2004 Silverado 5.3 - Lean fuel trims issue

[SilveradoJim]

Hi guys,

I have a 2004 Silverado 5.3 with the following mods:

AFE Stage 2 CAI
Summit Racing Shorty Headers
Magnaflow single in dual out catback
Comp Cams XR265HR 212/218 .522/.529 114lsa
GM blue valve springs

I am trying to get my VE table dialed in right now. With the MAF disabled the fuel trims are rich(0 to -5). When I enable the MAF everything goes lean(0 to +10). Could this be a vacuum leak issue, or is something amiss in my tune. Bad MAF sensor maybe? I sprayed carb cleaner around my engine to try and find a leak but didn't catch anything. I also cleaned my MAF with CRC MAF cleaner and that did not resolve the issue.

This is the first vehicle I have tried tuning, any input would be greatly appreciated.

Sept 3 Regular Tune.hpl
Sept 3 VE LOG TUNE.hpl
JimboTruck.hpt
JimboTruckVETune.hpt

[DWC]

You are close enough to disable LTFT's and set the VE off of STFT's........ Not that bad now... I'd hand smooth the VE table, those are some big jumps from 90 to 100.......

DWC

[DWC]

Tons of power left on the table here Jim.......

DWC

[SilveradoJim]

Tons of power left on the table here Jim.......

DWC

Hehehe awesome. Good to know I can get more.

[flame]

Have you touched the maf table yet? The Cai will make a difference to that.

[SilveradoJim]

Have you touched the maf table yet? The Cai will make a difference to that.

Not yet, I will definitely get on that.

[SilveradoJim]

Just dialed in the MAF table it made a huge difference. Did some more work on the VE table as well. Fuel trims are where they should be. Thanks for the tips guys.