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Old 10-01-2016, 12:19 AM   #1
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Default Weird *** electrical beep/buzz

I have no clue what is going on here. Someone smarter than me please help.

Video one I can unplug one of the coils and the beep/buzz stops. After a certain amount of time it stops. Then I realized it matches a wried *** thing the wideband is doing video two. Sorry didn't realize the alarm next door was drowning it out but you can still hear the beep/buzz.


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Old 10-01-2016, 07:40 AM   #2
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The AEM gauge does buzz a little, I can definitely hear on my quiet workbench, although I don't expect to be able to hear it in a car.

Does the engine bay noise stop if you disconnect the idle valve?
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Old 10-01-2016, 10:01 AM   #3
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Originally Posted by Reverant View Post
The AEM gauge does buzz a little, I can definitely hear on my quiet workbench, although I don't expect to be able to hear it in a car.

Does the engine bay noise stop if you disconnect the idle valve?
No idle valve
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Old 10-03-2016, 03:58 PM   #4
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The PWM heater for the AEM puts a **** ton of noise on the ground/power for the car. It is about 1A worth.

Your coil is ringing from that (coil of wire = electro magnet = speaker). My head unit did the same thing in mine. The actual head unit, with all the speakers disconected, would ring.

Connect a 2200uF (or bigger) 25V (or more) capacitor between the power and ground lines for the AEM. It should greatly lower the noise.
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Old 10-04-2016, 10:34 AM   #5
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Originally Posted by x_25 View Post
The PWM heater for the AEM puts a **** ton of noise on the ground/power for the car. It is about 1A worth.

Your coil is ringing from that (coil of wire = electro magnet = speaker). My head unit did the same thing in mine. The actual head unit, with all the speakers disconected, would ring.

Connect a 2200uF (or bigger) 25V (or more) capacitor between the power and ground lines for the AEM. It should greatly lower the noise.
I found a missing ground wire that goes from the coil plug to the intake manifold. The tone is now barely audible and from what you said sounds like that's ok.
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Old 10-04-2016, 10:38 AM   #6
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Missing ground there would do it too. Although the AEM is still dumping ton's of noise. I would reccomend the cap anyway to make sure itndoesn't cause any problems with other sensors or whatnot.
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Old 10-04-2016, 10:56 AM   #7
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Missing ground there would do it too. Although the AEM is still dumping ton's of noise. I would reccomend the cap anyway to make sure itndoesn't cause any problems with other sensors or whatnot.
Thanks I will get 2 caps and install them.
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