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Old 01-08-2011, 02:56 PM   #1
Nathan
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Default engine whine thru speakers

ok i suddenly developed the usual engine wine thru my speakers. it was fine for years and just suddenly started for some reason. i checked the grounds and they are all good. and it does not do it all the time. i start the car and its fine for 5-10 min then stars to whine for a few min then stops then come back. thought it may be my deck so i swapped it out and was find for a few days then started again. and i noticed yesterday that it only does it when im idling. when i am driving it is fine but if i come up to a red light and my rpms drop it starts again but goes a way a bit if i rev it up. seems that the higher the rpms the quieter it is and eventually stops. any ideas?
all i have is a aftermarket deck hooked to the stock speakers with the stock amps.
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Old 01-08-2011, 02:59 PM   #2
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i am leaning towards you altenater.if the grounds are good then the internal ground in the altnater is shot
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Old 01-08-2011, 03:11 PM   #3
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Originally Posted by funkystang View Post
i am leaning towards you altenater.if the grounds are good then the internal ground in the altnater is shot
that was my next guess. ill have to go in and get it checked sometime next week.
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Old 01-08-2011, 03:12 PM   #4
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Could be a loose ground fuck I've had this happen plenty of times to me FML
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Old 01-08-2011, 04:27 PM   #5
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Could be a loose ground
x2
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Old 01-08-2011, 05:58 PM   #6
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i checked all the grounds. all of them are good
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Old 01-09-2011, 09:52 AM   #7
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might need a ground-loop isolator between the deck and amp(s)..
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Old 01-09-2011, 10:53 AM   #8
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Just for shits and giggles, check the plug leads, distributor contacts, and rotor. If one or more show pitting, wear, or loose contact, that can also cause RFI...
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Old 01-09-2011, 11:38 AM   #9
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Originally Posted by Blue_coyote View Post
Just for shits and giggles, check the plug leads, distributor contacts, and rotor. If one or more show pitting, wear, or loose contact, that can also cause RFI...
i would if i had them
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Old 01-09-2011, 11:44 AM   #10
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i would if i had them
No plug leads? Running a diesel or something?
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Old 01-09-2011, 12:52 PM   #11
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if you mean spark plug wires then nope. no dist or rotor. cop ftl
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Old 01-09-2011, 01:19 PM   #12
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Quote:
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if you mean spark plug wires then nope. no dist or rotor. cop ftl
Then make sure THOSE are all buttoned up snug. The noise that comes through the stereo is obviously RFI, which means you've got SOMETHING loose and causing it...
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Old 02-06-2011, 08:50 PM   #13
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Plug wires will induce a different sound into the stereo system. It's more of a ticking sound, it's constant and does not fluctuate with engine RPM.

There is a capacitor of a sorts on the alternator that's designed to reduce or eliminate noise. This part most likely needs replacing... or the problem lies in the stock amplifiers.
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Old 02-06-2011, 08:54 PM   #14
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it does not do it anymore. it just stopped one day
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Old 02-06-2011, 08:59 PM   #15
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just wait... It'll do it again
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Old 02-06-2011, 11:04 PM   #16
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Quote:
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just wait... It'll do it again
im blaming you if it does lol
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Old 04-03-2011, 06:28 PM   #17
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u need a ground loop icolator
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Old 04-06-2011, 09:19 PM   #18
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You never specified what kind of stereo you have. What is the AMP rating not CCA of your battery? whats the mileage on the alternator?.. do you have a capacitor in your system?... have you removed the grounds and scuffed the mating surface for corrosion, paint, or debris?....do you notice it on wet days more than dry?
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Old 04-22-2011, 02:05 AM   #19
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ground loop icolator, will stop all noise
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Old 12-04-2011, 11:13 PM   #20
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Happened to me out of no where as well. It was my Amp power wire was routed down the same side as the RCA cable moved the power wire noise gone
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