Radio Interference
Question:
I know that nobody listens to AM radio anymore, but when I try to tune in AM to listen to a baseball game, all of the stations have horrible static, interference. Didn’t always have this problem but now I do. Anybody out there experienced the same thing and have an idea as how to fix? FM & CD are perfectly clear. This is the standard AM/FM/CD unit that came in the 2000 323i sedan.
Response:
Unfortunately, AM radios pick up all kinds of interference from you engine. The two main culprits are the ignition system and the charging system. The alternator will cause a whine and the ignition will produce a rapid ticking sound. Both increase with engine speed. When did the problem first occur? Had you done any maintenance right before the problem started? If so, things like spark plugs & ignition wires may be causing your noise. Most European cars use ignition wires with resistors built into the ends. Check resistance with an Ohm meter and compare to the spec on the wire end. Old wires may have degraded resistors or even new low quality wires can cause a noise problem. If your problem is truly just static, the problem may be with the radio/antenna system. Make sure the antenna is fully extended and securely connected and the head unit is properly grounded. Good luck R. Scott McKernon Store Manager Olympic Auto Parts 9136 Gaither Rd Gaithersburg, MD 20874 1-800-472-9360 www.olyparts.com
– Hide quoted text — Show quoted text -> I know that nobody listens to AM radio anymore, but when I try to tune in AM > to listen to a baseball game, all of the stations have horrible static, > interference. Didn’t always have this problem but now I do. > Anybody out there experienced the same thing and have an idea as how to fix? > FM & CD are perfectly clear. This is the standard AM/FM/CD unit that came > in the 2000 323i sedan.
Response:
I’m taking me new M5 in for service with the same complaint. The reception of the"All News" AM station that I like to listen to is soooooooo bad that it fades and crackles when I drive down into a small valley in the road. It was way better on my 87 325, and in any of the 4 other cars I have. I think the problem is the crappy imbedded antenna – hopefully there is something wrong with it and not something that can’t be fixed. I’ll post again when I get some results.
– Hide quoted text — Show quoted text -> I know that nobody listens to AM radio anymore, but when I try to tune in AM > to listen to a baseball game, all of the stations have horrible static, > interference. Didn’t always have this problem but now I do. > Anybody out there experienced the same thing and have an idea as how to fix? > FM & CD are perfectly clear. This is the standard AM/FM/CD unit that came > in the 2000 323i sedan.
Response:
All true but not likely in this case. Engine RFI is very different from reception quality, and any vehicle built in the last 10-15 years will have this problem under control (unless something was changed). Failure is unlikely, as resistor failure will fail on the side of safety, meaning that there would be NO signal (or power or RF) if the resistor failed. The most common problem is with the nature of the in-glass antennae and the related signal path/amps/etc.
– Hide quoted text — Show quoted text -> Unfortunately, AM radios pick up all kinds of interference from you engine. > The two > main culprits are the ignition system and the charging system. The > alternator will cause > a whine and the ignition will produce a rapid ticking sound. Both increase > with engine > speed. > When did the problem first occur? Had you done any maintenance right before > the > problem started? If so, things like spark plugs & ignition wires may be > causing your noise. > Most European cars use ignition wires with resistors built into the ends. > Check resistance > with an Ohm meter and compare to the spec on the wire end. Old wires may > have degraded > resistors or even new low quality wires can cause a noise problem. > If your problem is truly just static, the problem may be with the > radio/antenna system. > Make sure the antenna is fully extended and securely connected and the head > unit is properly > grounded. > Good luck > R. Scott McKernon > Store Manager > Olympic Auto Parts > 9136 Gaither Rd > Gaithersburg, MD 20874 > 1-800-472-9360 > www.olyparts.com > I know that nobody listens to AM radio anymore, but when I try to tune in > AM > to listen to a baseball game, all of the stations have horrible static, > interference. Didn’t always have this problem but now I do. > Anybody out there experienced the same thing and have an idea as how to > fix? > FM & CD are perfectly clear. This is the standard AM/FM/CD unit that came > in the 2000 323i sedan.
Response:
> I know that nobody listens to AM radio anymore, but when I try to tune in AM > to listen to a baseball game, all of the stations have horrible static, > interference. Didn’t always have this problem but now I do. > Anybody out there experienced the same thing and have an idea as how to fix? > FM & CD are perfectly clear. This is the standard AM/FM/CD unit that came > in the 2000 323i sedan.
Antenna Pre-Amp. Or, a crack in the diversity antenna. I unfortunately had a similar problem with my ‘01 330xi’s am/fm/cd; fix was a new unit (under warranty, thank goodness.) This is a very common problem with BMW’s radio. BTW, have you ever noticed that the AST/DSC interferes with the AM? This won’t change even if you get your problem fixed. Floyd
Response:
> I know that nobody listens to AM radio anymore, but when I try to tune in AM > to listen to a baseball game, all of the stations have horrible static, > interference. Didn’t always have this problem but now I do. > Anybody out there experienced the same thing and have an idea as how to fix? > FM & CD are perfectly clear. This is the standard AM/FM/CD unit that came > in the 2000 323i sedan.
I had a problem with the antenna connector at the radio. The center conductor wasn’t connected, just close. Enough for FM to couple across, but not AM. I just had to put a new connector on. John
Response:
> I know that nobody listens to AM radio anymore, but when I try to tune in AM > to listen to a baseball game, all of the stations have horrible static, > interference. Didn’t always have this problem but now I do. > Anybody out there experienced the same thing and have an idea as how to fix? > FM & CD are perfectly clear. This is the standard AM/FM/CD unit that came > in the 2000 323i sedan.
RFI interference was apparently a common problem on early E46 models. The fix for my ‘99 328i was a warranty replacement of the antenna amp. However, my problem was moderate interference – a rev related whine which was noticeable only at low engine speeds as when idling at a stoplight. Good luck! Tom
Response:
I learned the hard way that tinting a window that contains the antenna can seriously limit the antenna’s performance. Most commercial films are metallic, and will affect AM radio. I switched from metallic to non-metallic and the results were improved reception. I live in a rural area and our AM reception is poor to begin with, but with the metallic film is was next to nothing.
– Hide quoted text — Show quoted text -> I know that nobody listens to AM radio anymore, but when I try to tune in AM > to listen to a baseball game, all of the stations have horrible static, > interference. Didn’t always have this problem but now I do. > Anybody out there experienced the same thing and have an idea as how to fix? > FM & CD are perfectly clear. This is the standard AM/FM/CD unit that came > in the 2000 323i sedan.
Response:
> I know that nobody listens to AM radio anymore, but when I try to tune > in AM to listen to a baseball game, all of the stations have horrible > static, interference. Didn’t always have this problem but now I do. > Anybody out there experienced the same thing and have an idea as how > to fix? > FM & CD are perfectly clear. This is the standard AM/FM/CD unit that > came in the 2000 323i sedan.
If you’re still having this problem, I had similar problem on my 99 323i, and apparently it’s quite common for our cars. The noise is sensitive to speed; If you’re going slowly through a low reception area, you’ll hear click-click-click sound through the radio, the faster you go, the quicker the clicks become. if you’re going >30mph, the clicks become a constant whine. If that’s the problem you’re getting, the fix is really simple. There’s an antenna signal amplifier behind the panel of the driver-side, rear column. just pop out that cover, check all the connections to make sure they are TIGHT. Use pliers to screw in the coax cable if you have to. There’s a nice HOW-TO page on the web describing this problem with pictures and everything. I don’t have the link, but you can search for it. Good luck.
Response:
– Hide quoted text — Show quoted text -> I know that nobody listens to AM radio anymore, but when I try to tune > in AM to listen to a baseball game, all of the stations have horrible > static, interference. Didn’t always have this problem but now I do. > Anybody out there experienced the same thing and have an idea as how > to fix? > FM & CD are perfectly clear. This is the standard AM/FM/CD unit that > came in the 2000 323i sedan. > If you’re still having this problem, I had similar problem on my 99 323i, > and apparently it’s quite common for our cars. > The noise is sensitive to speed; If you’re going slowly through a low > reception area, you’ll hear click-click-click sound through the radio, > the faster you go, the quicker the clicks become. if you’re going >30mph, > the clicks become a constant whine. > If that’s the problem you’re getting, the fix is really simple. > There’s an antenna signal amplifier behind the panel of the driver-side, > rear column. just pop out that cover, check all the connections to make > sure they are TIGHT. Use pliers to screw in the coax cable if you have > to. > There’s a nice HOW-TO page on the web describing this problem with > pictures and everything. I don’t have the link, but you can search for > it. Good luck.
Same problem here with a new 03′ M5. Exactly your situation. Problem is with window tinting. If you have a tint, that’s the cause. Only cure is to put on an outside mounted antenna (yuk). – Hide quoted text — Show quoted text –
Response:
– Hide quoted text — Show quoted text ->> I know that nobody listens to AM radio anymore, but when I try to tune >> in AM to listen to a baseball game, all of the stations have horrible >> static, interference. Didn’t always have this problem but now I do. >> Anybody out there experienced the same thing and have an idea as how >> to fix? >> FM & CD are perfectly clear. This is the standard AM/FM/CD unit that >> came in the 2000 323i sedan. > If you’re still having this problem, I had similar problem on my 99 > 323i, and apparently it’s quite common for our cars. > The noise is sensitive to speed; If you’re going slowly through a low > reception area, you’ll hear click-click-click sound through the radio, > the faster you go, the quicker the clicks become. if you’re going > >30mph, the clicks become a constant whine. > If that’s the problem you’re getting, the fix is really simple. > There’s an antenna signal amplifier behind the panel of the > driver-side, rear column. just pop out that cover, check all the > connections to make sure they are TIGHT. Use pliers to screw in the > coax cable if you have to. > There’s a nice HOW-TO page on the web describing this problem with > pictures and everything. I don’t have the link, but you can search for > it. Good luck. > Same problem here with a new 03′ M5. Exactly your situation. Problem is > with window tinting. If you have a tint, that’s the cause. Only cure is > to put on an outside mounted antenna (yuk).
Could also be cause by a bad sprk plug wire or a faulty spark plug. THe nosie you describe sppears to be ingnition noise. — Panzer
Response:
- Hide quoted text — Show quoted text ->>>I know that nobody listens to AM radio anymore, but when I try to tune >>>in AM to listen to a baseball game, all of the stations have horrible >>>static, interference. Didn’t always have this problem but now I do. >>>Anybody out there experienced the same thing and have an idea as how >>>to fix? >>>FM & CD are perfectly clear. This is the standard AM/FM/CD unit that >>>came in the 2000 323i sedan. >>If you’re still having this problem, I had similar problem on my 99 >>323i, and apparently it’s quite common for our cars. >>The noise is sensitive to speed; If you’re going slowly through a low >>reception area, you’ll hear click-click-click sound through the radio, >>the faster you go, the quicker the clicks become. if you’re going >>>30mph, the clicks become a constant whine. >>If that’s the problem you’re getting, the fix is really simple. >>There’s an antenna signal amplifier behind the panel of the >>driver-side, rear column. just pop out that cover, check all the >>connections to make sure they are TIGHT. Use pliers to screw in the >>coax cable if you have to. >>There’s a nice HOW-TO page on the web describing this problem with >>pictures and everything. I don’t have the link, but you can search for >>it. Good luck. >Same problem here with a new 03′ M5. Exactly your situation. Problem is >with window tinting. If you have a tint, that’s the cause. Only cure is >to put on an outside mounted antenna (yuk). > Could also be cause by a bad sprk plug wire or a faulty spark plug. THe > nosie you describe sppears to be ingnition noise.
None of the cars being discussed in this thread have spark plug wires. -Fred W
Response:
Ditto in my ‘95 540 The interference seems directly related to electrical interference. For example, if I have and data showing in my OBC display, the interference is worse. And the interference changes with engine RPM. My guess is that something in the radio or antenna system is not grounded properly, but I’ve yet to go looking for it. Suggestions or alternate theories welcomed… –Mike (remove the teeth to send me a reply.)
– Hide quoted text — Show quoted text ->>>>I know that nobody listens to AM radio anymore, but when I try to tune >>>>in AM to listen to a baseball game, all of the stations have horrible >>>>static, interference. Didn’t always have this problem but now I do. >>>>Anybody out there experienced the same thing and have an idea as how >>>>to fix? >>>>FM & CD are perfectly clear. This is the standard AM/FM/CD unit that >>>>came in the 2000 323i sedan. >>>If you’re still having this problem, I had similar problem on my 99 >>>323i, and apparently it’s quite common for our cars. >>>The noise is sensitive to speed; If you’re going slowly through a low >>>reception area, you’ll hear click-click-click sound through the radio, >>>the faster you go, the quicker the clicks become. if you’re going >>>>30mph, the clicks become a constant whine. >>>If that’s the problem you’re getting, the fix is really simple. >>>There’s an antenna signal amplifier behind the panel of the >>>driver-side, rear column. just pop out that cover, check all the >>>connections to make sure they are TIGHT. Use pliers to screw in the >>>coax cable if you have to. >>>There’s a nice HOW-TO page on the web describing this problem with >>>pictures and everything. I don’t have the link, but you can search for >>>it. Good luck. >>Same problem here with a new 03′ M5. Exactly your situation. Problem is >>with window tinting. If you have a tint, that’s the cause. Only cure is >>to put on an outside mounted antenna (yuk). > Could also be cause by a bad sprk plug wire or a faulty spark plug. THe > nosie you describe sppears to be ingnition noise. > None of the cars being discussed in this thread have spark plug wires. > -Fred W
Response:
> None of the cars being discussed in this thread have spark plug wires. > -Fred W
I see, then these are diesels and therefore no spark plugs ?? Just checking
I assume if they have spark plugs they must connect to the ignition in some manner. Could you enlighten me as to how it is done ? I have never seen the engine in anything later than an E30. — Panzer
Response:
- Hide quoted text — Show quoted text ->None of the cars being discussed in this thread have spark plug wires. >-Fred W > I see, then these are diesels and therefore no spark plugs ?? Just checking >
I assume if they have spark plugs they must connect to the ignition in > some manner. Could you enlighten me as to how it is done ? I have never seen > the engine in anything later than an E30.
I said that hey do not have spark plug *wires*. They have the "coil on plug" configuration found in (almost) every *modern* gasoline engine design. <http://autorepair.about.com/library/glossary/bldef-110a.htm> -Fred W
Response:
> I said that hey do not have spark plug *wires*. > They have the "coil on plug" configuration found in (almost) every > *modern* gasoline engine design. ><http://autorepair.about.com/library/glossary/bldef-110a.htm> > -Fred W
Well well interesting. Thanks for the links
However it could I suppose be a faulty COP
or plug itself. Remember the first radio transmitters were nithing more than a spark plug !!
Any was just a suggestion trying to be helpful. — Panzer
Response:
- Hide quoted text — Show quoted text ->I said that hey do not have spark plug *wires*. >They have the "coil on plug" configuration found in (almost) every >*modern* gasoline engine design. ><http://autorepair.about.com/library/glossary/bldef-110a.htm> >-Fred W > Well well interesting. Thanks for the links
However it could I suppose be > a faulty COP
or plug itself. Remember the first radio transmitters were > nithing more than a spark plug !!
I agree. > Any was just a suggestion trying to be helpful.
Ditto here. I would hate for the OP to go into his mechanic and suggest he replace the spark plug wires. He would surely appear mechanically inept and a likely target to be ripped off. -Fred W
Response:
Yeah, and it could be a tumor……AM reception on BMW’s has allways been horrible. Some are better than others, but none are great.
– Hide quoted text — Show quoted text ->>I said that hey do not have spark plug *wires*. >>They have the "coil on plug" configuration found in (almost) every >>*modern* gasoline engine design. >><http://autorepair.about.com/library/glossary/bldef-110a.htm> >>-Fred W > Well well interesting. Thanks for the links
However it could I suppose be > a faulty COP
or plug itself. Remember the first radio transmitters were > nithing more than a spark plug !!
> I agree. > Any was just a suggestion trying to be helpful. > Ditto here. I would hate for the OP to go into his mechanic and suggest > he replace the spark plug wires. He would surely appear mechanically > inept and a likely target to be ripped off. > -Fred W
Response:
[posted and mailed] > Yeah, and it could be a tumor……AM reception on BMW’s has allways been > horrible. Some are better than others, but none are great.
I have never found that to be the case, at least in the models I have been fortunate to drive. But it would hardly count as vast experience, because BMW’s are not what you might call popular around here. Nearest dealer is 260 miles away. — Panzer
Response:
> [posted and mailed]
> Yeah, and it could be a tumor……AM reception on BMW’s has allways been > horrible. Some are better than others, but none are great. > I have never found that to be the case, at least in the models I have been > fortunate to drive. But it would hardly count as vast experience, because > BMW’s are not what you might call popular around here. Nearest dealer is 260 > miles away.
I have owned numerous BMW’s and to my experience it is a fact that AM reception has been atrocious for about the last 15 years. Prior to that I don’t remember the same problems. The new cars, E60 and E65 both have superb AM reception though.
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