when I leave in the morning my truck sounds like it has a rod knocking. It just started this morning was wondering if your trucks were doing the some thing. (the knock goes away about a 1/4 mile down the road) It has been down in the low 30s here recently.
Mods:
Maybe STOCK
"My lugnuts require more torque than your ricer is ever going to produce"
Sleep: That Stuff Is Overrated
"You don't care what it is, or who makes it, as long as they race it. You my friend are a true Gear Head!" (Drew Anderson)
Who's the real culprit of Obeisity: video games because their scared of physical activities, or Pillsbury for being so delicious?
Sounds like the dreaded cold start knock.
GM says its normal.....How many miles on your truck? 5.3, right?
2005 RCSB 4.8L TVS1900 9 psi
2005 ECSB 4.8L TVS1900 5 psi
That makes 9.6L @ 14psi
5.3, auto and i just truned 56k tonight
Mods:
Maybe STOCK
"My lugnuts require more torque than your ricer is ever going to produce"
Sleep: That Stuff Is Overrated
"You don't care what it is, or who makes it, as long as they race it. You my friend are a true Gear Head!" (Drew Anderson)
Who's the real culprit of Obeisity: video games because their scared of physical activities, or Pillsbury for being so delicious?
Hmmmm.
It sounds like cold start knock/piston slap. These motors are infamous for it, mine did it from day one....until it hit 80k....and that was all supercharged.
2005 RCSB 4.8L TVS1900 9 psi
2005 ECSB 4.8L TVS1900 5 psi
That makes 9.6L @ 14psi
All gen III engines have reported some kind of knock.Originally posted by 2ktukin20s@Feb 23 2004, 11:20 PM
I didn't post this but here's what happened to my truck about a month ago.
Everytime I got in my truck I had a terrible knock, I mean a noticalbe one, where ppl would look lol. It sounded like someone hitting my block with a hammer.
It continued to do this for about 3 days, everytime I'd start it up , the same thing as you, drive it for about 2mins or less than a mile and it would quit.
FIX for my engine: I changed the oil. I always use Mobil I and fram filters. It kind of seemed like the oil was being restricted somehow, mabye the filter was clogged or a passage was clogged.
It sounds funny, but mine has never knocked like this before and then I changed the oil, try that and definitely keep us updated, I'd like to know too.
This wasnt the normal cold start knock everyone has heard, mine was a loud ass hard tap, that was very noticable.
goodluck,
allen
Nelson Performance
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2005 RCSB 4.8L TVS1900 9 psi
2005 ECSB 4.8L TVS1900 5 psi
That makes 9.6L @ 14psi
Hahaha I got the same thing! I just turn up the radio.Originally posted by 2ktukin20s@Feb 23 2004, 11:20 PM
2006 Superior Blue Trailblazer SS AWD, Stock as a rock
Sold: 2002 GMC Sportside Denali front end with a 2002 LS1, FLT level 5, Yank 2600, Trick Turbo, T76, Nelson intercooler, 60LB injectors, Warbro fuel pump, Eaton locker, Magnaflow, 3.42, Nelson Performance Tuning (speed density).
Sold: 1981 GMC LB RC 1500 2002 4.8L 4L60E 12 bolt 3.73 Richmond Lock Right AC PS Nelson Performance tuning
Originally posted by GMCwantsLS1+Feb 24 2004, 02:21 PM--><div class='quotetop'>QUOTE(GMCwantsLS1 @ Feb 24 2004, 02:21 PM)</div><!--QuoteBegin-2ktukin20sHahaha I got the same thing! I just turn up the radio.[/b]@Feb 23 2004, 11:20 PM
Mods:
Maybe STOCK
"My lugnuts require more torque than your ricer is ever going to produce"
Sleep: That Stuff Is Overrated
"You don't care what it is, or who makes it, as long as they race it. You my friend are a true Gear Head!" (Drew Anderson)
Who's the real culprit of Obeisity: video games because their scared of physical activities, or Pillsbury for being so delicious?
I had this same problem with all the 5.3L we have here...pass 20K km they all start doing that kind of "uncharged lifter noise" for a while in the mornig and then in a minute or 2 it stops or start fading away.
Then the rest of the day it starts and no noise at all !!!!!!
The way I solve this problem is I use in normal 5.3L mineral 10w30 oil (perfromance 5.3L mines synthetic LOL) and change the oil every 3500K cause the trucks of the company works on harsh evyroments ( lot of dust form construction road and short trips)
As they reach the 20-25K each time I put a "Motor FLush" from TOP1 brand. with the old oil. Left it there for 10 minutes at idle and then dump all the oil and replace with fresh oil and new filter (balwind here) and none of the drivers have ever complaint again about the morning start noise.
Hope it helps.
Most of our 5.3L have reached and passed 250K km and have no issuess at all. Not even oil comsumption, some had develop an oil leak on the rear crank seal and some at the oil pan area.
The first is a Pain in the ass to change, but the second one is always some loose bolts. tight them and problem solve.
The only 5.3L I repair so far is mine, but was the highest milled engine past 400K and the piston came out with the ring lands broke. some pics if u want!!!!
But I guess I'm the only Ass hole that always live with the pedal to the metal
Hope this helps some one there!!!!!
My theory..Varnish....but it is not suppost to happend in synthetic oil, but happens too, so no clue !!!!
Not talking here about the piston slap some of those have at every start and the dealers here say it's normal. is other sound. Piston Slap is just like a turn on "knock" for a sec or less.
Need a Freakin' Roll Cage, and a Death Insurance
The 2 times i heard the noise it was a broken ring land. it'll still run ok, but when it's cold (before heat expansion) it'll knock pretty bad.
2013 2wd Z71 6.2 crew cab
Old Truck: '04 Chevy crew cab stroked/bored 6.0 to 408ci. forged internals, patriot 68cc stage 3 heads (11.1:1cr), comp 244/246 .600 115lsa cam, 3000 yank tc, built 4L60E, walbro 255, 60# mototron injectors, pacesetter lt's 4" single no-cat exhaust
best time 12.93 1/4 mi @ 103 in the turbo truck.
1968 Camaro Convertible, super sweet!
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