My carter fuel pump i SO QUIET now, then i found a new noise, wtf?
10-18-07, 10:50 PM
#1
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My carter fuel pump i SO QUIET now, then i found a new noise, wtf?
Okay, i posted this in the audio section of this site, but i think i might get more exposure and help if link to it in this section. Here is text from the other post:
Okay, let me break it down.
I recently did what i call operation quiet my carter fuel pump, so, now the fuel pump is dead silent (almost) and i found a new noise because i cant hear the fuel pump anymore.
Weird, actually; whine noise comes from the left tweeter only when the car is running and the stereo is off, WTF?
When the car is running and the stereo is on, there is no noise in any speaker.
Even with the stereo on and the cd player on pause or mute there is no noise, only when the stereo is turned off and the noise does not appear change or respond to engine RPM.
FWIW i have a central grounding bolt for all of the audio gear.
All of the audio cables (speaker and RCA's) are not next to any power wires.
The stereo is in my 84 GSL
The stereo consists of:
Clarion DXZ845MC head unit
Clarion APA2200 2 channel amplifier (for the mids and highs)
Rockford Fosgate 250a2 amplifier (for the sub)
Rockford Fosgate 8" sub in the rear
MB Quart 3 way component system
4 Gauge wire to a fused distribution block,
Then separate 8 gauge runs to the amps and head unit
Again, all grounds including the head unit are at a central grounding bolt
All new 12 gauge wire to all speakers
All connections are soldered
Oh and a MSD 6A ignition box (dont know if it matters)
This is driving me nuts, not because i sit and listen for noises when my car is idiling, but because it seems something isnt right.
Also, on a side note, i dont cut corners and installed everything myself properly, but i am no expert, what the heck is going on?
Please help, any input would be great!
I recently did what i call operation quiet my carter fuel pump, so, now the fuel pump is dead silent (almost) and i found a new noise because i cant hear the fuel pump anymore.
Weird, actually; whine noise comes from the left tweeter only when the car is running and the stereo is off, WTF?
When the car is running and the stereo is on, there is no noise in any speaker.
Even with the stereo on and the cd player on pause or mute there is no noise, only when the stereo is turned off and the noise does not appear change or respond to engine RPM.
FWIW i have a central grounding bolt for all of the audio gear.
All of the audio cables (speaker and RCA's) are not next to any power wires.
The stereo is in my 84 GSL
The stereo consists of:
Clarion DXZ845MC head unit
Clarion APA2200 2 channel amplifier (for the mids and highs)
Rockford Fosgate 250a2 amplifier (for the sub)
Rockford Fosgate 8" sub in the rear
MB Quart 3 way component system
4 Gauge wire to a fused distribution block,
Then separate 8 gauge runs to the amps and head unit
Again, all grounds including the head unit are at a central grounding bolt
All new 12 gauge wire to all speakers
All connections are soldered
Oh and a MSD 6A ignition box (dont know if it matters)
This is driving me nuts, not because i sit and listen for noises when my car is idiling, but because it seems something isnt right.
Also, on a side note, i dont cut corners and installed everything myself properly, but i am no expert, what the heck is going on?
Please help, any input would be great!
10-19-07, 01:47 AM
#3
interference is usually about right ... better insulated wires and better grounding usually takes care of things the depending what you have powering your speakers, when you turn on the radio, it might actually activate a ground relay or something somewhere...
10-19-07, 09:01 AM
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Huh, well that sucks. I dont have another tweeter to check to see if thats it, but again it doesnt emit noise when the stereo is on.
Perhaps i will try a new run of better speaker wire to that tweeter. Maybe its all of the electronic crap and wires that run underneath the dash on the driver's side thats doing it.
Thanks guys, oh and for the record i have had no replies in the AV section, lol
Perhaps i will try a new run of better speaker wire to that tweeter. Maybe its all of the electronic crap and wires that run underneath the dash on the driver's side thats doing it.
Thanks guys, oh and for the record i have had no replies in the AV section, lol
10-19-07, 10:43 AM
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10-19-07, 09:52 PM
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Well, upon closer inspection it turns out the noise is coming through when the stereo is on and off 
And its also coming from both front speakers
I went crazy with soft rubber bushings on my fuel pump. I know i will have to go back to the hardware shop where i bought the bushings, when i do i will take a pic of the ones i used. I am seriously blown away by the difference in sound. No more whine or buzz from the Carter, woo hoo!
Basically there is not a single piece of metal touching metal with the fuel pump. And all six of the bushings i used were about one inch thick and securely gripped the bracket of the fuel pump from the inside of the mounting hole. Again pictures are worth a million words here, i will try to get pics.
And its also coming from both front speakers
I went crazy with soft rubber bushings on my fuel pump. I know i will have to go back to the hardware shop where i bought the bushings, when i do i will take a pic of the ones i used. I am seriously blown away by the difference in sound. No more whine or buzz from the Carter, woo hoo!
Basically there is not a single piece of metal touching metal with the fuel pump. And all six of the bushings i used were about one inch thick and securely gripped the bracket of the fuel pump from the inside of the mounting hole. Again pictures are worth a million words here, i will try to get pics.
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10-20-07, 02:09 AM
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try shielded cable to the speakers.also put in a Noise filter on your Power(positive and illumination/memory )Wires.this may catch any noise created by the alternator. or the ignition system.,check also to see that the Speakers are not just One wire.that they indeed go as Two wires POS/Neg to the Deck.That would eliminate any chance of Interference as the body is not being used as ground.Try to bypass any of the normal Stereo Switched wires,and see if you can hook to another source of Switched power.it may help also.
10-20-07, 05:58 AM
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What spark plug wires are you using? Also, there is at least one condensor on the engine which is (I believe) supposed to reduce this issue so you might check that while you're at it...
10-20-07, 09:04 AM
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i had something like that in a car and it was just a lose ground connection..... also it would get louder when you speed up.... grounds do some of the most unexplainable things........ so good luck thats just what i think
10-20-07, 04:22 PM
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Directfreak, my bushings are much much different, though your fuel delivery seems to be more than efficient 
So here is where i ended up today; I moved the crossovers that were inside the dash underneath the head unit and that solved my noise issue while the stereo is off.
But the noise still continues to come through when the stereo is turned on.
I unplugged the main amp from the head unit and the noise went away. That means my amp and the routing of my RCA and speaker cables is good i presume, yes no?
I am guessing now that the head unit is receiving or picking up (or even giving off) some kind of noise.
Someone else have a better idea? Please, i am at a loss.
So here is where i ended up today; I moved the crossovers that were inside the dash underneath the head unit and that solved my noise issue while the stereo is off.
But the noise still continues to come through when the stereo is turned on.
I unplugged the main amp from the head unit and the noise went away. That means my amp and the routing of my RCA and speaker cables is good i presume, yes no?
I am guessing now that the head unit is receiving or picking up (or even giving off) some kind of noise.
Someone else have a better idea? Please, i am at a loss.
10-21-07, 02:21 PM
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Sounds like a grounding problem to me. To test you could try hookind up a temp ground wire from the case of the deck to the ground of the mid tweet amp. If that kills or makes the noise worse then you will have a direction to go. Also where is the head unit grounded? I worked installing for 22 years so have seen this issue many times.
10-21-07, 02:39 PM
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Sounds like a grounding problem to me. To test you could try hookind up a temp ground wire from the case of the deck to the ground of the mid tweet amp. If that kills or makes the noise worse then you will have a direction to go. Also where is the head unit grounded? I worked installing for 22 years so have seen this issue many times.
Okay, so if i was to try that route, i understand hooking a ground wire to the chassis of the head unit, then do i take that wire and run it to the ground terminal on the amplifier?
Just want to be sure this is what you are talking about.
I had heard this might help and it was going to be my next step, i just want to make sure i am doing it right.
10-21-07, 03:39 PM
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Okay, i went out to the garage after the lions won, woo hoo!
But i was not successful.
I tried running a wire from the chassis of the head unit to the ground terminal on the amp, made no difference
I then tried moving the ground from the central star ground with both amps to somewhere inside the dash, it also made no difference.
Anymore ideas? I have heard some people talk about grounding the shield on the RCA's, is that worth a shot?
I am really at a loss.
But i was not successful.
I tried running a wire from the chassis of the head unit to the ground terminal on the amp, made no difference
I then tried moving the ground from the central star ground with both amps to somewhere inside the dash, it also made no difference.
Anymore ideas? I have heard some people talk about grounding the shield on the RCA's, is that worth a shot?
I am really at a loss.
10-21-07, 04:49 PM
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Another update;
I unplugged the RCA cables from the amp and hooked up a set of known good RCA cables and basically just ran them over the console from the head unit and to the amp.
The noise was still there UGH!
So now i definitely know that it is for sure not the RCA's and there routing.
Blaaaarg this is starting to get frustrating.
I unplugged the RCA cables from the amp and hooked up a set of known good RCA cables and basically just ran them over the console from the head unit and to the amp.
The noise was still there UGH!
So now i definitely know that it is for sure not the RCA's and there routing.
Blaaaarg this is starting to get frustrating.
10-21-07, 09:09 PM
#20
Add a small resistor in series on one of the wires on your tweeters. This will reduce the unwanted noise. You will need to compensate by cranking the high frequency up a little until it sounds balanced again.
Add the resistor to one wire or the other. It really doesn't matter as long as it's on the same wire on both tweeters.
The goal here is to attenuate the entire output as a whole from the tweeter, so not only will it cut out the dumb noise, it will end up reducing the volume of your music too. Try this as a last resort if you run out of other ideas.
As you said at the beginning of this thread, now that your fuel pump is quiet (and I know how loud Carters can be), that you can hear other sounds in your car. I'm assuming the dumb noise is fairly quiet. I don't know how big of a resistor you'll need, so just play around with it and let me know how it goes.
Add the resistor to one wire or the other. It really doesn't matter as long as it's on the same wire on both tweeters.
The goal here is to attenuate the entire output as a whole from the tweeter, so not only will it cut out the dumb noise, it will end up reducing the volume of your music too. Try this as a last resort if you run out of other ideas.
As you said at the beginning of this thread, now that your fuel pump is quiet (and I know how loud Carters can be), that you can hear other sounds in your car. I'm assuming the dumb noise is fairly quiet. I don't know how big of a resistor you'll need, so just play around with it and let me know how it goes.
10-21-07, 09:46 PM
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Add a small resistor in series on one of the wires on your tweeters. This will reduce the unwanted noise. You will need to compensate by cranking the high frequency up a little until it sounds balanced again.
Add the resistor to one wire or the other. It really doesn't matter as long as it's on the same wire on both tweeters.
The goal here is to attenuate the entire output as a whole from the tweeter, so not only will it cut out the dumb noise, it will end up reducing the volume of your music too. Try this as a last resort if you run out of other ideas.
As you said at the beginning of this thread, now that your fuel pump is quiet (and I know how loud Carters can be), that you can hear other sounds in your car. I'm assuming the dumb noise is fairly quiet. I don't know how big of a resistor you'll need, so just play around with it and let me know how it goes.
Add the resistor to one wire or the other. It really doesn't matter as long as it's on the same wire on both tweeters.
The goal here is to attenuate the entire output as a whole from the tweeter, so not only will it cut out the dumb noise, it will end up reducing the volume of your music too. Try this as a last resort if you run out of other ideas.
As you said at the beginning of this thread, now that your fuel pump is quiet (and I know how loud Carters can be), that you can hear other sounds in your car. I'm assuming the dumb noise is fairly quiet. I don't know how big of a resistor you'll need, so just play around with it and let me know how it goes.
I tried lowering the output on the tweeters via the crossover boxes and that really didnt seem to help.
Tomorrow i am going to try to lower the gains on the main amp and see if that helps any.
Really this sucks pretty bad though. I have installed quite a few stereos over the years and never had this much of a noise issue. Booooo
10-23-07, 09:02 AM
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Well, actually i was able to eliminate the noise yesterday.
What i did was use a 4 gauge wire ran from the battery to the frame of the car. Then ran another 4 gauge wire from the frame of the car to the motor.
Created a very solid ground throughout the car's chassis and the noise is gone like blammo!
What i did was use a 4 gauge wire ran from the battery to the frame of the car. Then ran another 4 gauge wire from the frame of the car to the motor.
Created a very solid ground throughout the car's chassis and the noise is gone like blammo!