08 tahoe with 102 k miles and Afm

[iamdub]

I recently picked up an '09 Tahoe with 92,000 miles and I'm not sure what route I'm going. Probably going to disable it with HP Tuners and tune it to regain the MPG loss.

Maaaaiiiin, shooooo... If I had HPT there'd be no "probably" to it. It'd be disabled and tuned as soon as I got it home.

 

[Scottd104]

Thanks so much for the input guys! I picked up the diablo spirit, and its already in the truck, The carfax i ran before i bought it showed a very good maintenance record so im just going to keep up with it.

 

[BG1988]

Right.

Sadly, this defeats the purpose of AFM which is to reduce the consumption of fossil fuels and operating costs for the end user. Replacing oil and filters prematurely is a waste of oil and filters and labor money for those that pay to have their oil changed. So, you're spending more money in hopes that a system that's supposed to save you money doesn't fail and cost you hundreds of times what that system could ever keep in your wallet.

Scott, I would at least disable it with a tune or Range device and keep clean oil in it to lessen your chances of an AFM failure. You won't miss it in the least. As the others said, change your oil frequently and use quality oil and filters (NO ORANGE FRAM). I recommend running a top name synthetic such as Mobil1, Quaker State, Pennzoil, etc. for a while to clean out what may be there from the previous owner(s). After a 3-4 changes of consistent used oil color, you can stick with this oil or switch to a quality blend or conventional oil if the full synthetic is not in your budget. The important thing is to change it before it gets really dark. Keep in mind the fresh synthetic oil may get dark quickly. This is an indication that it's detergent additives are effectively cleaning crud from the engine.

102K miles is low mileage on an LS engine so it should have a lot of life left in it. If it were mine and I planned to keep it for a long time and if it was in my budget, I'd delete the AFM altogether so it'd never be a concern.

I'd have to say that Paw Paw (@89Suburban's) experience with having AFM for 311K miles is an exception to the norm, but impressive nonetheless.

larger high capacity oil filter from wix

 

[Plimbob]

Hey Scott, I have an 07 with 265,000 on it. I have had it disabled since about 150k and I use the range unit. If you go with the Range unit make sure you unplug it and let it run for a few minutes and replug it in about once every week or two. The problem with the Range I have is it will quite working once in a while.

Before I started using the Range the oil consumption would be about 1.5 quarts between every oil change (3,000). With the range in place its about .5 to .75 quart. Which isn't bad for having 265k. I sue Valvoline Maxlife 5-30 and either purolator one or the high end wix filters.

If I decide to keep this unit, I am going to have it tuned and removed.

Tim

 

[FrankU]

Wix oil filter number please.

 

[swathdiver]

I just picked up a 08 tahoe z71 with 102 k miles, Runs great no issues should i disable Afm now to try and prevent and issues down the road ?

Thanks for the help

Try to determine what kind of oil was used in it and if the crankcase and or valve covers are sludged up inside. Reason being, we've seen so many guys on this forum but a new used truck and change the oil to synthetic. The synthetic cleans out all the sludge and causes all kinds of problems. Go slow.

 

[Plimbob]

Frank - the Wix # 57060XP

 

[91RS]

Right.

Sadly, this defeats the purpose of AFM which is to reduce the consumption of fossil fuels and operating costs for the end user. Replacing oil and filters prematurely is a waste of oil and filters and labor money for those that pay to have their oil changed. So, you're spending more money in hopes that a system that's supposed to save you money doesn't fail and cost you hundreds of times what that system could ever keep in your wallet.

I think it was really more to do with emissions regulations than trying to reduce consumption for the end user.

I'd have to say that Paw Paw (@89Suburban's) experience with having AFM for 311K miles is an exception to the norm, but impressive nonetheless.

Indeed. My uncle bought a 2008 Silverado brand new and we changed the oil like clockwork every 5k miles and his started consuming at about 80k miles and now it takes adding quarts to make it through an oil change interval and last week cylinder 7 started misfiring because the spark plug was oil fouled. We did get 45k miles out of the stock 20" Eagle LS2's rotating the tires every 5k miles and keeping the alignment perfect.

 

[iamdub]

I think it was really more to do with emissions regulations than trying to reduce consumption for the end user.

Meh, same thing. Reducing how much fuel an engine takes in will reduce how much emissions comes out of it.

Indeed. My uncle bought a 2008 Silverado brand new and we changed the oil like clockwork every 5k miles and his started consuming at about 80k miles and now it takes adding quarts to make it through an oil change interval and last week cylinder 7 started misfiring because the spark plug was oil fouled. We did get 45k miles out of the stock 20" Eagle LS2's rotating the tires every 5k miles and keeping the alignment perfect.

Word. I stick to a 5K service interval with oil changes and tire rotations and study the tread wear to see if any alignment and/or pressure adjustments are needed. Your uncle's truck had the classic experience of the carbon buildup from the oil consumption sticking the rings in the rear cylinder(s) and causing accelerated wear. It's a shame. Had he replaced the valve cover with the newer design and disabled AFM (if equipped) and topped it off with a atch can for good measure, he likely wouldn't have had any issues.

 

[Scottd104]

Thanks for the replys guys, What an awsome forum!!