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Username Post: 5.3L Engine Issues        (Topic#350588)
Forum Newbie
Posts: 25

Loc: Chattanooga, TN
Reg: 10-22-12
04-11-18 04:17 PM - Post#2730735    

I've run into a few problems and I need some information and advice. I have a 2009 5.3L with AFM. I've had a check engine light on for a while telling me there is a misfire on cylinder two. After exhausting all the external possibilities, I decided to dig a little deeper and see what I could find. Not good.

Issue one, after I got the intake off, I noticed some oil around the intake gasket around most of the intakes. Is this normal? It uses a little oil, but the exhaust has never had a burnt oil smell.

Issue two, after I took the valley pan off, I found the source of the misfire. One the roller lifters froze and cut a groove into the camshaft lobe about a 1mm deep. I know that the camshaft and rollers need replaced, but can I get away with reusing the old camshaft bearings or do they need to be replaced with the camshaft.

At this point, I'm trying to decide if I want to button it back up and sell it, just deal with the camshaft issue, or just bite the bullet and rebuild the engine.

Any input is greatly appreciated.

Frequent Contributor
Posts: 2169

Loc: Lake George, NY
Reg: 11-11-15
04-11-18 06:32 PM - Post#2730750    
    In response to tendrew7

Couple of issues here, the metal from the cam damage may have gotten through the engine. Before going further I would pull the pan and look at some bearings. Rods and mains. If any damage is evident, the engine needs to come apart. If they look ok, pull the cam, you will see if the cam bearings look bad.

Valued Contributor
Posts: 3161

Age: 47
Loc: West Michigan
Reg: 02-18-12
04-14-18 08:00 PM - Post#2731001    
    In response to tendrew7

Can you buy a used engine?

99 K3500 RCLB

Posts: 16

Reg: 07-28-10
06-17-18 04:00 AM - Post#2737233    
    In response to tendrew7

I'm in a similar position, my 2007 1/2 5.3 with AFM has always burned oil and started tapping, but it's loud enough now that I can't sell it.

Im considering looking for a low mileage used motor to swap as a lot of these 5.3's ran fine...

How much do you like your truck otherwise? If you'd like something different, maybe that's reason enough to cut it loose... I wish I tried to sell mine back to Chevy before it got so loud.

Good luck.

Bad Bowtie 
Valued Contributor
Posts: 4789
Bad Bowtie
Age: 48
Loc: TX
Reg: 07-04-03
05-16-19 08:50 AM - Post#2766539    
    In response to patientasafarmer

What did you end up doing??

GMC. We are Professional Grade.

Frequent Contributor
Posts: 1244

Loc: Tennessee
Reg: 12-06-10
05-29-19 07:07 AM - Post#2767277    
    In response to Bad Bowtie

I have a 2014 5.3L and been doing research on this issue too. All the 2007 and later LSs have DOD / AFM cam and lifters that will eventually fail and lock-up after about 100,000+ miles causing a miss. Even before lifter failure the rings on those cylinders begin to gum-up and cause oil burning and consumption.

Though GM has been having these failures from the beginning, they have failed to do anything about it and are sticking to this bad design, won’t admit they were wrong. Government Motors go figure!

YouTube has several videos of guys replacing defective lifters to aftermarket non-DOD / AFM cam and lifters like pre-2007 engines. But you also have the re-program the computer to delete the DOD / AFM mode to avoid a miss indication.

As a preventive measure before a lifter fails, I had my computer re-programed to delete the DOD / AFM mode in hopes it will prevent further damage and failure. If one does fail, I’ll bite the bullet swap cam and lifters.

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