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#1
11-09-2010, 08:38 AM
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'04 Silverado valve clatter?
Now that it's cold, the 5.3L in my 04 Silverado is clattering to beat the band when I start it in the morning. It continues to clatter until I drive it a mile or two. Oil pressure is good, 5W30 oil, runs fine, 121K miles. I bought it new and it's been maintained. It sounds like valve clatter, and it's LOUD.
Any insight? Thanks!
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I could explain all this to the girl at the parts store, but she'd probably call the asylum. White '67 LeMans 407/TH350/Ford 3.89... RIP Red '67 LeMans. 407/TH400/Ford 3.25 |
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#2
11-09-2010, 08:52 AM
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It's probably piston slap. Lots of history there with the LS truck motors. As long as oil consumption doesn't go up dramatically, get used to it.
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'04 GTO Yellow Jacket, A4, Kooks, CAI, etc. '02 Firebird, V6, auto '68 GTO Convertible, HO, 4spd, driver '66 LeMans Hardtop, 400, FI, A/C, 4L80E. '64 GTO Hardtop, "389", Tri-power, 5 speed, A/C, Yorktown Blue. http://www.gtoaco.com |
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#3
11-09-2010, 08:54 AM
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Piston slap..... unfortunatly .... normal. Mine has been doing it since new.... 160,000 miles later.... no better .... no worse.
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Troy Rockaway NJ 67 GTO 400HO / TKX 3.27 1ST GEAR-.72OD / 3.36 POSI HOTCHKIS/UMI/BILSTEIN 
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#4
11-09-2010, 11:04 AM
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My 5.3 didn't have that.(traded at 110,000) I used Moble 1 sence new and a can of seafom every other tank,
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Why is he not suspended? |
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#5
11-09-2010, 11:28 AM
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A lot of 5.3s do this, not a concern really, my 2000 Tahoe 235,000 miles done it since day one. GM released a statement they would cover the engine for 100k when it first started.
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#6
11-09-2010, 11:40 AM
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My 99 F-150 (4.6) just started doing this. Oil consumption is about a quart a month. Goes away after a few miles.
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The joker in the deck keeps sending me his card. Smiling friendly, he takes me in. Then breaks my back in a game I can't win. |
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#7
11-09-2010, 11:59 AM
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Not at all uncommon. I owned one of these new generation engines a 6.0 in my 99' 2500 Silverado,and I think more people HAD this problem than ones that didn't. It is so common that they stickey'ed it on my truck site.
http://www.fullsizechevy.com/showthr...ine-Knock-Info Note that this thread was started about 8 years ago! You can read for hours on this subject.
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 71' GTO -original 400/4-speed/3.23 posi 13.95 @ 102.1 on street tires @ 4055lbs. ‘63 LeMans- ‘69 400 w/ original transaxle. 2.69 gears. |
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#8
11-09-2010, 01:04 PM
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Are you running a "bargain" oil filter? Some filters have check valves to prevent drain back. I run a Mobil 1 on my Dakota and since then I have NO start up noises. It's worth a try. The shops I deliver parts to swear by that Seafoam product also.
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“Nothing in the world can take the place of persistence. Talent will not; nothing is more common than unsuccessful men with talent. Genius will not; unrewarded genius is almost a proverb. Education will not; the world is full of educated derelicts. Persistence and determination alone are omnipotent. The slogan Press On! has solved and always will solve the problems of the human race.” ― Calvin Coolidge |
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#9
11-09-2010, 01:11 PM
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Same here, 99 gmc. As the mornings get colder I get in the habit of letting it warm up just a minute, maybe two, and I usually dont hear it.
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 68 Firebird, trying a q-jet now. 434/10.5:1/997's/240-242 HFT/4L80E/2800 Yank/3.42's/ Vintage Air/ 13.0 @105 mph 70 Lemans, 350/350, A/C, mostly stock 14 Ram CC, 5.7 Hemi, 8-speed, 3.92 lsd 97 Trans Am, HPP Aug 2012 http://www.highperformancepontiac.co...tiac_trans_am/ ***Sold*** |
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#10
11-22-2010, 10:53 PM
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Update: I changed the oil and the clattering went away completely. I guess she'll let me know when it's time for an oil change....
__________________
I could explain all this to the girl at the parts store, but she'd probably call the asylum. White '67 LeMans 407/TH350/Ford 3.89... RIP Red '67 LeMans. 407/TH400/Ford 3.25 |
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#11
12-07-2010, 08:16 AM
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Now everytime it sits for a few hours, it gives a big puff of blue smoke on startup. It just started doing this after the valveclatter episode. 125K miles on truck. I changed the oil twice recently hoping it was overfilled or bad oil. Is this related to the clattering or just normal wear? Runs fine otherwise but the smoke looks ghetto.
5.3L gas engine. Is this typical? What could I check?
__________________
I could explain all this to the girl at the parts store, but she'd probably call the asylum. White '67 LeMans 407/TH350/Ford 3.89... RIP Red '67 LeMans. 407/TH400/Ford 3.25 |
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#12
12-07-2010, 05:34 PM
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I noticed my SS started to do this in the summer. It goes away by the end of the block. Think I will try the "seafoam" which I have never heard of! So what is this stuff, like a zinc additive. Thanks Dave K.
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#13
12-07-2010, 06:52 PM
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seafoam is nothing more than a solvent
bad for bearings
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Everything comes and goes Pleasure moves on too early And trouble leaves too slow |
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#14
12-07-2010, 09:44 PM
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The 5.3 in my 99 GMC does the same thing...but it sounds like it's one lifter and not piston slap, and only does it when it is cold outside during cold start ups. It started doing it when my father still owned the truck and it had less than 50K miles on it. It always goes away after 1 minute though, once the oil gets flowing good. It has 158K miles on it now, and started using oil around 125K miles. It goes through 1 to 1.5 quarts of oil every 3K miles. I'm sure it's burning it but I can find no evidence of it on the plugs or out the tailpipe. I'm not worried about it, I'll just keep driving it until it quits.
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Just a blind squirrel looking for a nut. |
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