Im logging my maf sensor and the wide band reads really lean 15-16 till it gets hot then everything straightens out if i kill the engine for a min and start it back up it will do it again till i get going down the road and everything gets hot and all the numbers will start averaging back out and advice how to fix this problem thanks
Last edited by codykeen0923; 07-04-2021 at 09:00 PM.
Is your open loop table set to 1.00 for all cells above 130 degrees??
And are all your fuel trims and closed loop turned off?
2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.
If you don't post your tune and logs when you have questions you aren't helping yourself.
yes my eq ratio chart is set to 1 from 122 up and stft and ltft is disable and closed loop enable is maxed out
It's more helpful if you post your tune and logs too.
As well as everything done to the this vehicle.
2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.
If you don't post your tune and logs when you have questions you aren't helping yourself.
sorry new to this how do i post tune and i dont have a log right now but i can make one tomorrowOriginally Posted by 5FDP
I figured it out i posted the tune
5.3 bored to 5.7 flat top ls1 pistons
btr stage 4 truck cam
706 stock heads
3000 stall converter 4l60e transmission
36 lb pontiac gtp bosch injectors
stock truck intake and throttle body
long tube headers
The cylinder volume needs to change for the 5.7 engine size.
You offset data for the injectors looks wrong. I've never seen injector data like that. You're going to want to double check that. I have a stock GTP file and it does not jump up to 10+ at 14 volts.
2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.
If you don't post your tune and logs when you have questions you aren't helping yourself.
ok thanks i got the injector data from here from searching Bosch 0 280 155 868 and ill change the cylinder volume
Ill change cylinder volume and injector data if you have the correct stuff
Everything that 5FDP said is accurate. I'll also add that oxygen sensors aren't very accurate until they are warmed up. Does it run bad when the wideband is indicating this lean condition? What do your fuel trims look like? It could simply be that your fuel tables are a bit lean, and once it goes to closed loop, the PCM adds enough fuel to correct it.
Basically, we need a datalog in order to give you a direction.
[QUOTE=kevin87turbot;655827]Everything that 5FDP said is accurate. I'll also add that oxygen sensors aren't very accurate until they are warmed up. Does it run bad when the wideband is indicating this lean condition? What do your fuel trims look like? It could simply be that your fuel tables are a bit lean, and once it goes to closed loop, the PCM adds enough fuel to correct it.
Basically, we need a datalog in order to give you a direction.[/Q
yes my wideband indicates this condition and the truck is in open loop all the time the long and short term fuel trims are disabled im tuning the maf sensor it idles at 14.7 when i hit the gas at idle it leans and when im taking off then all those cells start leveling off perfect numbers but ill make a log and post it to show what im indicating maybe its normal i dont know but i did fix the problems with the injector offset and cylinder volume but im gonna go out and make a log and post it
97 white truck maf tune step 6.hpt
can you please look at this and see why my ltft are active in my scanner they have been off i made some changes now there on and i cant get them off
Last edited by codykeen0923; 07-05-2021 at 04:32 PM.
Disable the LTFT in the scanner, simple as that.
2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.
If you don't post your tune and logs when you have questions you aren't helping yourself.
ok ill disable them they were all reading at 0 now the long terms are reading dont know what thats about
white truck log 1.hplwhite truck log 2.hpl
here are the logs the first one you can see how things smooth out driving but in the second log when your taking off the deeper you lay into the throttle the leaner it will go but it doesnt do that when you get up and going good all the numbers level out if i add fuel on the bottom its rich when im driving down the road and hitting the same cells
Last edited by codykeen0923; 07-05-2021 at 05:59 PM.
does the maf have trouble down low and hitting the throttle in gear doesnt the ve table control idle and the mass airflow comes into affect up top bc i can dial the mass airflow in perfect driving around within 2 and 3% but as soon as i take off or rev the motor in gear its lean
well im having trouble with the low end of the maf curve starting out lean when taking off and then the same cells straighten out after driving for a min then start out the drive way it will be lean as hell across the board and then they recalculate while driving and will be within reason
If I were you I would tune the ve and the maf then enable dynamic factory mode. These ecu's when in blended mode use both ve and maf for idle and off idle to your dynamic setpoint of usually 4000rpm. From there it uses mostly filtered maf signal.
Tune the ve and maf. Enable dyanmic mode, make sure your injector data is right, and the trims should be happy after that.
2010 /2SS/Long Tubes/ Magnaflow axle back/LSA Conversion/ 2 bar OS running / Stock Blower Pulley...for now
I just focus on tuning the maf and ve individually and not worry about the driveability. I try to get good, clean logs of all the zones in the ve and maf. After, when my afr error is good, I re-enable dynamic and things usually are close and happy.
2010 /2SS/Long Tubes/ Magnaflow axle back/LSA Conversion/ 2 bar OS running / Stock Blower Pulley...for now
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