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#1
08-03-2008, 10:59 PM
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Engine knock on cold startup
Ok so i have a 1994 Grand Prix SE with a 3100 engine with about 118000 miles. When i start it cold the engine has a pretty loud knock for about 1-2 mins or untill i drive it a little. i changed the oil but it is still there. Sounds like it is coming from more towards the bottom of the engine not the top like a valve clatter. I bought Rislone Engine Treatment from walmart (Teal colored cleaner that works slow) And it still is knocking. Any ideas whats wrong / i could try to make it go away would help. Thanks
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#3
08-04-2008, 04:16 PM
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Re: Engine knock on cold startup
I agree with Troy. Piston slap is very common on these engines, and your symptoms are textbook.
__________________
 Still waiting for the "good old days" I'll get to bore my future grandchildren with!
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#5
08-05-2008, 04:08 PM
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Re: Engine knock on cold startup
Quote:
http://www.pistonslap.com/
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'08 Pontiac Grand Prix GXP (Dark Slate Metallic) - LS4 5.3L V8 '02 Oldsmobile Alero GL2 - LA1 3400 V6 '99 Buick Regal LS - L36 Series II 3800 V6 '03 Honda CR250R MX - 2 Stroke 250cc '97 Pontiac Grand Prix GTP - L67 Series II 3800 V6 Supercharged (Sold) Timeslip 08/12/06 AF Community Guidelines
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#6
08-06-2008, 09:33 AM
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Re: Engine knock on cold startup
Well, that's very interesting. My wife's 1998 Montana (3400) has piston slap. I always thought it was a noisy valve train. It actually makes me feel better knowing that it is piston slap. When the engine warms up, it does not do it. You would think in this day and age, GM could make a good quality engine.
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#7
08-06-2008, 09:51 AM
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Re: Engine knock on cold startup
We get it in our Alero. Only lasts for about 30 sec to worse case 1 minute. Some things you can do just to be safe is make sure the engine oil is 5W-30 and of good quality to include the oil filter. Especially a decent anti-drainback valve so the engine doesn't get any so called dry starts. Needless to say other than that something you have just to live with until you get rid of it.
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'08 Pontiac Grand Prix GXP (Dark Slate Metallic) - LS4 5.3L V8 '02 Oldsmobile Alero GL2 - LA1 3400 V6 '99 Buick Regal LS - L36 Series II 3800 V6 '03 Honda CR250R MX - 2 Stroke 250cc '97 Pontiac Grand Prix GTP - L67 Series II 3800 V6 Supercharged (Sold) Timeslip 08/12/06 AF Community Guidelines
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#8
08-07-2008, 01:41 AM
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Re: Engine knock on cold startup
haha, yup...completely normal. my 2004 Grand Am with the 3400 had 40K on it when i traded it in. the "piston slap" started around 15K. annoying as hell...but nothin you can do about it. only 1 of about 100 reasons i got rid of the car not even a year after owning it
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#9
08-07-2008, 09:57 AM
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Re: Engine knock on cold startup
why didnt you like the grand am? I agree grand prixe's are way better, but grand am's are OK cars.
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-2000 Grand Prix GTP 170,000mi (daily driver) -2000 Olds Alero 100,000mi (soon to be DD with gas at $3.45/gal) -1997 Chev K1500 4x4 115,000mi (Natalie's truck [nans_grandprix]) AF "2.0" Community Guidelines Conservative Victory 2012!!! "I'll Keep my Guns, Freedom, and Money. You can Keep the Change!" ----->>>>> Did You Know? <<<<<-----
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