BB tune MAS question

[ktmhans]

So i did the auto cal. Stock stock the truck got 17.1 mpg on the highway. I have since installed the aem cai. On a trip to nc driving all highway i was only able to muster up 16.6mpg. Very disapointing. I had the stock intake shipped down to me while i was down there and installed it. 16.6 mpg on the way home too. Power was actually better with the aem and i did the scan with the aem installed. These mpgs sucked. I would have thought. i could have pulled a good 20 on an all highway trip.
Since i have had the tahoe it has idled lumpy at a stop sign.

When doing the scan justin asked me to do it a second time. The mas was ready 15% high on the low and 10% low on the high. Ive cleaned it twice now with a full can of cleaner. Is this something that could cause this? The pore mpg/idle. Is it worth another $100+ bucks to replace?

I dont know enough about what it does

 

[Rivieraracing]

If it's not reading right and it's clean, then I'd lean towards getting a new one!! It doesn't take much to mess one of those up and it really affects how the truck runs!! Run it by Justin and see what he thinks!!

 

[M3PO]

Maybe use a few road trips/tanks of gas to draw your conclusion.
I have been down to our lake house three times this summer, taking the same route, usually running about the same speeds, and carrying the same load. The first two trips: I was getting high 16s low 17s. I just went for a third trip last weekend, and I could barley get 16 mpg, there and home.
Whats the difference? Is what I was wondering, I used gas from two different stations, since one way is a half tank. I checked the tires, the rears needed 2 lbs (which can make a difference), there was no big time wind or traffic. In the end, I don't know. Driving around town now that I am back, I look to be getting closer to 16.5 city/highway. So it was 1-2 psi in two tires, or just things I can't see, that is why I suggest taking another trip or two before you go replacing parts. Just my opinion.

Good luck.

oh yeah, my MPGs are out of a AWD 6.0 Denali gas hog, so they weren't meant to be compared, only show the differences I was getting.

 

[Splatmaster527]

A MAS is like $20 once you get your core back...
Just go get a new one

 

[ktmhans]

Hows that?

A MAS is like $20 once you get your core back...
Just go get a new one

 

[Splatmaster527]

I just bought one like a week ago...
Its like $70 and when you bring in your old one (core) or bring it with you when you buy a new one you get like $50 buck back so in the end its about $20

 

[ktmhans]

I just bought one like a week ago...
Its like $70 and when you bring in your old one (core) or bring it with you when you buy a new one you get like $50 buck back so in the end its about $20

Where was that?

 

[Splatmaster527]

Autozone

Should be about the same price at most auto parts stores

 

[ktmhans]

Autozone

Should be about the same price at most auto parts stores

Really. Thanks ill look into it today.

 

[ktmhans]

Picked up a new mas yesterday and even though i havent checked the #'s it sure seams its close to 2-3 mpgs better. Truck seams to run smoother as well. Time will tell though.