AFM/DOD question - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 5.3L V8 Engine and Drivetrain > OEM Issues

OEM Issues Original Equipment Repairs and/or Problems

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  #1  
Old 01-31-2019, 08:59 PM
Carguy1985 Carguy1985 is offline
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2006 GMC Envoy Denali
Summit White 5.3L V8 2WD
Join Date: Feb 2018
Location: Bradenton
Posts: 37
AFM/DOD question

So my envoy is at around 106k. Still has plenty of power, rides and drives great. I noticed that when I am driving on highway the DOD kicks into 4cyl bc I hear the ton change and if I accelerate I hear the tons change back.

My question is when I am coasting after accelerating anywhere between 10-25 shortly after pedal isnít pressed for gas it starts to tick repeatedly. At first I thought it was an exhaust leak but realized it want. I read on here that it doesnít enable DOD when in 3rd fear so while it was doing it I shifted from d to 3 and it went away and never happened again.

It doesnít tick at idle like a collapsed stuck lifter, is there anything I can do on the cheap side first to test other than drive on 3 locally lol? I know you can program out DOD but Iíd hate to cause future issues since I know the DOD pistons have special lifters and the cam is not a standard cam. I consider my self slightly more mechanical than not but far from an expert mechanic.

My envoy is first experience with DOD so I donít know too much just on the mechanics of it with different lifters the VLoM, etc. honestly donít care for it that much, if I wanted better mpg I would have gotten a small suv with a 4 banger lol.
Has anyone tuned it out without issues? Has anyone fixed it without disabling dod or changing out lifters etc?

Any info would be greatly appreciated
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  #2  
Old 02-02-2019, 11:51 AM
mes882 mes882 is offline
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2007 GMC Envoy Denali
Dark Gray Metallic 5.3L V8 4X4
Join Date: Mar 2018
Location: waterloo, IA
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This device will keep it in v8 mode.

https://rangetechnology.com/
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  #3  
Old 02-03-2019, 08:28 AM
NJTB04 NJTB04 is offline
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2004 Chevy TrailBlazer LS
Pewter Metallic 4.2L I6 4X4
Join Date: Aug 2012
Location: Edison, NJ
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Great device, never heard of that before. Usually the PCM is sent out to disable the AFM.
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  #4  
Old 02-06-2019, 07:36 PM
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rcott01 rcott01 is offline
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2004 GMC Envoy SLT XL
Black 4.2L I6 4X4
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Location: Eaton, OH
Posts: 58
You can have it disabled in the tune , but eventually the lifters will fail and cause big issues. I bought a Saab 97x with the 5.3 really cheap because the lifters failed causing oil starvation and spun 2 rod bearings. If you are mechanically inclined and can do a cam swap, I would swap the cam, lifters, and valley cover. They sell dod delete kits but they are expensive. You can get a set of ls7 lifters for $100, gen 4 4.8 valley cover for $30 and a used stock 5.3 cam for $75. If you look around you might be able to find a deal like I got....ls2 cam, lifters, valve springs and keepers, pushrods, and ls2 valley cover from a 06 gto with 30,000 miles for $140....and a little bump in power.
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Old 02-09-2019, 01:03 AM
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Chevyguy982 Chevyguy982 is offline
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Did you need to have it tuned with the ls2 cam? Is the power increase noticeable? I’ve been wanting to swap the cam in my gto for a while now I can kill two birds with one stone although I would like something a little rowdier in the Envoy if I’m gonna do all that work decisions decisions lol
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Old 02-18-2019, 06:57 PM
06denaliman 06denaliman is online now
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2006 GMC TrailBlazer LS
Cranberry Red Metallic 5.3L V8 4X4
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Quote:
Originally Posted by Chevyguy982 View Post
Did you need to have it tuned with the ls2 cam? Is the power increase noticeable? Iíve been wanting to swap the cam in my gto for a while now I can kill two birds with one stone although I would like something a little rowdier in the Envoy if Iím gonna do all that work decisions decisions lol


I would assume you would tune it for the ls2 cam because if your getting rid of afm/dod you have to have that tuned out so might as well tune for the bigger cam too. Im in the same situation. I have 143,000 on my denali and i know eventually the dod lifters are going to be a problem. But at this point im going to wait for it to fail then deal with it then.


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  #7  
Old 02-19-2019, 04:39 PM
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rcott01 rcott01 is offline
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2004 GMC Envoy SLT XL
Black 4.2L I6 4X4
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My DOD wasn't active so I didn't have to get it tuned but I did. The guy who tuned it said that since the ls2 wasn't very radical that I would have been fine, but I wanted the speed limiter turned off and transmission tweaked. I did notice a pretty big gain in power across all rpms. I wanted a bigger cam, but didn't have a lot of cash at that time and needed to get it put back together quick. I found it lightly used and cheap that's why I ran the ls2. But I am very happy with it. I sounds stock, has a bump in power, and I average 18mpg around town when temperatures are above 35 degrees.
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Old 02-19-2019, 04:45 PM
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rcott01 rcott01 is offline
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2004 GMC Envoy SLT XL
Black 4.2L I6 4X4
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Location: Eaton, OH
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If it were mine I would remove the DOD hardware before it fails. Because when it does fail, a lot of times the crank and rods get chewed up or a rod gets thrown through the side of the block. Mine had 2 rods that spun the bearings and chewed about 3/8" out of the crank.....I replaced the whole engine. At the junkyard I go to i see a lot of the lh6 with a rod through the side of the block. Imo if you want to keep an aluminum block in it, fix it before it breaks.
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