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TrailblazerSS
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Discussion Starter #1
in my previous thread i asked about a catalytic converter being bad! well now im starting to think its piston slap! my question is would piston slap just come outta nowhere? cause everything was fine until last friday! i always change my oil at 3,000 miles with either mobil 1 extended performance or royal purple! and either k&n or mobil 1 oil filters! when my engine is warm everything is quiet as normal! however i did notice that when i rev it after it warms up the exhaust makes a popping when i let off the throttle, im thinking its from back pressure but i never noticed it before! im bone stock! and i do have a mechanics stethoscope which put on the cylinder head while it was rattling and everything sounded smooth as can be! WTF is going on! its driving me crazy!
 

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Premium Member
Trailblazer SS
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15,616 Posts
Could be a exhaust leak your hearing
 

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TrailblazerSS
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Discussion Starter #5
sorry i dont understand what "piston slap" is.... im new to LS motors! anyway when i start it up after being cold or even letting it sit for 20 min or so it sounds like its rattling!
 

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Banned
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TrailblazerSS
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Discussion Starter #7
If you dont understand what it is..you shouldn't be using the terminology.
Its simple really.
(and yes, I am an Asshole)
lol! i kinda figured! so does the asshole have any suggestions?
 

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TrailblazerSS
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Discussion Starter #8
also! if it is the catalytic converter thats rattling, would it stop after it warmed up?
 

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TrailblazerSS
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Discussion Starter #9
something new! this morning after everything was warmed up and there was no rattle, i got on it and my CEL started blinking! so i immediately let off and it went away! WTF is going on?
 

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TrailblazerSS
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Discussion Starter #11
it goes in on monday!
 

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Mattmikemark
2006 Trailblazer SS
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5,366 Posts
What a newb question... Piston slap? Really?
 

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Midgets with hammers
'06 TBSS AWD
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15,999 Posts
Wow..... This thread made me lol.

So what was the problem Slappy?
 

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TrailblazerSS
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Discussion Starter #14
Bad catalytic converter
 

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TrailblazerSS
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Discussion Starter #16
Haha! Thanks Darren
 
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