000martin

if this is posted in wrong category i apologize,

I need some help.
just finished rebuilding an 06 Sierra denali
lq9
new bearings and full rebuild.
220/224 cam
lontube headers
3200 stall

Everything has went good on install and first fire startup, couldnt ask for better

I just ran into the first issue, and wanted to see if any of y’all knew or had advice. I have been driving it for break in (roughly 250 miles on fresh rebuild). After driving backroads for a 130 mile roundtrip to a family gathering yesterday, it ran great. Not a problem. It sat and cooled completely off. When i fired it up to run an errand later that evening, it ran good for 15 minutes or so, then went into a ‘reduced engine power’ mode and died while rolling down the road. I pulled over and checked all fluids, full and fine. Cycled the key a couple times and it fired right up. However it will drive, but with no backbone. It has no get up and go, just a mushy feeling. No limp mode showing on display.

the truck had a base tune put in it when i first finished the rebuild so I could break it in.

FFDP

iTrader: (2)

REP should toss a DTC code.

It for sure still needs more tuning to help prevent this issue.

000martin

Thank u. After break in it will get tuned again. I’ll see what happens after that

madmann26

iTrader: (7)

Specifically, the 'Calc Airmass' table needs adjusting.

This table is measuring airmass that is being passed at a given throttle position and RPM.

To much air, REP mode.

06murder

Delete maf an go to speed denstity

000martin

How do I go about deleting the MAF ? Thanks for the replies

FFDP

iTrader: (2)

Keep the MAF, you have no reason to remove it.

A good tune done with a dialed in MAF curve and VE table is better than just a speed density tune on a NA setup. The MAF sensor is very accurate.

The problem you have now will be corrected once tuned properly and the whole dynamic airflow model will work just fine.

000martin

I looked into the SD swap and it seems a little finicky for a truck that will be driven a good bit. I think I’ll keep the MAF setup. Yesterday i pulled the MAF sensor out and looked at it. Wasn’t dirty or clogged up at all. Just had a slight film of dirt or oil from the new filter on the screen. The elements inside were clean. So cleaned it with the correct spray and drive it. Seemed to help some, but then went back to how it was. Sluggish, don’t wanna go. Will have to hook it up to hp tuners and see what’s going on.

madmann26

iTrader: (7)

With your mods, the issue is the calc airmass fields under engine diag.

Nothing is going to fix it except a tune.

PS - I've been running SD for years. No issues. But SD won't fix your issues.

000martin

@madman
I believe you are right. It threw 8 different codes today:
02 codes- too rich bank 1 & 2
the MAF sensor codes are P0101-maf sensor performance, P0641-5 volt reference signal? , P0102 circuit low frequency
TPS codes- P2101 control module throttle actuator position
hell it even threw a pedal position sensor code
i hooked it up to a live scanner, on the TPS% it will NOT go higher than 33.2-33.9%. Something isn't letting me use but 1/3 throttle.

me and a buddy were checking it out on his scanner and he was wondering how it was even sitting there idling