Cylinder deactivation technology (thoughts?)

I'm looking for a newer used truck. One thing I heard a little bit about was something called cylinder deactivation technology. The way I understand it is the truck only uses all cylinders when needed. When coasting and going down hill some cylinders are not used. These are things I can't verify, but things I've heard.

I was wondering if anyone knew anything else about cylinder deactivation technology like which years of silverados have CDT (Cylinder deactivation technology, or do all trucks of newer years have CDT or just some of the trucks? Is any performance lost with CDT and is it known for causing any type of problems?

You are basically correct, this is a fuel mileage issue. Google GM cylinder deactivation for the details.

I'm looking for a newer used truck. One thing I heard a little bit about was something called cylinder deactivation technology. The way I understand it is the truck only uses all cylinders when needed. When coasting and going down hill some cylinders are not used. These are things I can't verify, but things I've heard.

I was wondering if anyone knew anything else about cylinder deactivation technology like which years of silverados have CDT (Cylinder deactivation technology, or do all trucks of newer years have CDT or just some of the trucks? Is any performance lost with CDT and is it known for causing any type of problems?


I know of one person who has a new silverado 2010. the non 4wd vehicle gets 23 MPG. his toyota 4wd truck 2009 gets 15mpg.

he has had no problems yet !

Im not just saying this because im a chevy guy but in my experience the dod in the gm v8's are the best so far. The ford cam phasers are garbage and need replaced around 70-80k miles. Chrysler and gm use the lifters and this works good but in chryslers case the oil passages are too small and cooks the oil clogging it. I have seen no problems soo far with the 5.3 dod motors.

I have a 2007 Tahoe LTZ with the 5.3 with cylinder deactivation. It is as smooth as silk in operation, but I question the fuel mileage improvement. I get 17-18 mpg on the highway at 65-70mph. My previous vehicle was a 2003 Yukon with the 5.3 and no cylinder deactivation. It got 17-18 mpg at 65-70 mph. In my opinion, the idea sounds great, unfortunately, In my experience, the results are not there.

I have a 2007 Tahoe LTZ with the 5.3 with cylinder deactivation. It is as smooth as silk in operation, but I question the fuel mileage improvement. I get 17-18 mpg on the highway at 65-70mph. My previous vehicle was a 2003 Yukon with the 5.3 and no cylinder deactivation. It got 17-18 mpg at 65-70 mph. In my opinion, the idea sounds great, unfortunately, In my experience, the results are not there.

the 17-18 MPG on the hywy is normal on all the 1500 5.3L gas engines 4X4 truck /suv . with NO de-activation engine management.

you should be up around 20 MPG

well you still have to remember these are 6500lb+ vehicles so its not going to be night and day. Although My college instructor had a hybrid silverado for the asep class and there was a noticable difference.

GM's version is Active Fuel Management. As said they use lifters, but these lifters have a sort of solenoid...There have been a few cases where the lifter solenoids have failed, but not a common problem yet. If you don't want the AFM and don't want to dive into the work of tearing it all apart...having a tuner such as Black Bear Performance or Nelson Performance tune the AFM out.

I guess CDT, deactivates ignition timing, fuel, and compression!
A switch from V6 to V8, it demands on driver and how much HP is needed for the load at the time.

How much is the computer, if it go's bad?

I guess CDT, deactivates ignition timing, fuel, and compression!
A switch from V6 to V8, it demands on driver and how much HP is needed for the load at the time.

How much is the computer, if it go's bad?
GM's AFM deactivates 4 cylinders. For Chrysler I believe they deactivate 2 Cylinders at a time until it reaches 4 cylinder mode in the V8 models IIRC. I'm unfamiliar with Ford's DOD however.

dod on a 5.3 energizes a solinoid which detours oil flow form the lifters of the 4 cyclinders being shut off. They also cut the injectors and adjust timing to compensate for the lack of power strokes. Not all the complicated if you think about it. If there is a solinoid or lifter prob they are relativly easy to replace thanks to the dry intakes on these.

It sounds interesting, but I would rather use my 4-cylinder Tribute for fuel economy, and Jaguar for Horse power.

But you can have both!!!

If one go's bad, at least I got a spare!

i drove brand spanking new Tahoe with V8 and deactivation. hwy for 95% of the trip from Seattle to bend, OR, and back.

it did what, 16 something mpg? i think, i got it from 16.7 when rented, to 16.8 when returned.

my 2000 Silverado with straight V8 does 22mpg hwy.

i drove brand spanking new Tahoe with V8 and deactivation. hwy for 95% of the trip from Seattle to bend, OR, and back.

it did what, 16 something mpg? i think, i got it from 16.7 when rented, to 16.8 when returned.

my 2000 Silverado with straight V8 does 22mpg hwy.
If it was brand new with less than 10k miles then that is normal. The break-in period is always the worst. It will pick up after that.

And did you go by the DIC? The DIC is actually inaccurate 99% of the time. Hand calculating it will be more accurate.

And how many miles did you travel? in city? highway?

slo99sierra;6859088]If it was brand new with less than 10k miles then that is normal. The break-in period is always the worst. It will pick up after that.

REALLY? by 5 miles to a gallon guy expects it to be?

And did you go by the DIC? The DIC is actually inaccurate 99% of the time. Hand calculating it will be more accurate.

ok, let's set this straight. those cars have never even been rated for 22 mpg. wishful thinking and baloony from dealer or seller:

Chevrolet Silverado K15 4WD (http://www.fueleconomy.gov/feg/2008car1tablef.jsp?id=29773) 8 cyl, 6.2 L, Automatic 6-spd, FFV, Gasoline or E85
http://www.fueleconomy.gov/feg/photos/2010_Chevy_Silverado_Extended.jpg 13.3
http://www.fueleconomy.gov/feg/emissions/sm06e.gif
Gas12
city19
hwy$3309
E859
city13
hwy$3327</B>

Chevrolet Silverado K15 4WD (http://www.fueleconomy.gov/feg/2008car1tablef.jsp?id=29771) 8 cyl, 4.8 L, Automatic 4-spd, FFV, Gasoline or E85
http://www.fueleconomy.gov/feg/photos/2010_Chevy_Silverado_Extended.jpg 12.4
http://www.fueleconomy.gov/feg/emissions/sm06e.gif
Gas13
city18
hwy$3092
E8510
city13
hwy$3327</B>

2010 Chevrolet Silverado 15 Hybrid 4WD

Hybrid Vehicle
http://www.fueleconomy.gov/feg/images/greenTaxSmall.gif (http://www.fueleconomy.gov/feg/tax_hybrid.shtml)

Use Your Gas Prices &
Annual Miles (http://www.fueleconomy.gov/feg/2001customizef.jsp)

Switch Units:
Gallons/100 Miles (http://www.fueleconomy.gov/feg/2008car1tablef.jsp?si=gpm)
Liters/100 km (http://www.fueleconomy.gov/feg/2008car1tablef.jsp?si=true)
http://www.fueleconomy.gov/feg/photos/2010_Chevy_Silverado_Hybrid.jpg

http://www.fueleconomy.gov/feg/comparesbs.gif (http://www.fueleconomy.gov/feg/2008seleyear2f.jsp)

Estimated New EPA MPG http://www.fueleconomy.gov/feg/images/calculator/redInfo.gif (http://www.fueleconomy.gov/feg/ratings2008.shtml)New MPG tests are more realistic http://www.fueleconomy.gov/feg/images/calculator/info.gif (http://www.fueleconomy.gov/feg/ratings2008.shtml)
Regular Gasoline21
City
21
Combined
22
Hwy



and i bet you sweet bucks hybrid won't even do 22.

didn't i say it was 95% if not more hwy trip? around 700 plus miles, with them maybe 10 miles in Bend. --------

And how many miles did you travel? in city? highway

was it an awd tahoe?

slo99sierra;6859088]REALLY? by 5 miles to a gallon guy expects it to be?

ok, let's set this straight. those cars have never even been rated for 22 mpg. wishful thinking and baloony from dealer or seller:

Chevrolet Silverado K15 4WD (http://www.fueleconomy.gov/feg/2008car1tablef.jsp?id=29773) 8 cyl, 6.2 L, Automatic 6-spd, FFV, Gasoline or E85

http://www.fueleconomy.gov/feg/photos/2010_Chevy_Silverado_Extended.jpg 13.3

http://www.fueleconomy.gov/feg/emissions/sm06e.gif
Gas12
city19

hwy$3309

E859
city13

hwy$3327</B>


Chevrolet Silverado K15 4WD (http://www.fueleconomy.gov/feg/2008car1tablef.jsp?id=29771) 8 cyl, 4.8 L, Automatic 4-spd, FFV, Gasoline or E85

http://www.fueleconomy.gov/feg/photos/2010_Chevy_Silverado_Extended.jpg 12.4

http://www.fueleconomy.gov/feg/emissions/sm06e.gif
Gas13
city18

hwy$3092

E8510
city13

hwy$3327</B>


2010 Chevrolet Silverado 15 Hybrid 4WD


Hybrid Vehicle

http://www.fueleconomy.gov/feg/images/greenTaxSmall.gif (http://www.fueleconomy.gov/feg/tax_hybrid.shtml)

Use Your Gas Prices & (http://www.fueleconomy.gov/feg/2001customizef.jsp)
Annual Miles (http://www.fueleconomy.gov/feg/2001customizef.jsp)

Switch Units:
Gallons/100 Miles (http://www.fueleconomy.gov/feg/2008car1tablef.jsp?si=gpm)
Liters/100 km (http://www.fueleconomy.gov/feg/2008car1tablef.jsp?si=true)

http://www.fueleconomy.gov/feg/photos/2010_Chevy_Silverado_Hybrid.jpg


http://www.fueleconomy.gov/feg/comparesbs.gif (http://www.fueleconomy.gov/feg/2008seleyear2f.jsp)

Estimated New EPA MPG http://www.fueleconomy.gov/feg/images/calculator/redInfo.gif (http://www.fueleconomy.gov/feg/ratings2008.shtml)New MPG tests are more realistic http://www.fueleconomy.gov/feg/images/calculator/info.gif (http://www.fueleconomy.gov/feg/ratings2008.shtml)

Regular Gasoline21
City
21
Combined
22
Hwy





and i bet you sweet bucks hybrid won't even do 22.

didn't i say it was 95% if not more hwy trip? around 700 plus miles, with them maybe 10 miles in Bend. --------


Lol you picked all of the 4WD trucks, dude you're an idiot.

4WD trucks are going to get less than 21 hwy because of the extra drivetrain taxing the engine. It doesn't help any if you have a 4.8L in a Crew cab 4WD, a heavy truck with a weak engine = not good.

The current MPG ratings are actually EPA's doings, the Manufacturer will say it gets 17 city/22 hwy but EPA says the sticker needs to say 19 city/24 hwy.

Other people seem to think I should get 20mph mixed all day long in my regular cab 4.3 GMC truck. Truth is, you don't. Doesn't matter how you drive. I get consistent 17 mpg mixed, it's never seen 20+ mpg. The truck is too damn heavy for any decent mileage. But I'm not complaining being the truck has been good for me.

My aunt's 2010 Tahoe 2wd Gets 24 hwy (it counts since we all live in the middle of nowhere) with the AFM.

was it an awd tahoe?
There are no AWD Tahoes. The only ones on the platform with AWD are the Escalade ESV and the Yukon Denali. 4WD models exist in both Yukons and Tahoes though.

Maybe it needs a Tornado fuel saver, or missing some magenets!

.


my 2000 Silverado with straight V8 does 22mpg hwy.



your 2000 silverado 5.3L 4X4 gets 22 mpg ....

you tell alot of stories ..