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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > AUDIO/VIDEO + BLUETOOTH + Electronics/Alarm/Software > Radio Interference



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      10-20-2020, 10:53 PM   #1
flameo17
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Radio Interference

I got a 2006 330i with the base radio with no idrive and i get interference only on the FM radio. Was wondering if i could get any help in figuring out what causes it.

the interference only occurs when the engine is running and i’m either idling or have my foot on the gas. if i’m already going at speed and, while staying in gear, i completely let off the gas (closed throttle) the radio interference disappears until i put my foot back on the gas. same thing happens when in neutral except the interference comes back once the engine hits idle. i feel like it’s a grounding issue with the fuel system or throttle body but i’ve got no idea what to look for or what i need to do to fix it
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      10-21-2020, 01:45 AM   #2
ctuna
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I would try reseating the radio connectors first.
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      10-22-2020, 03:14 PM   #3
flameo17
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Quote:
Originally Posted by ctuna View Post
I would try reseating the radio connectors first.
just tried doing that, popped the radio out and took out and reset the connections and made sure the wires were seated, but it’s still the same; radio works fine in accessory mode but gets interference whenever the engine is running
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      10-27-2020, 05:29 PM   #4
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Just to add, the interference doesn’t start until around like 5 seconds after the engine is running, and it stays for a couple seconds once the engine is turned off

update: ok so the interference starts a couple seconds after the engine is running, but actually goes away immediately after the engine is turned off. the sound does not rise with engine rpms and is pretty consistent in volume and length

Last edited by flameo17; 10-27-2020 at 09:05 PM.. Reason: updating
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      10-28-2020, 08:59 AM   #5
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Has any work been done to the ignition/injector systems?
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      11-02-2020, 05:25 PM   #6
flameo17
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Quote:
Originally Posted by opjose View Post
Has any work been done to the ignition/injector systems?
not to my knowledge, but when i bought the car used, it looked like it had been sitting for a while, idk if that’s relevant
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      11-03-2020, 04:22 PM   #7
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Have you checked the condition of the engine ground strap?

Those are notorious for rusting out which could cause interference issues?
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      11-10-2020, 11:57 AM   #8
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check your earth straps
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      11-10-2020, 02:49 PM   #9
david in germany
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Ok, this will sound funny but, do you have a phone charger/ usb charger plugged into the cig lighter? If you do try unplugging it and see if the interference is still there.
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