Is it a normal cold engine noise?
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Is it a normal cold engine noise?
Info:
I might be obsessing too much over it but I'm concern about this slapping/knocking sound that is present for a short moment when the engine is cranking, but b/f it it fired up. This noise disappears as soon as the engine fires up. This knocking sound is pretty intrussive - it is best heard on the second start.
The car is 03 Z06 with <5K miles on it. Oil has been changed less than 1000 miles ago and at normal level
It is only present when the abmbient temperature is cool (<60).
Here is how it sounds at ambient temp of 85 degrees.
Engine at 85 degrees
Engine at 55 degrees
Pay close attention to the second start during cold weather - that is when the knocking is most noticeable
[Modified by PeterK, 1:08 PM 10/22/2003]
I might be obsessing too much over it but I'm concern about this slapping/knocking sound that is present for a short moment when the engine is cranking, but b/f it it fired up. This noise disappears as soon as the engine fires up. This knocking sound is pretty intrussive - it is best heard on the second start.
The car is 03 Z06 with <5K miles on it. Oil has been changed less than 1000 miles ago and at normal level
It is only present when the abmbient temperature is cool (<60).
Here is how it sounds at ambient temp of 85 degrees.
Engine at 85 degrees
Engine at 55 degrees
Pay close attention to the second start during cold weather - that is when the knocking is most noticeable
[Modified by PeterK, 1:08 PM 10/22/2003]
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St. Jude Donor '12
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Re: Is it a normal cold engine noise? (PeterK)
I've stopped by the dealer and they said that this is all totally normal. Not that I don't trust them, but they once told me that an overfilled rear differential can leack for up to 36 month and 36K miles and it is normal.
Pro
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Re: Is it a normal cold engine noise? (PeterK)
hmm,mine actually is much worse than that.
you can hear mine from quiet a distance.
I will know more about it mnday when i get a diagnosis from David at TJC.
you can hear mine from quiet a distance.
I will know more about it mnday when i get a diagnosis from David at TJC.
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Re: Is it a normal cold engine noise? (pwrshhftd)
Well, I've recorded it on laptop seating in the cabin.. So what you hear is pretty muffled.
People have already asked me if the car is alright because it sound kind of strange.
[Modified by PeterK, 1:34 PM 10/22/2003]
People have already asked me if the car is alright because it sound kind of strange.
hmm,mine actually is much worse than that.
you can hear mine from quiet a distance.
I will know more about it mnday when i get a diagnosis from David at TJC.
you can hear mine from quiet a distance.
I will know more about it mnday when i get a diagnosis from David at TJC.
[Modified by PeterK, 1:34 PM 10/22/2003]
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Re: Is it a normal cold engine noise? (Dr.Ron)
Almost sound like when your starter is bad & the car doesn't crank,just clicks... :lurk:
Do you think my battery can be weak?
Burning Brakes
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Re: Is it a normal cold engine noise? (PeterK)
Almost sound like when your starter is bad & the car doesn't crank,just clicks... :lurk:
Hmm,
Do you think my battery can be weak?
Hmm,
Do you think my battery can be weak?
Since the 2nd cold start sounded slower (almost didn't start sounding), checking for a weak/bad battery, dirty post contacts, alternator, etc., is a good first guess. The starter solenoid contacts could also be dirty.
A potential source of the noise is the starter solenoid being actuated by the key wiring path, which sends current to the electromagnet in the starter. This pulls the solenoid to engage high amp contacts to run the starter motor. With a weak battery system, the loss of current to run the starter motor causes the electromagnet to lose power, and spring back, cutting the starter motor. Once this happens, there is now enough electromagnet power to re-engage the starter contacts. This cycle occurs rapidly, making noise.
Otherwise, your engine sounds great, nice and smooth and quiet.
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Re: Is it a normal cold engine noise? (PeterK)
PeterK
Nice job on the recordings! Very professional! :thumbs:
I would have to agree that it sounds like a solonid or internal starter problem. Could be a bendix that is weak ot excessively loose.
So,,, the service guy says it normal! :rolleyes: :skep:
If I were you I would ask the dealer to crank up one of his new Vetts on the lot and see if it makes the same noise. I dont think he will want to compare them.
Honestly, I would tell him that you think it is an abnormal noise and ask him to replace the starter. If he wont, ask to speak to the service manager about it. If he wont play ask to speak to the Distric Service Rep.
He(( its only a starter! It's not like your asking for a new engine or drive train! :D
Bill C
Nice job on the recordings! Very professional! :thumbs:
I would have to agree that it sounds like a solonid or internal starter problem. Could be a bendix that is weak ot excessively loose.
So,,, the service guy says it normal! :rolleyes: :skep:
If I were you I would ask the dealer to crank up one of his new Vetts on the lot and see if it makes the same noise. I dont think he will want to compare them.
Honestly, I would tell him that you think it is an abnormal noise and ask him to replace the starter. If he wont, ask to speak to the service manager about it. If he wont play ask to speak to the Distric Service Rep.
He(( its only a starter! It's not like your asking for a new engine or drive train! :D
Bill C
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Re: Is it a normal cold engine noise? (Bill Curlee)
To me it sounds like the Bindex in the starter or the solenoid. This not your average starter, its high speed high torque. So when its cold out it has to labor a little more to get the job done. Generally an electrical problem such as loose ground would rear its ugly head even when warm. It would be an easy change for the dealer. Hope this helps. :cheers:
[Modified by dubya, 5:27 PM 10/22/2003]
[Modified by dubya, 5:27 PM 10/22/2003]
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Re: Is it a normal cold engine noise? (Bill Curlee)
Wow, I always appriciate how quickly and intelegentlly this forum reponds.
So since it is not engine related - I'm gonna wait until the situation becomes worse. I presume that I'm not under any major risk?
Thanks
So since it is not engine related - I'm gonna wait until the situation becomes worse. I presume that I'm not under any major risk?
Thanks
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Re: Is it a normal cold engine noise? (PeterK)
Peter
I would take it in and make your complaint known! Get it on paper as to the severity of the problem when it ocurrs and what causes it.
If it get worse you have documented evidence of that and it will make a better case for replacement.
The noise is not normal and very distinct! If they say it normal take it to another dealer and get a second opinion.
Please keep us informed on how it turns out
Good luck!
Bill C
I would take it in and make your complaint known! Get it on paper as to the severity of the problem when it ocurrs and what causes it.
If it get worse you have documented evidence of that and it will make a better case for replacement.
The noise is not normal and very distinct! If they say it normal take it to another dealer and get a second opinion.
Please keep us informed on how it turns out
Good luck!
Bill C
Burning Brakes
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From: La Jolla, CA
Re: Is it a normal cold engine noise? (PeterK)
Wow, I always appriciate how quickly and intelegentlly this forum reponds.
So since it is not engine related - I'm gonna wait until the situation becomes worse. I presume that I'm not under any major risk?
Thanks
So since it is not engine related - I'm gonna wait until the situation becomes worse. I presume that I'm not under any major risk?
Thanks
Melting Slicks
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Re: Is it a normal cold engine noise? (PeterK)
Wow, I always appriciate how quickly and intelegentlly this forum reponds.
So since it is not engine related - I'm gonna wait until the situation becomes worse. I presume that I'm not under any major risk?
Thanks
So since it is not engine related - I'm gonna wait until the situation becomes worse. I presume that I'm not under any major risk?
Thanks
Pete, I wouldn't wait. Bring those audio clips into the dealer and request a starter change-out under warranty. This would not take the dealer long to do and would give some piece of mind to all parties involved. At the least I would get something signed from the dealer stating they have heard your concerns. And Then I would find a new dealer. Even if you have to drive several hundred miles. Then I would write a certified letter to GM stating your concerns about the certified GM dealer. Just my .02. Hope this helps.
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Re: Is it a normal cold engine noise? (dubya)
Wow, I always appriciate how quickly and intelegentlly this forum reponds.
So since it is not engine related - I'm gonna wait until the situation becomes worse. I presume that I'm not under any major risk?
Thanks
Pete, I wouldn't wait. Bring those audio clips into the dealer and request a starter change-out under warranty. This would not take the dealer long to do and would give some piece of mind to all parties involved. At the least I would get something signed from the dealer stating they have heard your concerns. And Then I would find a new dealer. Even if you have to drive several hundred miles. Then I would write a certified letter to GM stating your concerns about the certified GM dealer. Just my .02. Hope this helps.
So since it is not engine related - I'm gonna wait until the situation becomes worse. I presume that I'm not under any major risk?
Thanks
Pete, I wouldn't wait. Bring those audio clips into the dealer and request a starter change-out under warranty. This would not take the dealer long to do and would give some piece of mind to all parties involved. At the least I would get something signed from the dealer stating they have heard your concerns. And Then I would find a new dealer. Even if you have to drive several hundred miles. Then I would write a certified letter to GM stating your concerns about the certified GM dealer. Just my .02. Hope this helps.
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Re: Is it a normal cold engine noise? (PeterK)
Man that really sucks. My local dealer would have had it changed out already and would have thrown in a few free oil changes. That really sucks. :mad
Find a new dealer. Good luck on this one.
Find a new dealer. Good luck on this one.
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St. Jude Donor '12
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Re: Is it a normal cold engine noise? (dubya)
Well, I've tried ALL San Antonio GM dealers (all five of them) at one point or another and I'm not on speaking terms with most of them.
So I'm kind of SOL here, I guess I'll have to wait until it breaks down.
So I'm kind of SOL here, I guess I'll have to wait until it breaks down.
Man that really sucks. My local dealer would have had it changed out already and would have thrown in a few free oil changes. That really sucks. :mad
Find a new dealer. Good luck on this one.
Find a new dealer. Good luck on this one.
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Re: Is it a normal cold engine noise? (PeterK)
It is truly amazing that every noise is always "normal" according to a dealer. Keep pressing the issue - it is not normal.
