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#4669257 - 02/18/18 02:57 AM Guesses? Severe piston slap = high wear metals?
Gasbuggy Offline


Registered: 08/26/09
Posts: 1895
Loc: PA
My 2002 Yukon XL has thee worst cold piston slap of any 5.3 I've ever heard. And I've owned and drove many. Random citizens with likely no car knowledge whatsoever turn and stare when I fire it up and drive off. I'm sure the neighbors are confused because my driveway looks like James Bond lives here but half the time I'm rolling out in something that sounds like it's about to blow up. It has the charm of a rod knock but it is merely piston slap. Piston slap so bad it throws the knock sensors off for the first 30 seconds if it's below freezing. I bought it in the summer so I didn't get fully acquainted with the severity until this winter.

I changed the clean Jiffy Lube oil when I bought it and put in MaxLife 10w30. It hardly has burned a drop of oil in 5000 miles, burns rubber though. I'll probably change it at 7k. No complaints for a $1500 beater that was maintained and had newer tires, brakes, and cooling system.

Anyone want to throw a guess on if wear metals will be higher with this condition? I can't see how it wouldn't. I mean, something is smashing into something every time I cold start it. You can still lightly hear it when it's fully warmed up.
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95 Accord - 386k. Mobil 2 RIP

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#4669260 - 02/18/18 03:53 AM Re: Guesses? Severe piston slap = high wear metals? [Re: Gasbuggy]
Shannow Online   content


Registered: 12/12/02
Posts: 39873
Loc: 'Stralia
As an engineer, piston slap tells me that things aren't operating correctly.

Things that should be happening in a slappy engine are:
* Higher, irregular loading of points on the piston skirts (more wear)
* higher scyclic loading including impact on the skirts (high cycle fatigue)
* cocking of the piston rings (reduced seal and wear).

But the things seem to typically live lives that see out the chassis and running gear, so like the other compromises that OEMs make "not ideal" is not the same as "about to blow up.

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#4669263 - 02/18/18 04:12 AM Re: Guesses? Severe piston slap = high wear metals? [Re: Gasbuggy]
4WD Offline


Registered: 09/21/10
Posts: 6390
Loc: Texas
I thought guys like short skirts. The worst I had was a 2004 Yukon … about 10 seconds after start up and done= after we put 130k trouble free on the unit … saw it around town for a few years after. BiL put 400k on his and the motor never failed … it did it …Some have called the polymer coating a band aid … but they are not wearing out prematurely …
My 2010 has a tiny amount at start up … the 2017 is just a very quiet motor, period.

You could experiment with various oils and see what happens …

http://www.autos.ca/auto-tech/auto-tech-noisy-engine-it-might-be-piston-slap/


Edited by 4WD (02/18/18 04:16 AM)

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#4669275 - 02/18/18 04:51 AM Re: Guesses? Severe piston slap = high wear metals? [Re: Gasbuggy]
das_peikko Offline


Registered: 01/01/18
Posts: 516
Loc: San Antonio, TX
10W-40 MaxLife would probably be better. It'd give you more film thickness on the cylinder wall. More film thickness might offer a better cushion between the piston and cylinder wall.

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#4669316 - 02/18/18 07:09 AM Re: Guesses? Severe piston slap = high wear metals? [Re: Gasbuggy]
Triple_Se7en Offline


Registered: 12/04/04
Posts: 8773
Loc: 1/2 hr. north of Detroit
Originally Posted By: Gasbuggy
My 2002 Yukon XL has thee worst cold piston slap of any 5.3 I've ever heard. And I've owned and drove many. Random citizens with likely no car knowledge whatsoever turn and stare when I fire it up and drive off. I'm sure the neighbors are confused because my driveway looks like James Bond lives here but half the time I'm rolling out in something that sounds like it's about to blow up. It has the charm of a rod knock but it is merely piston slap. Piston slap so bad it throws the knock sensors off for the first 30 seconds if it's below freezing. I bought it in the summer so I didn't get fully acquainted with the severity until this winter.

I changed the clean Jiffy Lube oil when I bought it and put in MaxLife 10w30. It hardly has burned a drop of oil in 5000 miles, burns rubber though. I'll probably change it at 7k. No complaints for a $1500 beater that was maintained and had newer tires, brakes, and cooling system.

Anyone want to throw a guess on if wear metals will be higher with this condition? I can't see how it wouldn't. I mean, something is smashing into something every time I cold start it. You can still lightly hear it when it's fully warmed up.


I wouldn't do 7K OCIs using semi-synthetic on a 16 year-old vehicle. Many semi-synthetics only have around 25-30% synthetic oil in the jug.

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#4669350 - 02/18/18 07:57 AM Re: Guesses? Severe piston slap = high wear metals? [Re: Gasbuggy]
gfh77665 Offline


Registered: 09/01/08
Posts: 3799
Loc: Southeast Texas
Originally Posted By: Gasbuggy
No complaints for a $1500 beater that was maintained and had newer tires, brakes, and cooling system.


SAE 30wt. in winter, SAE 40wt. rest of the year.

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#4669370 - 02/18/18 08:12 AM Re: Guesses? Severe piston slap = high wear metals? [Re: Gasbuggy]
gregk24 Offline


Registered: 04/13/13
Posts: 5602
Loc: FL, USA
I don't think I have ever heard or read of piston slap killing an engine. I know my previous Accord slapped from the time I got it at 97K miles to when I traded around 140K. I know its not the same miles as yours but again, no issues with mine.
_________________________
2012 Honda Accord EX-L K24z3
53,xxx miles
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37,xxx miles
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#4669378 - 02/18/18 08:18 AM Re: Guesses? Severe piston slap = high wear metals? [Re: gregk24]
4WD Offline


Registered: 09/21/10
Posts: 6390
Loc: Texas
Originally Posted By: gregk24
I don't think I have ever heard or read of piston slap killing an engine. I know my previous Accord slapped from the time I got it at 97K miles to when I traded around 140K. I know its not the same miles as yours but again, no issues with mine.


Internet is full of things

https://m.youtube.com/watch?v=fwe7qxu10sU

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#4669415 - 02/18/18 08:40 AM Re: Guesses? Severe piston slap = high wear metals? [Re: Gasbuggy]
mjk Offline


Registered: 02/15/11
Posts: 1233
Loc: Wishin' I was in Wi
Since it really owes you nothing, and the 5.3 will outlast the body, throw in a quart of Lucas and see if that quiets it.



coffee coffee

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#4669420 - 02/18/18 08:44 AM Re: Guesses? Severe piston slap = high wear metals? [Re: mjk]
4WD Offline


Registered: 09/21/10
Posts: 6390
Loc: Texas
Originally Posted By: mjk
Since it really owes you nothing, and the 5.3 will outlast the body, throw in a quart of Lucas and see if that quiets it.



coffee coffee


No ~ Slick 50 dude

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#4669428 - 02/18/18 08:48 AM Re: Guesses? Severe piston slap = high wear metals? [Re: Gasbuggy]
wwillson Offline

Administrator


Registered: 08/20/03
Posts: 2161
Loc: Naperville, IL
My 5.3L 2002 Suburban had loud piston slap for the first couple minutes after startup. I did several oil samples, which are posted here, and the wear metals were always low. The piston slap didn't seem to cause accelerated wear, just the annoying knocking.

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#4669437 - 02/18/18 08:53 AM Re: Guesses? Severe piston slap = high wear metals? [Re: Gasbuggy]
SteveSRT8 Offline


Registered: 10/10/08
Posts: 18954
Loc: Sunny Florida
We have had many GM V8 "slappers" over the years. Never any issues other than some annoyance.

Our worst slapper was sold with over 500k miles on it, doesn't seem to hurt longevity at all...
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#4669450 - 02/18/18 09:02 AM Re: Guesses? Severe piston slap = high wear metals? [Re: wwillson]
4WD Offline


Registered: 09/21/10
Posts: 6390
Loc: Texas
Originally Posted By: wwillson
My 5.3L 2002 Suburban had loud piston slap for the first couple minutes after startup. I did several oil samples, which are posted here, and the wear metals were always low. The piston slap didn't seem to cause accelerated wear, just the annoying knocking.


Didn’t you run like a 15w40 Delvac ? I’m finding on that or Delvac 1 5w40 there is really little difference at startup

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#4669532 - 02/18/18 10:13 AM Re: Guesses? Severe piston slap = high wear metals? [Re: Gasbuggy]
Linctex Offline


Registered: 12/31/16
Posts: 6148
Loc: Waco, TX
20% oil capacity with Lucas Oil "stabilizer"

Yes, it's thick snake oil - but it will help quite a bit.
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(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."

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#4669535 - 02/18/18 10:16 AM Re: Guesses? Severe piston slap = high wear metals? [Re: SteveSRT8]
car51 Online   content


Registered: 03/12/15
Posts: 10257
Loc: Southwest PA
Originally Posted By: SteveSRT8
We have had many GM V8 "slappers" over the years. Never any issues other than some annoyance.

Our worst slapper was sold with over 500k miles on it, doesn't seem to hurt longevity at all...



Yep, we sold our 2010 5.3 v-8 plow truck Chevy 2500 reg cab 4x4 with 279,xxx on it and it had this piston slap and nothing but Safety Kleen 5w30 DEXOS oil
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2009 Toyota Camry LE

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