Search:

Looks like your VE table is totally stock, your long term fuel trims are probably maxing out trying to accommodate your SS2 cam. Do you have wideband O2 data?

Did you ever get this problem completely figured out?

Hey did you ever get this issue figured out? I'm a south Louisiana guy with a turbo 4.8 experiencing similar issues (albeit intermittent) doesn't sound like the exact same thing but I am curious what...

Thanks for the heads up, this is a swap vehicle, I'll fix those things right away. I don't know a ton about what all I need to disable in the system options, just the basics for running in speed...

Hi all,

Running a 3Bar COS P59 ecu (DBW Throttle) on my turbo 4.8, and I'm getting an intermittent issue in which sometimes during a pull my computer will command an AFR that is either very low...

Okay, perhaps the shutting off/sluggish issue is unrelated? I'll have to test under load, unfortunately I wasn't datalogging when I first experienced this issue and I'm waiting on a new oil feed...

Yes I know, and the absolute pressure is decreasing, same as saying it's making more vacuum.

MAP is in stock location (LS1 intake manifold) and this combination has worked fine for a year. Notice in the log that as Throttle Position increases and RPM increases, MAP decreases.

Hey everyone,

My turbo 4.8L with electronic throttle body has developed a problem in which it makes VACUUM when giving it throttle. Engine felt very choked down and started shutting off when I try...

Thanks for the idea 5FDP I'll give it a shot!

Hey guys, I've posted in here before and y'all have always been a huge help, my tune has come a very long way thanks in large part to you guys so thank you (especially 5FDP, you da man).

So my...

Lo and behold it didn't do the random 8 degrees of KR thing again, and didn't throw any codes. Seems to be an intermittent issue, but I log pretty much every time I drive it so I'll be sure to check...

Thanks for the suggestion, I'll give that a shot and report back with what happens. You're the man! Always the one who replies to my tuning woes with helpful ideas lol

Hey all you tuners, I'm getting maximum knock retard (-8 deg) randomly at low speeds, despite never getting more than 1 or 2 degrees of KR at WOT. It's a 4.8 with a sloppy stage 2 cam and single gt45...

Just to follow up, I've now measured 5psi of boost so it did indeed work! Thanks again for the help

Nevermind I did it again with the key on and that did the trick! Thanks so much man, I'm gonna go try this out and hopefully log some boost!

I have re-polled for supported parameters and the weird thing is that I can actually see "Manifold Absolute Pressure - 3bar" for a split second while its running through all of them, but then after I...

I have a gen3 4.8 with p59 ecm, just installed a turbo and 3bar MAP from efisource and did the 3bar custom OS upgrade. After getting the car driving and then ready to get into boost for the first...