Colorado 5.3 trying to correct MAF

[Carp0331]

I have an 09 Colorado stock 5.3. Volant intake and exhaust. Replaced the MAF but still get a ton of bog and delayed throttle under 3k. In straight VE without the MAF plugged up it drives great. I'm assuming there is a design issue with the Volant as I'm not getting any Codes other than rear O2 due to the HF Cats. LTFT are in the -11 to -14 range mostly. I've included a revised tune that I have not loaded yet. I'm new to this so please let me know if I'm doing something wrong.

Pulled the MAF Down below 11k HZ and added above it to bring it back to near stock in attempt to fix the ltft and bog. Also need to turn the MIL off the the Rear O2s.

Colorado 5.3.hplJosh Carpenter 2009 Avalanche A6 6.2L 216-228-112 50lb inj BIG MAF LTH 4.10 PG tune 6.hpt

[DanN]

Do you have the tune that corresponds to the log you posted?

[Carp0331]

stock tune for logcolorado 5.3 stock.hptcolorado 5.3 stock.hpt

[Cringer]

I have an 09 Colorado stock 5.3. Volant intake and exhaust. Replaced the MAF but still get a ton of bog and delayed throttle under 3k. In straight VE without the MAF plugged up it drives great. I'm assuming there is a design issue with the Volant as I'm not getting any Codes other than rear O2 due to the HF Cats. LTFT are in the -11 to -14 range mostly. I've included a revised tune that I have not loaded yet. I'm new to this so please let me know if I'm doing something wrong.

Pulled the MAF Down below 11k HZ and added above it to bring it back to near stock in attempt to fix the ltft and bog. Also need to turn the MIL off the the Rear O2s.

Colorado 5.3.hplJosh Carpenter 2009 Avalanche A6 6.2L 216-228-112 50lb inj BIG MAF LTH 4.10 PG tune 6.hpt

You uploaded mismatched log and tune files? Please don't do that. Try this, and clear your DTC's.
Josh Carpenter 2009 Avalanche A6 6.2L 216-228-112 50lb inj BIG MAF LTH 4.10 PG tune 6 - cringer.hpt

[Carp0331]

my fault i didnt realize that it grabbed my tune off my avalanche that patg did. i'm not using that tune. below is what i modified to try and correct the MAF.


2009 Colorado ZQ8 5.3 JC.hpt

[Carp0331]

I updated the MAF to reduce the flow by 10% and the LTFT came down. I also increased the timing. Runs alot better. Still bogs a little on take off but not near as bad. I still need to play with it. Crank timing is too high and i need to dial in the timing but its on 87 octane and trying to play it safe Colorado 5.3 After Tune 1 LOG.hpl2009 Colorado ZQ8 5.3 JC REV 1.hpt

[Cringer]

I updated the MAF to reduce the flow by 10% and the LTFT came down. I also increased the timing. Runs alot better. Still bogs a little on take off but not near as bad. I still need to play with it. Crank timing is too high and i need to dial in the timing but its on 87 octane and trying to play it safe Colorado 5.3 After Tune 1 LOG.hpl2009 Colorado ZQ8 5.3 JC REV 1.hpt

These VVE edits should help throttle response.
2009 Colorado ZQ8 5.3 JC REV 1 - cringer vve help.hpt

[Carp0331]

Thank you!

[Carp0331]

i've played with the maf some and to me fuel trims look good now.


2009 Colorado ZQ8 5.3 JC REV 4- cringer vve help.hptColorado 5.3 After Tune 3 LOG.hpl