12-05-2011, 04:20 PM
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#1
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GX Member
Join Date: Sep 2011
Location: Westchester, NY
Posts: 160
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Engine Knocks at cold start
My engine used to knock slightly at a cold start. as the temp is going down i notice it more. any help? like adding a thicker oil or something. Using 5w-30 high mileage
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2001 GLS 3.4L Coupe "Black Mamba"
Mods: K&N Cold Air Intake, 8000k H.I.D. Low Beam, 3000k H.I.D. Fog Lights.
Wants: SLP Exhaust, Ported UIM & LIM, 65mm TB, Lowering Springs, Rims, Black Interior.
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12-05-2011, 04:22 PM
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#2
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636 whp
Join Date: Aug 2006
Location: AZ
Posts: 11,914
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you want thinner so your oil gets circulated easier/faster in the colder weather
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12-05-2011, 04:54 PM
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#3
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Premier V.I.P. Member
Join Date: Dec 2009
Location: New Hampshire
Posts: 1,979
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u sure its not piston slap? 60 degree v6s are known for their piston slap
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The dumbass that shows up randomly 10 years after selling the car.
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12-05-2011, 08:41 PM
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#4
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GL Member
Join Date: Jan 2010
Location: Suffolk, Virgina
Posts: 609
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More than likely its piston slap. My dads 3100 Malibu did it in cold all the time. He also had a LS1 Camaro that sounded like a diesel in the cold because of piston slap.
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01 Alero 2.4 - Just minor mods...
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12-05-2011, 10:10 PM
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#5
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GX Member
Join Date: Sep 2011
Location: Westchester, NY
Posts: 160
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Anything I can do for the piston slap then?
& I thought you'd add thicker oil?.. The thinner it is, the easier it pushes through & slaps. Right?
The noise comes from the bottom of my engine I think. Oil pan area
__________________
2001 GLS 3.4L Coupe "Black Mamba"
Mods: K&N Cold Air Intake, 8000k H.I.D. Low Beam, 3000k H.I.D. Fog Lights.
Wants: SLP Exhaust, Ported UIM & LIM, 65mm TB, Lowering Springs, Rims, Black Interior.
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12-05-2011, 10:43 PM
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#6
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GL Member
Join Date: Jan 2010
Location: Suffolk, Virgina
Posts: 609
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You could try adding some lucas oil additive, that stuff is pretty thick, might quiet it down a little.
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01 Alero 2.4 - Just minor mods...
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12-06-2011, 10:30 AM
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#7
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GX Member
Join Date: Aug 2011
Location: Parkersburg, WV
Posts: 203
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Piston Slap is a very typical problem with our motors. The piston skirts are just too short. Mine does the same thing. I have tried 5w30, 0w30, and 10w30. All with the same result. What GM told me is, don't worry about it. They said it is just how they are designed. You could go buy a brand new motor, and by 25,000 miles into it, it is going to do the same thing. Thank you GM Design Team. Don't worry about it. Once it warms up, it's all good!
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Ahhhhh!!!!!! Don't Scratch My Paint!!!! 
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12-06-2011, 10:51 AM
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#8
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15.65 @ 87.3 MPH
Join Date: Nov 2009
Location: Sarnia, Ontario
Posts: 1,189
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IIRC I read something about the pistons being a little undersized, so when the engine warms up the pistons expand and there's no more piston slap. Just don't let the engine RPMs get too high just after a cold start.
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Hit a dear! Back to stock 3400... For now
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12-06-2011, 11:05 AM
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#9
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GLS member
Join Date: Aug 2010
Location: indy
Posts: 8,411
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yeah its comepletly normal.
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Oldsnut is my Hero!
Meet Destiny, shes a 2001 Oldsmobile Alero GLS, F40 6MT swap. (#2 of 3)
2/24/14 - 200,000 miles body/motor. 22,300 on F40.
Quote:
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He would Plasti Dip his pecker if he could.
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Quote:
Originally Posted by tipnitty
A girl touched my Pee Pee. So you can say things are getting pretty serious for me.
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12-06-2011, 11:08 AM
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#10
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Powered by LX9
Join Date: Mar 2010
Location: fox vally wi
Posts: 1,429
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Mine sounds like a damm diesel on cold start up, once its warm it sounds normal
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2001 ALERO GL SED 4 DR--Build Date: 08-16-2000. There are 17 2001 ALERO GL 4 DR vehicles (0.019%) matching my exact options list.
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12-06-2011, 05:57 PM
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#11
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GX Member
Join Date: Sep 2011
Location: Westchester, NY
Posts: 160
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Quote:
Originally Posted by Shiwnath
IIRC I read something about the pistons being a little undersized, so when the engine warms up the pistons expand and there's no more piston slap. Just don't let the engine RPMs get too high just after a cold start.
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but mine idles around to 1500 on a cold start...
__________________
2001 GLS 3.4L Coupe "Black Mamba"
Mods: K&N Cold Air Intake, 8000k H.I.D. Low Beam, 3000k H.I.D. Fog Lights.
Wants: SLP Exhaust, Ported UIM & LIM, 65mm TB, Lowering Springs, Rims, Black Interior.
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12-06-2011, 06:10 PM
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#12
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GL Member
Join Date: Jan 2010
Location: Suffolk, Virgina
Posts: 609
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Quote:
Originally Posted by Black_Mamba
but mine idles around to 1500 on a cold start...
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Thats fine. Hes saying dont be redlining the engine when its knocking. Or any cold engine for that matter.
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01 Alero 2.4 - Just minor mods...
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12-12-2011, 01:09 PM
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#13
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GL Member
Join Date: Nov 2003
Location: Weaverville, NC
Posts: 398
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Over 200,000 miles on mine and its been doing it for a couple of years. Goes away 90% when it warms up.  |
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