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Repair Active Fuel management for just a few pennies DIY fix.

bg1988

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bg1988 Enthusiast

bg1988

Posted
Posted

This is not DIY in Oregon or New Jersey ..    haha  :rollin:

 

 

GAS QUALITY effects on how your  AFM works 

 

garbage GAS  fudges up the ECM  and it will rapidly shift between v4 and v8 mode causing damage to the system...or excessive wear and tear...

 

if you all ready have "excessive wear and tear"  it's too late...

 

Also your transmission will be searching for gears less often as well using 91/93 oct..

you get to stay in a higher gear longer 

 

 

 

 

i have tested varies gas station brands and octanes as well.. i have came to the conclusion that these two BRANDS of fuel WORK the BEST!!  on AFM engines..

 

 

 

Chevron/Texaco/CalTex

91 or 93 Octane 

 and

Mobil/Exxon  

91 or 93 Octane 

 

WILL work the BEST with the AFM system  both brands are tied #1 spot for a fully functional AFM system..

 

 

brands that cause the excessive  rapid shifting or dysfunctional/ non-functional AFM system include

 

using 91oct

 

Shell 

Arco/BP  

Marathon/USA gas

[Insert Name of your Cheap Gas Station Here]

Bob2C Enthusiast

Bob2C

Posted
Posted

Interesting you say that. I did away with AFM using the Range device.. Let me tell you the truck is more responsive, but back to this topic. I just filled up with BJ's gas (87)and it runs like crap.  Exxon made it run smoother on 87. I will try 91 Exxon after I run through the crap I have in there.

tbarn Senior Enthusiast

tbarn

Posted
Posted

Between my '14, '15 and '18, I've run Mobil, Shell, Kwik Trip, Casey's BP and probably more. All 87 octane. All three trucks ran/run perfectly.

Colossus Senior Enthusiast

Colossus

Posted
Posted

The Costco 91 octane has done will thus far.  It is Top tier as well. 

swathdiver Senior Enthusiast

swathdiver

Posted
Posted
1 hour ago, tbarn said:

Between my '14, '15 and '18, I've run Mobil, Shell, Kwik Trip, Casey's BP and probably more. All 87 octane. All three trucks ran/run perfectly.

The DI motors seem less influenced by lower quality fuels.  Besides, the L83 makes a lot more horsepower per cylinder compared with the Gen IV 5.3s and so can run in AFM mode about 50% of the time whereas the older generation was about 10%.  4-5 horsepower per cylinder difference is a lot.  Even more torque.

flyingfool Senior Enthusiast

flyingfool

Posted
Posted

Techron Gas is gold.. I use it in dirtbikes, cause the additives in the fuel last forever. I can fill up a bike tank with 91 Techron, 6-7 months later its still good and clear, not oxidized or yellowing into shellac. TEchron #1!!!

Colossus Senior Enthusiast

Colossus

Posted
Posted

Yes.  Techron is some of the best fuel system cleaner additives out there. 

bg1988 Enthusiast

bg1988

Posted
  • Author
Posted

the proof is in the gas mileage  I wanted a SUV but also wanted good MPG ,  hitting over 28.9MPG with the 6.0L (W/Hybrid Module) ...

 

 AFM works all the way upto 1900RPM or 80MPH  that is how I get the good MPG. with the good fuel  and octane..

 

 

Small cars are pretty useless where i live  since our speed limits are very high and if you get hit at 45 -60MPH your dead in a car.. or hurt pretty bad aka: a vegetable.  I have seen some pretty nasty crashes  like a 1996 tahoe hit a  1994 honda accord  the people in the accord got ejected.(dead).  they were hit at 55MPH.. T-Boned  they did lower the speed limit to 45mph  afterwards  but tooo late

 

also btw the tahoe just need a new front clip and it was ready to hit the road again 

flyingfool Senior Enthusiast

flyingfool

Posted
Posted

octane definatly improves mpg, on our truck I've found no gain after 89 octane, no mpg improvements with 91 octane .  87 is horrible milage 12mpg

sefiroxx Enthusiast

sefiroxx

Posted
Posted

Mfg set tuning curves per usage, buyer, intent. So, staying at the peak of the curve (ie 87-89) allows for max mpg.

But when you get away from the peak, things can get iffy and requires manual adjustments or parts upgrade.

On my Cadillacs, we ran a number of long term tests at various octanes with and without simple adjustments (ie timing). But in the end, the best $/mile was the spec of mfg. (Ie spec at 91, but 89 or 87 would have a mpg drop that cost more than the savings on price per gallon.

carnau Enthusiast

carnau

Posted
Posted
On 7/1/2019 at 11:03 PM, tbarn said:

Between my '14, '15 and '18, I've run Mobil, Shell, Kwik Trip, Casey's BP and probably more. All 87 octane. All three trucks ran/run perfectly.

You have not had any injector problems? That's the only issue we ever see with 14- 19 trucks. It's not the fuel you use, but the placement of the injector.

tbarn Senior Enthusiast

tbarn

Posted
Posted

No injector issues. Been retired for a year now but saw more issues with 6.2 injectors for some reason. My  trucks were all 5.3's.

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