranking. I've adjusted the ve down...

Found my vacuum leaks and also noticed the gasket provided with the intake blocks off iac. I'll fix this and start over.
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Sprayed injector and tb gasket area with carb cleaner and it almost dies so I'll start there.

Thanks, I'm using the 99 in modified throttle bod and a bbk intake manifold with only one vacuum to the booster. I'll plug that off if the diaphragm is bad and start spraying with carb cleaner to see...

So I took your advice and used a 5.3 tune from a friend that way I knew it was unaltered. I did the following

put repo 99 4.8 Low/ High spark, VE table in it.
reduced low RPM VE due to cam and...

Wow thanks Monty, I am very new to this so I appreciate all the information you provided. I do have a known good stock file but it's for the same year 5.3 that I pulled from my ecm. I'm guessing the...

Sorry last Wednesday we welcomed a boy into the family. The only way to get it to idle down is put it around the 10-11 afr mark via wb. I know it was mentioned that the wb most likely wasn't correct...

I found this in the help file. I did adjust and got a good idle even though it reads rich on WB.


Main Spark Table Selects
If either of these TPS or MPH values is exceeded the VCM will select...

Thanks, I have a followup question to that. I have no speedometer reference for the VCM due to the transmission and speedometer I'm using. Could I Zero both the speedometer numbers and only have it...

Thank you, I'm pretty green to it. What area is the 400 kph in that you mentioned? I'll change to 0

Fogot to attach layout and injector data

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Before you flame me I've read the posts for idle and watched the youtube videos. I cannot get the afr to 14.6 and have a low idle; it's either 14.6afr and 1200 RPM or 10afr and 750 RPM.

Ive tried...

I recently got a fresh VCM and have been flashing tunes without problems. Last night I installed a SD 1 Bar map OS, saved as new file, Closed, opened new file and did a write entire. The RTT enable...

I purchased an engine with wiring out of a 99 4.8 several years ago. The project hasn't went as fast as expected so the ecm has just been sitting in a box for a while. Today I made a bench flasher to...

mbray01 thanks for posting and I've been on the quest to better my trucks performance and fuel mileage. If anyone else can chime in I would appreciate it. Its a VVT 4.8 with a Comp 210/224 110 cam/...