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Old 12-15-2004, 04:06 PM   #1
Dm0n3y002
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Default Knocking on cold start-up

Well the temps have diped below freezing and my engine is now making a knocking sound untill it is wormed up, after sitting overnight. I have herd that this is normal, which is weird to me, but can someone take a sound clip of there engine after sitting overnight in freezing temps. If u could rev it alittle too that would be cool, just want to compare sounds. Thanks.
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Old 12-15-2004, 05:22 PM   #2
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Do you have a catless uppipe? Since installing my helix up and ic hoses, I have noticed that same noise --has a kind of vw diesel sound, right?? I figured I had a leak somewhere becuase I don't remember hearing any noises like that from last winter --but my memory isn't too great either.
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Old 12-15-2004, 05:48 PM   #3
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I've got something similar. Nothing I would be too worried about, unless it get really loud. Just drive gently untill you are up to normal operating temps.
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Old 12-15-2004, 06:05 PM   #4
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The ticking noise on cold starts is pretty common... usually lilfter noise, and is a characteristic noise on Subaru opposed 4 cylinder motors.

/Andrew
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Old 12-16-2004, 01:16 PM   #5
Dm0n3y002
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I didnt says ticking, knocking. Sounds like piston slap.
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Old 12-16-2004, 01:23 PM   #6
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Quote:
Originally Posted by Dm0n3y002
I didnt says ticking, knocking. Sounds like piston slap.
Roger that! I had the same noise the other morning. Scared the jeepers outta me.
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Old 12-16-2004, 01:35 PM   #7
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Me too! Only does it right at start up and then I dont hear it anymore. Gives me a bad feeling deep inside my tummy!!
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Old 12-16-2004, 01:46 PM   #8
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Default Same sounds at startup too.

I hear the same kind of slapping/knocking but only at start-up also. I was also wondering if it could be a tiny leak at the up pipe that goes away as the metal starts heating up. My friend with the same setup as I do has a small up pipe leak and it's sound is a bit more distinct than the slap/knock I think we are describing.

I'm hoping/thinking it's normal.
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Old 12-16-2004, 01:52 PM   #9
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AHhhh I was just wondering when i was going to see a thead pertaining to this topic. Yeah its common i thought my engine was goign to slap itself silly yesterday night. Its normal just dont boost until ur oil temp is up to operating speed. Hence the major reason why i got an oil temp gauge.
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Old 12-16-2004, 02:07 PM   #10
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acusump!
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Old 12-16-2004, 03:51 PM   #11
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Somone get some sounds clips, lets compare sounds haha. Ill get a clip tomorrow.
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Old 12-16-2004, 06:16 PM   #12
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Probably Piston slap.. you should hear my motor with Je pistons it sounds like a galloping horse sometimes until it's at operating temp.

Also my stock ej205 had some cold weather/starting piston slap and valvetrain noise also, i dont think its anything to worry about. Just take it easy until your oil temp. is up.
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Old 12-16-2004, 11:12 PM   #13
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Galloping horse
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Old 12-16-2004, 11:41 PM   #14
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....d00ds....these engines make all sorts of noises that most other engines don't.....and the cold start noise is, indeed, piston slap and it's been happenin' to flat subie engines for a LONG time, now.... No worries m8's
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Old 12-17-2004, 12:06 AM   #15
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you guys sure that your oil filters have that flow valve in them that prevents the oil from seeping back down from the block when the engine is turned off?
stop being cheap, trying to save that extra dollar when buying filters.
Your rex would thank you.

-Yergi
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Old 12-17-2004, 01:23 AM   #16
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The subaru filters are upright
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Old 12-17-2004, 08:12 AM   #17
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Quote:
Originally Posted by mr2guru
The subaru filters are upright

....and at the very bottom of the whole damn thing, too
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Old 12-17-2004, 08:41 AM   #18
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Also consider running a 0W synthetic oil in the winter.
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Old 12-17-2004, 09:20 PM   #19
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Quote:
Originally Posted by yergi
you guys sure that your oil filters have that flow valve in them that prevents the oil from seeping back down from the block when the engine is turned off?
stop being cheap, trying to save that extra dollar when buying filters.
Your rex would thank you.

-Yergi
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Old 12-17-2004, 09:28 PM   #20
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Quote:
Originally Posted by WolfPlayer
Also consider running a 0W synthetic oil in the winter.


I wouldn't do that unless it gets VERY cold where you are....5w30 M1 is so thin that it pours like water as it is....
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Old 12-17-2004, 10:38 PM   #21
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I try to tell people 5W-50 for the car but everyone thought I was nuts!! Next time take my advice STi oil isn't 5W-50 for no reason!!!!
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Old 12-17-2004, 10:49 PM   #22
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Quote:
Originally Posted by DuoMaxwell
I try to tell people 5W-50 for the car but everyone thought I was nuts!! Next time take my advice STi oil isn't 5W-50 for no reason!!!!
well, 0W-10000000000000000000000000000000000000 would be the best oil there is. i use 15W-50 when it's not feezing outside and 5W-30 when it is freezing outside and i have to visit my folks in Pennsylvania in december. if i didn't autoX or track my car, i would probaly use 10W-30 or 5W-30 all year round.
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Old 12-17-2004, 10:54 PM   #23
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Mine does the same thing. Its just piston slap. They all do it when it's cold out....
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Old 12-18-2004, 12:55 AM   #24
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I just changed my oil tonight put in some Mobil1 5w/30, didnt stop the knocking at all but it was noticably smoother since i havnt changed my oil in 5k and i was using cheap castrol stuff. New Mobil1 Oil smells pretty good but new tranny fluid makes me want to vomit
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Old 12-18-2004, 01:03 AM   #25
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Quote:
Originally Posted by Uncle Scotty
I wouldn't do that unless it gets VERY cold where you are....5w30 M1 is so thin that it pours like water as it is....
0W-40 Mobil 1

t
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