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Diagnosing 2008 GM 5.3 startup noise #4546030
10/17/17 08:50 AM
10/17/17 08:50 AM
Joined: Jan 2007
Posts: 806
El Oeste
HawkeyeScott Offline OP
HawkeyeScott  Offline OP
Joined: Jan 2007
Posts: 806
El Oeste
I have a Chevy 5.3 in a 2008 Suburban with 118K miles. Current oil fill is Mobil 1 0W-30 with a Wix filter. Morning temps have been in the lower 30s the last couple of weeks. Again today, I had a prominent tick or slap at startup. I was thinking (hoping) it was a pulley but the stethoscope told me it was coming from under the valve cover on the driver's side near the front. It lasted several minutes before I pulled out of the driveway. I stopped and got out about 1.5 miles away from home and it was gone. I've had this happen from time to time since I bought the vehicle last January. I didn't notice it in the summer months at all. But for the oil I'm using, there should be any flow problems when the temps are right at 32. Also, I've checked the oil filters I've pulled off it and there's no unusual debris or gunk. A little varnish that was on the dipstick when I bought it has been cleaned up for several months now. So there shouldn't be junk in there clogging passages. FWIW, I park uphill in the driveway but oil pressure gauge reads fine.

Any ideas what I'm hearing and why? Thanks.

Re: Diagnosing 2008 GM 5.3 startup noise [Re: HawkeyeScott] #4546045
10/17/17 09:07 AM
10/17/17 09:07 AM
Joined: Feb 2009
Posts: 1,587
wv
krismoriah72 Online content
krismoriah72  Online Content
Joined: Feb 2009
Posts: 1,587
wv
Piston Slap. Common in the LS engines. I have it in mine and so does my buddies. Just something you need to get used to..wont affect the lifespan. I have used 5w30, 10w30, 5w40 and 15w40..nothing seems to make a difference. Just a design flaw.

Re: Diagnosing 2008 GM 5.3 startup noise [Re: HawkeyeScott] #4546054
10/17/17 09:16 AM
10/17/17 09:16 AM
Joined: Nov 2009
Posts: 5,126
Houston, Texas
motor_oil_madman Offline
motor_oil_madman  Offline
Joined: Nov 2009
Posts: 5,126
Houston, Texas
Supposedly ebginengines with short skirt pistons have this problem. They do it for fuel economy


2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

Re: Diagnosing 2008 GM 5.3 startup noise [Re: HawkeyeScott] #4546057
10/17/17 09:20 AM
10/17/17 09:20 AM
Joined: Apr 2017
Posts: 1,460
San Rafael, CA
dogememe Offline
dogememe  Offline
Joined: Apr 2017
Posts: 1,460
San Rafael, CA
This has AFM/DOD, right? You can use a device like a "Range AFM Disable" or get a custom tune. You will not lose fuel economy, and it's better for the engine long term. Not sure if it will help your startup noise but at least you can get rod of the AFM garbage.


2010 Ford Escape 2.5 ~91K Miles: AMSOIL SS 5W-30, AMSOIL SS FE ATF.
1995 Chevy Silverado 5.7 ~277K Miles: Delo 10W-30, AMSOIL OE MV ATF.
AMSOIL
Re: Diagnosing 2008 GM 5.3 startup noise [Re: HawkeyeScott] #4546058
10/17/17 09:20 AM
10/17/17 09:20 AM
Joined: Feb 2009
Posts: 8,806
Texas
440Magnum Offline
440Magnum  Offline
Joined: Feb 2009
Posts: 8,806
Texas
If its a "bright" tick or click, its just a lifter that drained down. If its a deeper "rap" somewhat like a diesel, then its piston slap. Neither one is harmful, neither one is worth doing ANYTHING about. There was a big kerfluffle over the Gen-IV GM v8s came out and had prominent piston slap (the engines commonly and generally referred to as the LSx engines, even if its really an LQ). Its not a problem with the LSx engine, its a problem with all the engines that came before it. The older engines had offset piston pins and tall piston skirts that minimized piston slap by "pre-loading" the piston thrust face, but the downside was a bit more power wasted on friction. Quiet, but wasteful. Most modern engines have very short skirted, lightweight pistons with centered pins to minimize friction and maximize power, the cost being a little more noise due to piston slap.


'66 Dodge Polara & '69 Dodge Coronet R/T both 440/727
'08 Ram 1500 4.7/545RFE
'12 Challenger SRT8 392/6-speed
'99 XJ 4x4 4.0/AX15, '14 WK2 4x4 3.6/8HP
Re: Diagnosing 2008 GM 5.3 startup noise [Re: HawkeyeScott] #4546061
10/17/17 09:22 AM
10/17/17 09:22 AM
Joined: Aug 2004
Posts: 1,406
VA
Rhymingmechanic Offline
Rhymingmechanic  Offline
Joined: Aug 2004
Posts: 1,406
VA
Here's a wild guess--check to see if any of your exhaust manifold bolt heads are broken off. It could be an exhaust leak. (I learned that's a common problem from ls1mike last summer.)

My 2001 5.3 started to knock slightly for the first few minutes after a cold start last year, whenever temperatures were in the 40s or below. Oil was Mobil 1 5-30, 115,000 current miles. I figured piston slap was finally catching up with me and would let it run an extra minute or so before driving.

In June I found a broken front exhaust manifold bolt, thanks to Mike, and installed a clamp to tighten the manifold back down. We've had a few cool mornings this week, and the truck hasn't knocked yet. Tomorrow morning is supposed to be in the 40s, so that should be the test.

Re: Diagnosing 2008 GM 5.3 startup noise [Re: HawkeyeScott] #4546272
10/17/17 12:50 PM
10/17/17 12:50 PM
Joined: Jan 2007
Posts: 806
El Oeste
HawkeyeScott Offline OP
HawkeyeScott  Offline OP
Joined: Jan 2007
Posts: 806
El Oeste
Thanks, everyone. Great info. and it sounds like nothing to get too bothered by.

Yep, it has the AFM feature. And I'll check manifold bolts.

440Magnum, I'd label it more tick or click than a diesel-like rap. Based on your info., I'd lean more towards this being a lifter issue.

Re: Diagnosing 2008 GM 5.3 startup noise [Re: HawkeyeScott] #4546307
10/17/17 01:34 PM
10/17/17 01:34 PM
Joined: Dec 2006
Posts: 1,789
NY, NY
NYEngineer Offline
NYEngineer  Offline
Joined: Dec 2006
Posts: 1,789
NY, NY
My 2009 with about 138,000 on it lifter clacks and piston slaps for the first few seconds of startup. I hate it but once it has a little temp in it the piston slap goes away. The lifters only tick for a few seconds.
BTW, I run 5-30 Mobil 1 and a Baldwin oil filter.

Re: Diagnosing 2008 GM 5.3 startup noise [Re: HawkeyeScott] #4546491
10/17/17 05:17 PM
10/17/17 05:17 PM
Joined: Jan 2009
Posts: 13,990
Illinois
tig1 Offline
tig1  Offline
Joined: Jan 2009
Posts: 13,990
Illinois
A friend even sued GM over the start up noise, but lost.


2007 Ford Fusion 235,000 miles
M1 0-20 EP
2017 Ford Fusion 61K
M1 0-20 EP
10,000 mile OCIs on both engines
M1 ATF and Valvoline LV
M1 10-30 in all OPE
MC filters


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