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Old 12-09-2002, 09:29 PM   #1
2sour4u
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Default Engine Knocking?

My car knocks when I first start it up. Now I know why it is doing it. Its because of the cold weather. Its never done this befor, just now that it has started to get cold. It does it for about 20-30sec. than goes away. Now my question is, will this minor knock harm my car at all.

Jon
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Old 12-09-2002, 09:40 PM   #2
obyone
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Does it only happen when you leave your car sitting over night, in the cold? Does it go away when the car warms up?

I get the same thing too. So does my mom's Civic.
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Old 12-09-2002, 10:30 PM   #3
Ghomer1
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Probaby valve tap, not knocking (otherwise known as detonation).

I wouldn't worry about it...just make sure you have a winter weight oil.

G
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Old 12-10-2002, 02:18 PM   #4
GyroCap
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I've been noticing the same sound in my car lately. It goes away as it warms up. I have less than 20k miles, so I'm guessing it's a normal thing...at least I hope it is.
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Old 12-10-2002, 02:46 PM   #5
99OBSter
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Did Subaru ever solve the whole piston slap issue? Because, if not, that's wnat it sounds like to me.

My car, MY99OBS with 76K miles, does it on cold mornings.
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Old 12-11-2002, 02:19 AM   #6
dcgear
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when you guys talk about engine knocking, do you mean it only knocks once right when u crank the ignition or does it continue?
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Old 12-11-2002, 03:28 AM   #7
HndaTch627
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Quote:
Originally posted by 99OBSter
Did Subaru ever solve the whole piston slap issue? Because, if not, that's wnat it sounds like to me.

My car, MY99OBS with 76K miles, does it on cold mornings.
nope, they declared it a normal operating condition, except with phase 1 bottom ends it was too severe to pass by so they had to replace a few engines

jeremy
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Old 12-11-2002, 07:31 AM   #8
99OBSter
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Ah, the joys of owning a boxer subaru! Reminds me of my Diesel Rabbit glory days back in college. You wanna hear startup noise? Stant next to that monster!
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Old 12-11-2002, 07:37 AM   #9
paultg
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Try doing a search on "Timing Belt Tensioner".
It will provide some very interesting information.

Paul G.
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Old 12-11-2002, 08:06 AM   #10
2sour4u
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Yes it does it when I let it sit over night. And it only does it for a couple of seconds, then goes away. I put in what my owners manual says to put in 5w30.

Jon
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Old 12-11-2002, 01:44 PM   #11
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Piston slap and valve lash. Common, documented, deal with it. Now, if your neighbors are waking up when you start the car in the morning (coffee can mufflers excluded) then you should stop by the dealer.
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Old 12-11-2002, 01:52 PM   #12
HndaTch627
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Quote:
Originally posted by BOY
Piston slap and valve lash. Common, documented, deal with it. Now, if your neighbors are waking up when you start the car in the morning (coffee can mufflers excluded) then you should stop by the dealer.
LMAO!
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Old 12-11-2002, 02:13 PM   #13
BOY
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what?
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Old 12-11-2002, 06:46 PM   #14
2sour4u
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Well thankfully it hasn't come to that yet. It's just a very faint knock, only the daily driver would notice it. I guess I will have to deal with it. Anyways, thank-you all for your knowledge.

Jon
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Old 12-12-2002, 06:28 AM   #15
obyone
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Quote:
Originally posted by 2sour4u
Well thankfully it hasn't come to that yet. It's just a very faint knock, only the daily driver would notice it. I guess I will have to deal with it. Anyways, thank-you all for your knowledge.

Jon
Mine isn't. It's more of a medium sounded knock knock knock knock knock......that can be heard inside the car aswell. Funny thing is that it seems to be stronger/louder on the driver side cylinder bank than the pass one.

Once the car is warmed up, the knock dissapears. It also doesn't come back if I let the engine cool down for 8 hours. It only happens when I first warm it up in the morning.

Hmmmm......Would new cams (cobb) and a valve adjustment fix this?
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Old 12-12-2002, 10:02 AM   #16
BOY
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Cobb cams would definaely make the piston slap less noticable but only the valve lash noise .
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Old 12-12-2002, 11:56 AM   #17
salopian
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I've been told by my (British) dealer that it's piston slap and is common in engines built in the US. He maintains that it's causing no great harm so doesn't need fixing but he'd be happy to charge me $2,000 to do it!
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Old 12-12-2002, 12:44 PM   #18
BOY
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lol, I'm sure he would.
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