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05-15-2013, 02:04 PM #11
I too have this noise on my high mileage 4.8. Thanks for all of the great comments. I am skeptical about using additives, but I have heard good things about Seafoam. This may be in the works soon for me.If you think you can do a thing or think you can't do a thing, you're right.--Henry Ford
05-15-2013, 03:58 PM #12
I have a 2002 2500 with 166,000 miles on it. I added a can of sea foam to the fuel tank. I could notice the closer I got home the better the truck was running. about a 25 mile ride. I would recommend sea foam to people. At least as a fuel additive. I haven't decided if I would add it to my oil before I change it.
05-15-2013, 06:12 PM #13~~~~~~~~~~~~~~~~~~~~~~~~~
Vanessa (Fife, WA)
2007 4x4 Silverado LT
6" Superlift / Leveling Kit / Superchip
MBRP Cat Back Performance Exhaust
35" Tires / 19" Wheels / Smittybilt Nerfs
Custom 2 Tone Leather Interior
1978 3/4 Ton K5 Blazer Monster Truck
8" suspension lift, 3" body lift
44" tires, 16.5" wheels
05-16-2013, 07:41 AM #14
05-16-2013, 01:45 PM #15
After talking with a few mechanics, it was not the oil pump as the oil pressure was fine. It turned out to be the oil filter. I was using an aftermarket oil filter, I think it was Deutsch or some kind of Champ filter.
To make a long story short, I switched to an AC Delco oil filter and the ticking went away.
Ever since then, I ONLY use OEM oil filters. Even when I had as Explorer, I used a Motorcraft oil filter. Seeing as the AC Delco oil filters are no more expensive than aftermarket oil filters, why not stick with OEM?
For your truck the filter is an AC Delco PF-46, make sure and avoid the E-core PF-46E.
I would also recommend using Mobil 1 5W-30.
As far as knocking is "normal" for Vortec 5.3L engines, that's a load of manure.
Dumping some snake oil into the gas tank is not going to cure any problem except maybe cleaning the fuel injectors.
A buddy of mine has a 2004 similar to your truck with ~185K on it and he said he's never had an issue with the engine knocking, and trust me he's not easy on his truck by any stretch.
2013 Silverado LTZ White Diamond Crew Cab
Advent OGM1 Navigation
Husky Liners GearBox Underseat Storage
EGR Rail Caps
K&N Air Filter
Flowsound 40 Muffler
Hypertech Max Energy Tune (only top end limiter removed and AFM disabled)
Chrome Tailgate Handle Cover
TonnoPro HF-155 Tonneau Cover
WeatherTech Front and Rear Splash Guards
Husky Liners X-Act Contour Floor Liners
WeatherTech Side Window Deflectors
05-16-2013, 02:12 PM #16
05-16-2013, 04:37 PM #17
IF on starting the engine and at idle in park the engine knocks ,,, then that is not a good sign ...
adding techron or marvel mystery oil to the fuel cleans the injectors and reduces carbon in the combustion chamber especially if the injectors are not working correctly . this is used to reduce the knock that GM says increases this noise problem.
05-16-2013, 06:52 PM #18
05-16-2013, 07:47 PM #19
05-16-2013, 08:33 PM #20
My 2010 started to have a Lifter knock! Under warranty and the Dealer replaced all lifters. No more dry starts for me! According to shop manager (a friend of mine), this is common with the 5.3's. If you are having a deeper knock, a rod bearing replacement may be required! No rebuild, easy to do. I do them @ work quiet often on Cat Diesel engines.2010 GMC SIERRA CREW CAB (Silver) 4x4, ReadyLift 2.5" Level Kit, 305/60/18 Dick Cepek Mud Country, Go Rhino Nerf Bars, Husky Liners front and rear, Bushwacker Bed Rail Caps, Custom tuned. 4:11's
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