Time for an AFM delete kit.
Call Texas Speed in Georgetown, TX.

 

X2

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X3...................

AFM truly stinks. I just sold my last vehicle with AFM (Cadillac EXT 6.2L) and I SWEAR TO GOD, I will never buy another AFM vehicle.

What I'd like to find is an '05 or '06 1500 LS with crazy-low miles and no rust. I'd pay full price.

 

X4... Get that crap out of your engine for good. Drive it another 200k.

 

Interesting…..I currently have my truck at the dealer for the same issue. 30k ago they installed all new lifters and a new cam. Heard a louder than usually ticking last week and made an appointment. They literally just called to tell me the lifters all need to be replaced again. What gives on these trucks?

 

BTW I deleted my AFM after the replacement 30k ago……..

 

Did you delete it with mechanical delete or just turn it off with a tune? Since you said you had it done at the dealer you most likely did not mechanically remove the AFM parts and instead just did it with a tune which is not enough.

 

Really? I just removed it with a tune and thought that was good enough. No?

 

Did you replace the plastic lifter retainer tray when you replaced the lifters? I would guess your lifter spun in the tray. I would bet your cam is toast also. If you ever have to get into a AFM/DOD engine because of the lifters you should just delete it all or else you will most likely be doing it all again soon.

 

The parts are hot garbage. Fully removing it is the only way to get some semblance of a reliable engine.

Simply shutting it off does nothing. My father's 2018 failed at roughly 50k and his was disabled since practically day one.

 

Just called Texas speed. 800 bucks for delete kit, no mods, just stock parts.
2015 5.3 silverado 87k miles
Will have to send out ecm to reflash it too.

 

I know a guy that had issues with his 2021 5.3 and the sticker on the window said the "DFM" was disabled due to chip shortage. This means the issue is not with the "system" itself, rather its defective lifters/parts themselves. This tells me that delete kits that use the same type of GM lifters will do the same thing.

 

This tells me that delete kits that use the same type of GM lifters will do the same thing.

The delete kits don't use the same type of GM lifters so no they won't.

 

Except the trucks that had the DFM disabled still have the shitty DFM/AFM lifters.

The delete kits are standard lifters and cam.

 

Possible intermittent lifter oil manifold?

This is the usual failure. The VLOM solenoids get out of time and cause the lifters to collapse or in your case, a bent pushrod. It is SOP to replace the VLOM and lifter trays whenever AFM repairs are made.

 

Yes, there are regular hydraulic lifters, which are pretty reliable for the non-afm cylinders, and then afm/dfm lifters, which can collapse on demand, so they don't open. The afm/dfm lifters are the ones that more commonly fail. Doing a delete switches the lifters to be all regular hydraulic lifters (which can still fail, but it's much more rare/unusual for them to).

 

Wondering if a crate pre-2007, non AFM engine can be married to newer trans and would be less expensive than a real AFM parts delete?

 

Short of smashing into the warehouse and stealing the crate engine, no.

 

Can it be done? Probably... with enough time, money, and expertise. But it can be a nightmare to swap to an engine from a different generation truck.

 

Do you guys think having a tune with these trucks could lend itself to the cause of the bent pushrods, lifters and cams? Maybe the AFM parts don‘t jive with with tuning these things?

 

No, unrelated.

 

A tune would have nothing to do with it. A tune (with AFM turned-off) can actually help, somewhat, in preventing lifter failures because the lifters are no longer locking/unlocking over and over again, which causes wear on the little keeper that locks the lifter in the collapsed position.

 

While I would agree with you the dealer says otherwise…..

 

Well I just heard from the dealer…..getting new cam, new pushrods, and new lifters. Hopefully I can get more than 30k out of it this time.

 

Enjoy having AFM a third time round lol

 

My son and I pulled that AFM crap off his 2015 5.3 Silverado. 37K on the clock and it crapped out with 1 bent push rod and a bad lifter. My son is diligent on maintenance and using the required oil so the problem didn't arise from lack of care. So cam, lifters and push rods replaced and flashed the ECM and the truck runs like it should have from the beginning.

 

Pushrods don't take kindly to 6,000+ rpms all the time.

 

Has anybody tried replacing the AMF lifter pushrods with Chrome Moly Pushrods?

 

what do you imagine would be the difference? generallly, the problem is the lifter that fails, and then that will sometimes cause the pushrod to bend. Putting in stronger pushrods won't help solve the problem.