Cheap DOD/AFM delete gone wrong

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Dec 17, 2024 | 08:15 AM

zapp168

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From: Mass

Cheap DOD/AFM delete gone wrong

5.3 with AFM swapped into a car. I removed the VLOM and blocked the oil passages, installed a regular valley tray and an LS1 intake. Installed the engine and it fired up and ran good.....for a time. Now I get random valves not working so I will randomly get popping out the intake (exh valve not opening) , or huge vacuum spike (int valve not opening). My thought was that if there was no VLOM supplying oil pressure to release the locking pins that the lifter would just function as a normal lifter, this does not seem to be the case.
Any thoughts?
Thanks!

Last edited by zapp168; Dec 18, 2024 at 07:45 AM.

Dec 17, 2024 | 09:20 AM

01CamaroSSTx

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From: Conroe, Texas

Yeah I'm pretty certain you should've replaced the timing set, camshaft, lifters and trays on this.

Dec 17, 2024 | 10:16 AM

zapp168

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From: Mass

I know that would have worked, I am more questioning what is going on with what I did. If I had simply unplugged the VLOM the DOD would have stopped working and the engine would have ran normally.

Dec 17, 2024 | 12:05 PM

Ls7colorado

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Since when did any gen 3 engine have Afm/DOD?

Dec 17, 2024 | 03:13 PM

G Atsma

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From: Central Cal.

Quote:

Originally Posted by Ls7colorado

Since when did ANY gen 3 engine have AFM/DOD?

Since they NEVER did.... LM4 especially did not have DOD/AFM

Dec 17, 2024 | 04:54 PM

the_merv

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Yea that's definitely not an LM4, they are a Gen III Aluminum 5.3l.

Dec 17, 2024 | 06:31 PM

CattleAc

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I thought I was slipping when I read "2005 LM4 5.3 with AFM" at first...guess I'm not the only one...

Anyway, I'm curious to find out what he really has...

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Dec 19, 2024 | 09:27 AM

zapp168

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From: Mass

Ah yes LS1tech...I remember this place now. Anyway I solved the issue and it can be done without replacing the cam, lifters and trays.

Dec 19, 2024 | 12:46 PM

#10

dixiebandit69

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From: Texas

Quote:

Originally Posted by zapp168

Ah yes LS1tech...I remember this place now. Anyway I solved the issue and it can be done without replacing the cam, lifters and trays.

So... What was it?

Dec 19, 2024 | 12:50 PM

#11

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From: Alaska

Quote:

Originally Posted by zapp168

Ah yes LS1tech...I remember this place now.
.

.
. Thanks for ( almost ) sharing your helpful information.
.

Dec 19, 2024 | 04:04 PM

#12

Che70velle

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Quote:

Originally Posted by zapp168

Ah yes LS1tech...I remember this place now. Anyway I solved the issue and it can be done without replacing the cam, lifters and trays.

LOL. These guys simply brought up that perhaps you might not have an LM4….I was actually proud of them this time. They were taking it easy and wondering what engine you have. I am inquisitive myself as to what your working on, and how you came about making the repairs.

Dec 20, 2024 | 07:33 AM

#13

the_merv

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From: The Beach...

Maybe he is keeping it a secret until Cristmas and giving us his gift of that mystery Engine..

Dec 21, 2024 | 01:44 PM

#14

dixiebandit69

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From: Texas

I guarantee you it was something really stupid, and he's embarrassed to say what it was.

Dec 23, 2024 | 03:09 AM

#15

aprilsfool

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Quote:

Originally Posted by zapp168

Ah yes LS1tech...I remember this place now. Anyway I solved the issue and it can be done without replacing the cam, lifters and trays.

Interestingly, it can be asserted that my posterior possesses the unusual ability to engage in the act of chewing bubble gum. This statement serves as a lighthearted reminder of the unexpected capabilities that can exist in various contexts.