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Cold start knock ~ bent somethin or another?
Cold start knock ~ bent somethin or another?
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Old 02-05-07, 06:16 PM   #1
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Default Cold start knock ~ bent somethin or another?

Temps here in Hoosier land (home of the Super Bowl Champs) has been in the single digits past week or so.

I seem to hear a tic from the right side starting the car cold. Stays until the motor is @ OT & I've run it down the road a bit. So is it:

1.) Bent valve?
2.) Typical valve lash for a motor with 77,000 miles on it?
3.) Typical for the '04 STi when it's really - really - really cold out?

A subjective question, but I'm polling the mob..
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Old 02-05-07, 06:22 PM   #2
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I was going to ask the same thing...my car does that too...its an 06 with 10k
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Old 02-05-07, 06:28 PM   #3
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Quote:
Originally Posted by subyguy14
I was going to ask the same thing...my car does that too...its an 06 with 10k
I searched, didn't find any threads that talked about very cold weather warm up.
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Old 02-05-07, 06:28 PM   #4
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probably #3

0 degrees start-up noise?
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Old 02-05-07, 06:30 PM   #5
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Quote:
Originally Posted by IndySTi
Temps here in Hoosier land (home of the Super Bowl Champs) has been in the single digits past week or so.

I seem to hear a tic from the right side starting the car cold. Stays until the motor is @ OT & I've run it down the road a bit. So is it:

1.) Bent valve?
2.) Typical valve lash for a motor with 77,000 miles on it?
3.) Typical for the '04 STi when it's really - really - really cold out?

A subjective question, but I'm polling the mob..
How does it run?
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Old 02-05-07, 06:34 PM   #6
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Quote:
Originally Posted by 520hpSTi
Didn't see that one, thanks and sorry. Mine whines too, but the knock bothered me. Had an LS1 Chevy that did it too ~ that WAS a bent pushrod.

Motor gets rebuilt or replaced @ 100K anyway.
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Old 02-05-07, 06:36 PM   #7
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Quote:
Originally Posted by polyol
How does it run?
Don't run it hard while cold. Runs strong after warm up. I'm being a hypochondriac.
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Old 02-05-07, 06:45 PM   #8
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Quote:
Originally Posted by IndySTi
Don't run it hard while cold. Runs strong after warm up. I'm being a hypochondriac.
Welcome to STi ownership...lots of strange noises...still runs strong!
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Old 02-05-07, 07:12 PM   #9
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don't push it when its cold. let the car warm up. I dont know if you ahve an oil temp gauge, but be aware that oil temp can lag coolant temp by several minutes. give it a few even after coolant temp stabilizes.(sp?)

probably the tappets/lifters

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Old 02-05-07, 07:36 PM   #10
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Totally normal. If you install a block heater, you'd never hear it. And if you think your's is noisy, let me tell you: a built block with loose forged pistons would scare the piss out of you. Mine sounds like an old diesel at cold start in those kind of temps.

And, Don's advice to give it a little more time to warm up is right on the money. A good rule of thumb (assuming no oil temp guage) is to keep it below 3K until double the time/miles it takes for the water to hit stable temps. Oil takes quite a bit longer to get to normal temps than water.
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