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I'm using DSteck's 3 bar map sensor in which he provides the appropriate data online. Maybe it is mistyped on the website or something. Maybe he will chime in.

Also, on the MAF dtcs, I don't even...

I'm starting to wonder if my running 43 psi base fuel psi has anything to do with it. Do any tables need to be changed for 43 psi base besides IPW? I have all of the injector data for my injectors...

Hello everyone, I started my turbo 5.3 up for the first time the other day and I was just curious what everybody thought about this. My ltfts are reading 25 and my wideband is showing that it is...

Oh wow. I've never seen these before. I'll have to use one of these on my truck that will be done soon.

A lot of people use this one on truck intakes.

http://www.efisource.com/shop/ls1-style-3-bar-map-sensor/

I am having some very strange lean issues and I have tried just about everything to no avail. The setup is an LS3 525hp crate engine. You would think that you could put a stock LS3 tune or even THE...

The e38 ecm in this thing has different parameters than the e67. I tried to copy a stock LS3 tune over but the offset vs pressure vs ignv table doesn't match up perfectly. The closest to 400 kpa in...

I vacuum referenced the fpr and flatlined the ifr and I checked the injectors and made sure they were actually stock LS3 injectors. It is still showing lean 19.5 afr (as high as my wideband will...

It's an aeromotive fpr but not boost referenced. No vacuum line. The ifr only needs to be static if boost referenced, right?

It isn't boost referenced. Something has to be off though. There was somewhere close to 70% error at wot when logging lambda error vs maf. With a mild/moderate cam LS3 I can't imagine the error being...

Could any of these problems occur from having a return style fuel system instead of the stock style system? Just throwing ideas out now lol. The vehicle has a 15 gallon fuel cell with an aeromotive...

I thought it shouldn't be referencing the VE table at all, considering it is running in MAF only?

Does anyone have any ideas? I know my MAF curve is fugly lol but I've got the trims where they are supposed to be.

Here is my tune and most recent log file. Please look over it and let me know what you think. You will see that when you go from cruising at speed to letting off the throttle completely, it goes full...

I'm running maf only currently. Ive got the idle and part throttle within +-5% so I'm confused on why it would do this. It goes full lean on startup until the fan kicks on at 195* and it goes full...

Is this normal with dfco disabled? The injector pw or spark doesn't go to 0 so I didn't think dfco was on, but
It still goes full lean when I let off the throttle.

Here is the tune and the most recent log. The log still has some high values, but the after this log, I sat and dialed the idle in, so the idle is within +-5% fuel trims in that tune file. Everytime...

I haven't been using a wideband for part throttle tuning so I'm unsure on the afr. The engine is a brand new GM LS3 525hp crate motor. It has the GM ASA .226/.236 .525/.525 110 cam. Engine is swapped...

Yeah, I have raised the idle airflow and I wasn't having the idle surging in gear problem until after a couple times correcting the VVE. I looked at the 3d map of the VVE and noticed the values in my...

This was very helpful. Thanks. The only problem I'm having is everytime i get the idle within +-5% of the fuel trims, it idles horrible. When you put it in gear, the idle bounces around and surges...

Hello everyone,

I'm currently tuning a cammed LS3 and I've already tuned MAF only. Now I'm on to VVE tuning. Just curious how you guys are smoothing the VVE values? I've data logged VVE vs LTFTs...

I'm doing some VVE tuning on an LS3 currently and I set the MAF fail high to 0 hz and set P0101 102 and 103 to ses enable and MIL first error. It came on and I logged and made the appropriate...

Okay, thanks. I was hoping that would be the cure. One other question, it starts up perfect and idles well right now but when I blip the throttle, it drops the rpms lower than commanded and recovers....

I've been battling this for a few days now and can't figure it out. The engine is an LS3 with GMs ASA cam in it. Specs are .226/.236 .525/.525 110. I copied over a stock ls3 tune and the only things...

Anybody? I'm mainly just curious why my trims are so lean before operating temp and what to do about the surging and dying when fan or ac comes on.