if my engine sounds like a diesel in the morning...
07-28-2006, 08:27 AM
#2
Melting Slicks
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St. Jude Donor '09
i don't know,turn it up. my 01 from day 1 had a noise in it when cold. the ls motors are alu. when they get some heat in them they quiet up. some say its a piston slap. i'm at 110000 k . nitrous some other stuff mine still running and oddly i don,t hear it any more.or im used to it
07-28-2006, 08:53 AM
#4
Instructor
Your proly running 89 octaine? Mine does the sme thing when it's cold. It's spark knock. Anti-spark hasn't kicked in yet, soon as it does, it goes away. Try a little higher octaine. It's no big deal, remember your at 10:1 or 10.5:1 compression requireing more "kick in the azz" fuel.
07-28-2006, 09:14 AM
#5
Melting Slicks
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St. Jude Donor '09
detonation on cold start? they run pretty rich on start up . ive not seen cold det. but ive never run anything but 93 oct. i got a lab scope ill probe knock sensors some day . all these years i felt it was a skirt issue amped up by the alu. block and its 'bell' resonance. tanks alot
07-28-2006, 09:46 AM
#6
Safety Car
I was under the impression it was piston slap as well...most of the guys with this have cured it with different oil filters such as the K&N unit...for what reasons I don't know how it worked...but they reported the results...
FWIW- I heard this on a friends 01 and he always ran 93 Octane fuel...put in a K&N filter and it was greatly reduced...
FWIW- I heard this on a friends 01 and he always ran 93 Octane fuel...put in a K&N filter and it was greatly reduced...
07-28-2006, 09:51 AM
#7
Team Owner
Originally Posted by buckdog06
Your proly running 89 octaine? Mine does the sme thing when it's cold. It's spark knock. Anti-spark hasn't kicked in yet, soon as it does, it goes away. Try a little higher octaine. It's no big deal, remember your at 10:1 or 10.5:1 compression requireing more "kick in the azz" fuel.
07-28-2006, 10:15 AM
#9
Instructor
Piston slap- sounds like a slight little hammer tapping on the block, even when at idle.
Spark knock- sounds like some pocket change in a coffee can if you were to jiggle it around, but mostly when under acceleration.
Spark knock- sounds like some pocket change in a coffee can if you were to jiggle it around, but mostly when under acceleration.
07-28-2006, 10:18 AM
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St. Donor '03 & '06
Originally Posted by ptdrummer54
go out to pistonslap.com and find the sound clip they have
07-28-2006, 01:31 PM
#13
Melting Slicks
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St. Jude Donor '09
like i said before it is some what common. i recall first week driving it when i left the house. i scared me i was pretty sure it was slap. i,m at 110000 k no problems. do you think that guy really runs cheap gas ?hey who knows.
07-28-2006, 01:38 PM
#14
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Originally Posted by patton
like i said before it is some what common. i recall first week driving it when i left the house. i scared me i was pretty sure it was slap. i,m at 110000 k no problems. do you think that guy really runs cheap gas ?hey who knows.
07-28-2006, 02:09 PM
#15
Melting Slicks
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Originally Posted by buckdog06
I like cheap! Cheap is $$$$'s in my pocket. But I never skimp on HIGH OCTAINE. Nothing wrong with cheap high octaine!!!!!
07-28-2006, 02:42 PM
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St. Jude Donor '08
Originally Posted by ptdrummer54
go out to pistonslap.com and find the sound clip they have
07-28-2006, 09:49 PM
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Originally Posted by ptdrummer54
go out to pistonslap.com and find the sound clip they have
He doesn't complain, He gets even
I hope someone sent this link to the boneheads at GM............Then again, why would I think they care?
07-28-2006, 09:53 PM
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Originally Posted by RichieRichZ06
If you believe the Bullchit on that site then you deserve to get "piston slapped" in your faces. The douche bags that made that crap up are morons who have never been around these motors and just like to b!tch about stupid crap.
I wouldn't expect that from a 217,000 mile engine. 
07-31-2006, 12:44 PM
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St. Jude Donor '08
Originally Posted by billatroadkill
So you're saying that the wear on the piston skirt and cylinder walls looked normal to you? I wouldn't expect that from a 217,000 mile engine.
I wouldn't expect that from a 217,000 mile engine. 