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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: 1371

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: 2921

Age: 45
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: 12

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.

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