Strange sound while warming up.
#1
Race Director
Thread Starter
Strange sound while warming up.
I have a Z51 A6 3LT car. When I start it up and for the next few minutes I get a humming/droning sound. It's almost like diode noise but lower in frequency. It sound like its coming from the right side of the car in front of the passenger seat. I don't know if you can hear it outside the car but you definitely can inside. It seems to go away once the car is warmed up for a couple of minutes.
Anyone else have this?
Anyone else have this?
#2
Team Owner
Member Since: Sep 2005
Location: Big Bend Country, TX
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St. Jude Donor '06-'07-'08-'09-'10-'11-'12-'13-'14-'15- '16-'17-‘18-‘19-'20-'21
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Have you checked ...........
The feeding tray for the mice must be empty. The humming/droning sound you hear is the surviving mice praying over their deceased . . . . . .
#4
Pro
Yep - I have same sound - - I believe it is the electric 'air pump' to supply extra air for the cats to heat up quicker. Once the cats have 'lit', the air pump shuts down - no more 'whine', and everybody is 'happy'. This is what I 'believe'... but I'm sure others will have additional wisedom on this subject.
#6
Race Director
Thread Starter
Yep - I have same sound - - I believe it is the electric 'air pump' to supply extra air for the cats to heat up quicker. Once the cats have 'lit', the air pump shuts down - no more 'whine', and everybody is 'happy'. This is what I 'believe'... but I'm sure others will have additional wisedom on this subject.
#8
Race Director
Thread Starter
I turned everything off but the engine and it still made the noise. I think it is the air pump. Just to confirm, does anyone know where the air pump lives in a C7?
#10
Team Owner
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St. Jude Donor '11-'12-'13, '16-'17-'18
I'm curious.. WTF is a "diode noise"?
#11
Race Director
Thread Starter
Ken,
I'm sure you can make me smarter but this is from the C5 service manual.
According to FSM noise problem could be:
1. loose drive pulley
2. loose mounting bolts/screws
3. worn or dirty bearings
4. faulty diode or faulty stator
I had a similar noise in my C5 and it turned out to be a faulty diode in the voltage regulator/alternator. That's why I described the sound as such.
Kevin
I'm sure you can make me smarter but this is from the C5 service manual.
According to FSM noise problem could be:
1. loose drive pulley
2. loose mounting bolts/screws
3. worn or dirty bearings
4. faulty diode or faulty stator
I had a similar noise in my C5 and it turned out to be a faulty diode in the voltage regulator/alternator. That's why I described the sound as such.
Kevin
#12
Team Owner
Member Since: Aug 2007
Location: I live my life by 2 rules. 1) Never share everything you know. 2)
Posts: 136,148
Received 2,402 Likes
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St. Jude Donor '11-'12-'13, '16-'17-'18
Ken,
I'm sure you can make me smarter but this is from the C5 service manual.
According to FSM noise problem could be:
1. loose drive pulley
2. loose mounting bolts/screws
3. worn or dirty bearings
4. faulty diode or faulty stator
I had a similar noise in my C5 and it turned out to be a faulty diode in the voltage regulator/alternator. That's why I described the sound as such.
Kevin
I'm sure you can make me smarter but this is from the C5 service manual.
According to FSM noise problem could be:
1. loose drive pulley
2. loose mounting bolts/screws
3. worn or dirty bearings
4. faulty diode or faulty stator
I had a similar noise in my C5 and it turned out to be a faulty diode in the voltage regulator/alternator. That's why I described the sound as such.
Kevin
#13
Team Owner
Member Since: Sep 2005
Location: Big Bend Country, TX
Posts: 29,114
Received 2,186 Likes
on
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St. Jude Donor '06-'07-'08-'09-'10-'11-'12-'13-'14-'15- '16-'17-‘18-‘19-'20-'21
NCM Lifetime Member
#14
Melting Slicks
I have a Z51 A6 3LT car. When I start it up and for the next few minutes I get a humming/droning sound. It's almost like diode noise but lower in frequency. It sound like its coming from the right side of the car in front of the passenger seat. I don't know if you can hear it outside the car but you definitely can inside. It seems to go away once the car is warmed up for a couple of minutes.
Anyone else have this?
Anyone else have this?
#15
Melting Slicks
Also saw a Techlink bulletin that in another model (Not Corvette) there was an exact description of the sound that was related to the Brake Booster pump which last around 20 seconds. So it could be a little longer in the Vette.