Yep (Unless you recently ran over a cat).
81 vette moaning noise?
Thread Starter
Intermediate
Joined: Feb 2007
Posts: 33
Likes: 0
From: Baltimore MD
81 vette moaning noise?
I am in the middle of restoring my 81. I have a question. When i turn the key before starting the car there is a "moaning" noise under the hood sounds like its on the right side of the engine. It stops after 15-30 seconds. What is it? I am thinking its a fuel pump? What can I do to repair it? any idea?
Thanks guys,
Marc
Thanks guys,
Marc
Safety Car
Joined: May 2001
Posts: 3,758
Likes: 3
From: Surrey
Have you left your wallet in the glove box? The price of gas these days.....
Does everything work OK? Can you try using a large screwdriver as a stethescope & try to narrow down where it's coming from (do this late at night, the few times I've tried it a mate always visits & wants to know why I'm holding a screwdriver handle in my ear while looking confused
).
Does everything work OK? Can you try using a large screwdriver as a stethescope & try to narrow down where it's coming from (do this late at night, the few times I've tried it a mate always visits & wants to know why I'm holding a screwdriver handle in my ear while looking confused
).
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Le Mans Master
Joined: Dec 2006
Posts: 8,837
Likes: 1,028
We are not mean. We are senile. There is a difference. We are old like our cars.
If it moans, replace it or buy it a diamond ring.
Le Mans Master
Joined: Jan 2004
Posts: 8,295
Likes: 30
From: one night in Bangkok you are never lonely
First the fan motor does not turn off. It's called "flow-thru ventilation." it runs all the time when the key is turned on. That is the first thing that many of us question. Some times small mice build nests in places like fan housings and they leave all sorts of things in there to make noise. Or the fan motor is just old and needs replacing. It also could be your automatic transmission making noise. UK PAUL gave you some good advise on pin pointing the noise.
Safety Car
Joined: May 2001
Posts: 3,758
Likes: 3
From: Surrey
Mike,
As Dean suggested, it could be the blower fan. Some cooling fans we once used made a high pitched whine for a while after power up. Many would then start making a louder noise, others would start running silently (or just stop altogether). I guess a larger fan, like a blower fan, could make a deeper sound that could be described as a "moan"? Other possibilities could be that somebody has fitted an electric fuel pump & the noise is it running as it builds up pressure? Or it could be the m/c solenoid on the carb being cycled very quickly, making a rapid ticking noise that could possibly be damped by the carb body to sound like a moan. Or it could be another relay somewhere, or any one of a myriad of reasons. So try to find where it's coming from, with or without a screwdriver in your ear, or check if something isn't working that should be. With some more information somebody here might be able to help you with some constructive advice, but your initial question left you wide open! If I had a central heating problem & called a plumber to tell him that there was a moaning noise coming from one of the bedrooms I doubt if his 1st suggestion would be to bleed the radiators
Hi Dean, how's the weather in Bangkok? A couple of mate's are heading there in a week or so.
As Dean suggested, it could be the blower fan. Some cooling fans we once used made a high pitched whine for a while after power up. Many would then start making a louder noise, others would start running silently (or just stop altogether). I guess a larger fan, like a blower fan, could make a deeper sound that could be described as a "moan"? Other possibilities could be that somebody has fitted an electric fuel pump & the noise is it running as it builds up pressure? Or it could be the m/c solenoid on the carb being cycled very quickly, making a rapid ticking noise that could possibly be damped by the carb body to sound like a moan. Or it could be another relay somewhere, or any one of a myriad of reasons. So try to find where it's coming from, with or without a screwdriver in your ear, or check if something isn't working that should be. With some more information somebody here might be able to help you with some constructive advice, but your initial question left you wide open! If I had a central heating problem & called a plumber to tell him that there was a moaning noise coming from one of the bedrooms I doubt if his 1st suggestion would be to bleed the radiators
Hi Dean, how's the weather in Bangkok? A couple of mate's are heading there in a week or so.
Le Mans Master
Joined: Jan 2004
Posts: 8,295
Likes: 30
From: one night in Bangkok you are never lonely
Mike,
As Dean suggested, it could be the blower fan. Some cooling fans we once used made a high pitched whine for a while after power up. Many would then start making a louder noise, others would start running silently (or just stop altogether). I guess a larger fan, like a blower fan, could make a deeper sound that could be described as a "moan"? Other possibilities could be that somebody has fitted an electric fuel pump & the noise is it running as it builds up pressure? Or it could be the m/c solenoid on the carb being cycled very quickly, making a rapid ticking noise that could possibly be damped by the carb body to sound like a moan. Or it could be another relay somewhere, or any one of a myriad of reasons. So try to find where it's coming from, with or without a screwdriver in your ear, or check if something isn't working that should be. With some more information somebody here might be able to help you with some constructive advice, but your initial question left you wide open! If I had a central heating problem & called a plumber to tell him that there was a moaning noise coming from one of the bedrooms I doubt if his 1st suggestion would be to bleed the radiators
Hi Dean, how's the weather in Bangkok? A couple of mate's are heading there in a week or so.
As Dean suggested, it could be the blower fan. Some cooling fans we once used made a high pitched whine for a while after power up. Many would then start making a louder noise, others would start running silently (or just stop altogether). I guess a larger fan, like a blower fan, could make a deeper sound that could be described as a "moan"? Other possibilities could be that somebody has fitted an electric fuel pump & the noise is it running as it builds up pressure? Or it could be the m/c solenoid on the carb being cycled very quickly, making a rapid ticking noise that could possibly be damped by the carb body to sound like a moan. Or it could be another relay somewhere, or any one of a myriad of reasons. So try to find where it's coming from, with or without a screwdriver in your ear, or check if something isn't working that should be. With some more information somebody here might be able to help you with some constructive advice, but your initial question left you wide open! If I had a central heating problem & called a plumber to tell him that there was a moaning noise coming from one of the bedrooms I doubt if his 1st suggestion would be to bleed the radiators
Hi Dean, how's the weather in Bangkok? A couple of mate's are heading there in a week or so.
Good advise given as always.
Weather is starting to warm up again(32+ days) But no rain and great night temps.
Instructor
Joined: Jan 2007
Posts: 109
Likes: 0
From: Erin NY
I am in the middle of restoring my 81. I have a question. When i turn the key before starting the car there is a "moaning" noise under the hood sounds like its on the right side of the engine. It stops after 15-30 seconds. What is it? I am thinking its a fuel pump? What can I do to repair it? any idea?
Thanks guys,
Marc
Thanks guys,
Marc
Hope it helps.
Le Mans Master
Joined: Jan 2007
Posts: 8,050
Likes: 3,345
From: Omaha NE
2025 c3 ('74-'82) of the Year Finalist - Unmodified
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The first time I heard a moaning Chevy blower motor was in my Dad's '68 Impala............a long time ago 
Melting Slicks
Joined: Dec 2006
Posts: 2,483
Likes: 1
From: Bay Area CA
Guys..
I was joking about you being mean.
You guys are extremely helpful and I have found so much valuable information about C3's on this forum than what I have learned from Chilton or Hanes.
I was joking about you being mean.
You guys are extremely helpful and I have found so much valuable information about C3's on this forum than what I have learned from Chilton or Hanes.
We are not trying to be rude to you but your question is difficult to analyze as there are many things that can make noise under the hood.
First the fan motor does not turn off. It's called "flow-thru ventilation." it runs all the time when the key is turned on. That is the first thing that many of us question. Some times small mice build nests in places like fan housings and they leave all sorts of things in there to make noise. Or the fan motor is just old and needs replacing. It also could be your automatic transmission making noise. UK PAUL gave you some good advise on pin pointing the noise.
First the fan motor does not turn off. It's called "flow-thru ventilation." it runs all the time when the key is turned on. That is the first thing that many of us question. Some times small mice build nests in places like fan housings and they leave all sorts of things in there to make noise. Or the fan motor is just old and needs replacing. It also could be your automatic transmission making noise. UK PAUL gave you some good advise on pin pointing the noise.