Piston Slap?
03-28-2007, 07:11 AM
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Piston Slap? well i noticed latly in the colder mornings when i first start my car i can hear like a knocking. The engine shop down the rd from me said its a piston slap and its casued bc its cold out and gms are known?Well my question is what should i do and how do i found out what it is? Could be the valve train or lower half idk. HELP it has 86k on it
03-28-2007, 07:16 AM
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Its probably the infamous piston slap that these cars have especialy when it is cold outside. I wouldnt sweat it too much since the slap goes away one the engine gets warm and the parts expand.
03-28-2007, 11:40 AM
#3
My car has had the piston slap noise since the first oil change (bought it at 22,000 miles). It had the lifters changed under warranty, I had it in so many times they extended my engine warranty for I forgot how much longer.
Had belts, pullies, tensioners changed too. Nothing fixed the problem, still does it today, not better not worse. It's been down the track a few times and revved to 6000 a lot. Now it has 37,000 on it so I guess I'm not going to worry. Have a listen, this is back around 26,000 miles
Had belts, pullies, tensioners changed too. Nothing fixed the problem, still does it today, not better not worse. It's been down the track a few times and revved to 6000 a lot. Now it has 37,000 on it so I guess I'm not going to worry. Have a listen, this is back around 26,000 miles
03-28-2007, 12:03 PM
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Sounds exactly like mine has since brand new. Dealer wanted to replace the pistons per Preliminary Service Bulletin 00150 back in '02.
I told them I didn't want their mechanic to tear my brand new engine apart.
Denied.
Still makes the noise. I have 31K miles on it and a 50K, 7 year warranty. Warranty will last until the '09's come out. I use Mobil 1 5w30.
By the way, this car has had P0410 code once and they replaced 1997272 solenoid. That's it except for both front RL/turn indicator lights have burned out which I replaced.
Otherwise the car has been perfect. I haven't even replaced the tires, battery, windshield wiper blades, etc, na-da yet.
It is at the dealer's body shop right now getting the sail panel repaired for paint bubbles, Service Bulletin 03-08-98-001A.
I told them I didn't want their mechanic to tear my brand new engine apart.
Denied.
Still makes the noise. I have 31K miles on it and a 50K, 7 year warranty. Warranty will last until the '09's come out. I use Mobil 1 5w30.
By the way, this car has had P0410 code once and they replaced 1997272 solenoid. That's it except for both front RL/turn indicator lights have burned out which I replaced.
Otherwise the car has been perfect. I haven't even replaced the tires, battery, windshield wiper blades, etc, na-da yet.
It is at the dealer's body shop right now getting the sail panel repaired for paint bubbles, Service Bulletin 03-08-98-001A.
03-28-2007, 07:07 PM
#6
Originally Posted by 8a8mfh
My car has had the piston slap noise since the first oil change (bought it at 22,000 miles). It had the lifters changed under warranty, I had it in so many times they extended my engine warranty for I forgot how much longer.
Had belts, pullies, tensioners changed too. Nothing fixed the problem, still does it today, not better not worse. It's been down the track a few times and revved to 6000 a lot. Now it has 37,000 on it so I guess I'm not going to worry. Have a listen, this is back around 26,000 miles
Had belts, pullies, tensioners changed too. Nothing fixed the problem, still does it today, not better not worse. It's been down the track a few times and revved to 6000 a lot. Now it has 37,000 on it so I guess I'm not going to worry. Have a listen, this is back around 26,000 miles
thats exactly what mine sounds like except not as loud tho....im the second owner and its being doing it since ive had at... i had a girl ask me before if i had a diesel engine in it....
03-28-2007, 07:26 PM
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I have it bad also. I just let it warm up some before I drive it and measure my drain oil to check for consumption, other than that I beat the **** out of it
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03-28-2007, 08:07 PM
#8
Originally Posted by z28_n_tx
thats exactly what mine sounds like except not as loud tho....im the second owner and its being doing it since ive had at... i had a girl ask me before if i had a diesel engine in it....
03-28-2007, 09:19 PM
#10
Yeah, just piston slap. Probably scoring the walls and blow up in another 2K or so miles.
J/K!!!
My friend had a 60K mile LS1 in his 3rd gen IROC and it slapped HELLA BAD! When he pulled the heads to do a head/cam swap the cylinder walls looked PERFECT and still had the hash marks ect. Not a bit of scoring. Don't sweat it, I don't think of it as piston slap as much as I think of it as my motor mocking the way a 4.6's knees knock when I get around them.
J/K!!!
My friend had a 60K mile LS1 in his 3rd gen IROC and it slapped HELLA BAD! When he pulled the heads to do a head/cam swap the cylinder walls looked PERFECT and still had the hash marks ect. Not a bit of scoring. Don't sweat it, I don't think of it as piston slap as much as I think of it as my motor mocking the way a 4.6's knees knock when I get around them.
