Do the pros of AFM delete outway negatives? If any? - 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 > Engine Tunes/Mods

Engine Tunes/Mods Performance Engine Tuning/Engine Modifications

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  #1  
Old 06-24-2018, 04:37 AM
Rain Rain is offline
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2007 GMC Envoy Denali
Liquid Silver Metallic 5.3L V8 4X4
Join Date: Jun 2018
Location: Indiana
Posts: 18
Do the pros of AFM delete outway negatives? If any?

I'm about 90% sure my Envoy has some lifter ticking going on. Literally just got this suv not too long ago. Drove fine, and then I got on it a little bit to 60 and then it started with a sound that is similar to the lifters from what I've found on youtube.

Here's a link to a video I took on youtube, it sounds like this at idle and increases with speed (wind gets kind of loud at the end):
https://www.youtube.com/watch?v=E9oFZtM-9RA

Oil pressure seems to be at about 40 on a cold start, 40 when driving, and about 25 at warm idle. Oil is about a quart low, it's at the second dot (don't worry, I'm topping it off tomorrow). Would that do anything to the pressure? Because I feel like it should be up a little bit. Or is 40 while driving (on the stock cluster gauge) where it should be?

If it is a collapsed lifter, I'm seriously looking into the AFM delete. I would prefer my vehicle to run as a V8 all the time. I found a post on LT1swap that covered in detail a good bit about the process. He also said he did ecm programming. Here's the link: http://www.lt1swap.com/afm_delete.htm

Think it would be worth it? Seems like a reasonably priced option since the AFM lifters are crazy expensive. Would also like to hear any advice anyone would have that has done this to their, or someone else vehicle before.
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  #2  
Old 07-05-2018, 01:29 PM
2006_Denali 2006_Denali is offline
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2006 GMC Envoy Denali
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The *only* upside to AFM is that it gives you an extra 0.5 to 1 mpg in steady-state highway driving. So loss of that 0.5 to 1 mpg is the only downside to deleting it, other than the extra parts/labor involved, and the need to tune the PCM for the new configuration.

The upside of deleting it is that since AFM turns a very robust engine into a very fragile one, deleting it can make a higher-mileage engine less prone to a serious failure. My 5.3 went down with a collapsed AFM lifter on the cylinder 7 exhaust valve while I was driving at 58 mph on cruise on a flat road and 75-degree temps...hardly adverse circumstances.

Having said that, I didn't do a full delete myself (yet); I just replaced the two AFM lifters on cylinder 7, the lifter tray, and the oil manifold, plus gaskets, and disabled AFM using the unplug-the-brake-booster-vacuum-sensor trick that works on 2006's. I'll eventually disable it permanently via a tune, and if another lifter collapses, I'll do a full delete. But the most common failure mode for AFM lifters is failure to pump back up after being commanded to collapse, so disabling the system at least makes that failure mode less likely.
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Old 07-11-2018, 05:27 PM
Rain Rain is offline
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2007 GMC Envoy Denali
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Quote:
Originally Posted by 2006_Denali View Post
The *only* upside to AFM is that it gives you an extra 0.5 to 1 mpg in steady-state highway driving. So loss of that 0.5 to 1 mpg is the only downside to deleting it, other than the extra parts/labor involved, and the need to tune the PCM for the new configuration.

The upside of deleting it is that since AFM turns a very robust engine into a very fragile one, deleting it can make a higher-mileage engine less prone to a serious failure. My 5.3 went down with a collapsed AFM lifter on the cylinder 7 exhaust valve while I was driving at 58 mph on cruise on a flat road and 75-degree temps...hardly adverse circumstances.

Having said that, I didn't do a full delete myself (yet); I just replaced the two AFM lifters on cylinder 7, the lifter tray, and the oil manifold, plus gaskets, and disabled AFM using the unplug-the-brake-booster-vacuum-sensor trick that works on 2006's. I'll eventually disable it permanently via a tune, and if another lifter collapses, I'll do a full delete. But the most common failure mode for AFM lifters is failure to pump back up after being commanded to collapse, so disabling the system at least makes that failure mode less likely.
I actually got the kit that Texas Speed makes. Comes with basically everything. Also got a new water pump, oil pump, plugs and wires. Having a guy I know that is a tech do the work for me. I wanted to do it, but I didn't want to have a month long project on something I want to drive and plus it's kind of nice knowing he knows what he's doing. Going to have another guy tune out the AFM for me for about 250. Not horrible considering that obd afm disabler is 200.

I just can't wait till I get it back lol. I drove it for like 2 days and it started ticking. It's really nice in every other aspect tho, and it was a good deal all things considered.
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  #4  
Old 07-11-2018, 05:30 PM
Rain Rain is offline
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2007 GMC Envoy Denali
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Can't understand why GM made AFM/DoD but the way I see it is it was just a marketing strategy for "fuel economy" and a side effect of that was them coming back for service more, due to the weird lifters failing. Which was a win-win for them at the time.
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