Radio Interference

flameo17 · 10-20-2020, 11:53 PM

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

ctuna · 10-21-2020, 02:45 AM

I would try reseating the radio connectors first.

flameo17 · 10-22-2020, 04:14 PM

Quote:

Originally Posted by ctuna

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

flameo17 · 10-27-2020, 06:29 PM

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

opjose · 10-28-2020, 09:59 AM

Has any work been done to the ignition/injector systems?

flameo17 · 11-02-2020, 06:25 PM

Quote:

Originally Posted by opjose

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

opjose · 11-03-2020, 05:22 PM

Have you checked the condition of the engine ground strap?

Those are notorious for rusting out which could cause interference issues?

J0K3R5 · 11-10-2020, 12:57 PM

check your earth straps

david in germany · 11-10-2020, 03:49 PM

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.

KSutherland67 · 04-25-2024, 08:19 AM

I found a post where a guy reset his radio and that did the trick so i tried and it seemed to work on mine.

10-20-2020, 11:53 PM	#1
flameo17 Registered 3 Rep 4 Posts Drives: 2006 330i Join Date: Oct 2020 Location: California iTrader: (0)	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, 02:45 AM	#2
ctuna Lieutenant General 2045 Rep 13,359 Posts Drives: 325xi 06 wagon MT Join Date: Jan 2010 Location: Santa Cruz, Ca iTrader: (0)	I would try reseating the radio connectors first.
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10-27-2020, 06:29 PM	#4
flameo17 Registered 3 Rep 4 Posts Drives: 2006 330i Join Date: Oct 2020 Location: California iTrader: (0)	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 10:05 PM.. Reason: updating
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10-28-2020, 09:59 AM	#5
opjose Major 244 Rep 1,373 Posts Drives: 335xi Join Date: May 2016 Location: Md iTrader: (0)	Has any work been done to the ignition/injector systems?
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11-03-2020, 05:22 PM	#7
opjose Major 244 Rep 1,373 Posts Drives: 335xi Join Date: May 2016 Location: Md iTrader: (0)	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, 12:57 PM	#8
J0K3R5 Lieutenant 418 Rep 411 Posts Drives: BMW Join Date: Oct 2016 Location: In a deep hole iTrader: (0)	check your earth straps __________________ Help yourself Software part II, read post 1 : https://www.e90post.com/forums/showt...7#post27890067
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11-10-2020, 03:49 PM	#9
david in germany Lieutenant Colonel 732 Rep 1,819 Posts Drives: 118i, 335i and 328i Join Date: Nov 2011 Location: Mannheim Germany iTrader: (2)	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. __________________ 2009 118i Monaco Blue "Maximillion" 2009 335i Saphire Black M Sport "Leopold" Cobb stage 2 aggressive tune, Mishimoto FMIC, Cobb charge pipe, Cobb catted down pipes, Forge diverter valves, BMS inlets and DCI, Cyba scoops and M Individual Audio retrofit and M3 gauge cluster retrofit. 2011 328i Titan Silver M Sport "Franzel" <--Wife's car
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04-25-2024, 08:19 AM	#10
KSutherland67 Registered 0 Rep 3 Posts Drives: '13 335iXdrive, MB CLA250 Join Date: Apr 2021 Location: Greenwood, IN iTrader: (0)	I found a post where a guy reset his radio and that did the trick so i tried and it seemed to work on mine.
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