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Old 11-24-2013, 06:23 PM   #1
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Silverado owners, help!

We just bought a 09 Grand Surveyor. Loaded we will be around 6000 lbs. The previous owner towed with a Mercury SUV v8.
I'm looking for used Silverados and Ecoboost Fords.
Tell me about motors, I'm looking at a 07 with a 5.3 OHV 16V FFV motor.
I've talked with a guy I know who has an 09 and he's telling me he's getting 20 plus mpg highway (not towing) and high teens around town. His is the motor that adjusts how many cyls are active to give the better fuel economy. Ideally I would like this motor as the truck will be my daily driver and I need to get the best possible mpg.
Whats this motor called?
What year did it become an option in the Silverado?

Thanks
Lane
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Old 11-24-2013, 06:48 PM   #2
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I think any of the 5.3s will suit your purpose; I just got rid of a 1999 Silverado with 184,000 miles on it and it still got at least 16 mpg in town and 19-20 highway driving 70 mph, towing 6500# tt was 8 1/2 to 10 mpg
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Old 11-24-2013, 07:26 PM   #3
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Your referring to the Chevy 5.3L with AFM or active fuel management. It will shut down from 8cyl to 4 during light driving. It will never do this while towing however since in tow haul mode it is overridden. This is a good thing since in in my opinion the whole AFM system sucks. I have a 2011 Silverado and love my truck but despise the AFM. Do some research and you will find numerous owners (including me) buy programmers specifically to turn off the AFM. The reason is that the 5.3L has been prone to use oil as a result of the system. No performance problems but I have been down as much as 1.5 quarts when I monitored between 5000 mile oil changes. I get 16.5 in the city and between 9-12 while towing my 5000# TT. All the 2014 engines are new this year for Chevy/GMC. I will upgrade at some point but to the 6.2L with the max trailer option and 3.73 gears. Happy hunting.
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Old 11-24-2013, 07:27 PM   #4
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I just traded in my 2008 GMC Sierra 1500 for 2013 Silverado 1500 this summer. Both had a 5.3 Active Fuel Management engine that did 16 mpg town and 20 hwy not pulling. The GMC pulled my 7000 lb TT with 8 mpg and the Silverado does 9 mpg. The tow rating went from 7800lb to 9500lb. Both trucks pulled my TT good enough but haven't been in the mountains yet. You should be good with the 5.3lt and a 3.42 or 3.73 rear end.
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Old 11-24-2013, 08:19 PM   #5
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ecoboost fords are new and with all new things give them a year or 2 work them out "ecoboost" is the tree hugger word for turbocharged by the way. the 5.3 or vortec 5300 was introduced in the 99/00 model year 1/2 ton trucks and large suvs. this is been proven to be a reliable motor up and beyond 200k miles. we have a 00 Yukon and pull a 25rr tow hauler with 2 bikes in it close to 7000 pounds loaded and it pulls just fine average 10mpg. 3.73 rear gear ratio. and unloaded the wife can get 18 to 20 tooling around .
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Old 11-24-2013, 08:57 PM   #6
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The funny thing about AFM on the 5.3 is that almost everyone I have seen that has disabled it, myself included, get better fuel economy on the highway. I dropped a little on my city MPG, and even more so when I went with bigger tires, but overall, I'm still doing better than I was when I had AFM... and I don't have the annoying lag when I stomp it. If you do get a 5.3 with AFM, a tuner is a must IMO. Will make driving and towing more enjoyable.
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Old 11-24-2013, 08:59 PM   #7
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Quote:
Originally Posted by mfdrookie516 View Post
The funny thing about AFM on the 5.3 is that almost everyone I have seen that has disabled it, myself included, get better fuel economy on the highway. I dropped a little on my city MPG, and even more so when I went with bigger tires, but overall, I'm still doing better than I was when I had AFM... and I don't have the annoying lag when I stomp it. If you do get a 5.3 with AFM, a tuner is a must IMO. Will make driving and towing more enjoyable.
If you buy the AFM chevy and the tuner to disable the AFM, would you not be better off buying something else?

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Old 11-24-2013, 09:10 PM   #8
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Well, it's not really an option. All 5.3's come with AFM these days... and the tuner can do a LOT more than disable AFM (unless you buy something like the range afm delete).
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Old 11-24-2013, 09:21 PM   #9
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The funny thing about AFM on the 5.3 is that almost everyone I have seen that has disabled it, myself included, get better fuel economy on the highway. ... and I don't have the annoying lag when I stomp it.
I'm going to have to say that it's all in the way they programmed it. I'm willing to bet that, at highway speed, the wind drag and other factors make having less horsepower detrimental to fuel efficiency and their programming doesn't take that into consideration. I know I had a Monte Carlo with a 6 cyl that whipped my 4 cyl S-10 in mileage on the highway. Below 55, I'm sure it would be another story...same thing with these trucks running on 4 instead of 8. If you were to edit the programming to raise the cylinder cut out when above a certain speed, it might give the best of both worlds..not even sure if that's possible though.

As to the lag, the only experience I have with it is on the Camaro. I've got a 2010 SS. Even though they were both 6.2L engines, the different transmissions got different motors. My 6 speed has an LS3 without the AFM, the automatic cars got the L99 with AFM. I drove one of the L99 cars and the only way I could tell it switched was the exhaust note changed slightly. No lag at all. Now...your lag could be caused by transmission programming and torque converter lock up parameters, witch could very well be different on a truck.
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Old 11-24-2013, 09:49 PM   #10
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Quote:
Originally Posted by mfdrookie516 View Post
The funny thing about AFM on the 5.3 is that almost everyone I have seen that has disabled it, myself included, get better fuel economy on the highway. I dropped a little on my city MPG, and even more so when I went with bigger tires, but overall, I'm still doing better than I was when I had AFM... and I don't have the annoying lag when I stomp it. If you do get a 5.3 with AFM, a tuner is a must IMO. Will make driving and towing more enjoyable.
I have watched my DIC in the readout on instant fuel economy mode that tells you if you are in V4 or V8. It doesn't hold long in V4. Just a fair touch on the gas peddle and your in V8. So 'big' deal on the AFM.
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