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

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Old 01-31-2019, 09:59 PM
Carguy1985 Carguy1985 is offline
Junior Member
2006 GMC Envoy Denali
Summit White 5.3L V8 2WD
Join Date: Feb 2018
Location: Bradenton
Posts: 33
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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Old 02-02-2019, 12:51 PM
mes882 mes882 is offline
Junior Member
2007 GMC Envoy Denali
Dark Gray Metallic 5.3L V8 4X4
Join Date: Mar 2018
Location: waterloo, IA
Posts: 27
This device will keep it in v8 mode.
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Old 02-03-2019, 09:28 AM
NJTB04 NJTB04 is offline
2004 Chevy TrailBlazer LS
Pewter Metallic 4.2L I6 4X4
Join Date: Aug 2012
Location: Edison, NJ
Posts: 252
Great device, never heard of that before. Usually the PCM is sent out to disable the AFM.
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Old 02-06-2019, 08:36 PM
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rcott01 rcott01 is offline
Junior Member
2004 GMC Envoy SLT XL
Black 4.2L I6 4X4
Join Date: Feb 2016
Location: Eaton, OH
Posts: 34
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, 02:03 AM
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Chevyguy982 Chevyguy982 is offline
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Join Date: Feb 2019
Posts: 1
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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