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80 messages,  Last post on Nov 25, 2009 at 1:46 PM

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#2 of 80 Radio plays spark plug firing by ncgeorge Mar 17, 2004 (5:12 pm)
My 2000 LS V8 with approximately 42000 mi has a radio noise problem. In addition to the station I've tuned in or CD I'm playing the speakers are transmitting the sound of the spark plugs firing. When you rev up the engine you can actually hear it through the speaker system. (When the engine is off radio plays beautifully.) I evidently have a radio frequency (RF) shielding problem. Has anyone else experienced this and do you know what was repaired/replaced to cure the problem? Was it near the antenna or near the radio? Replies to this message: gwg1 (Dec 22, 2005 9:58 am) akirby (Dec 22, 2005 10:05 am) cdnpinhead (Dec 22, 2005 12:22 pm)
#3 of 80 Re: Radio plays spark plug firing [ncgeorge] by gwg1 Dec 22, 2005 (9:58 am)
Replying to: ncgeorge (Mar 17, 2004 5:12 pm) I have the same problem. Not only is it intermittent but it comes and goes when I hit bumps! I've had it in to the dealer 4 or 5 times. The first problem was getting it to occur when the dealer had the car. Then they replaced the amp twice. It's still there and they can't fix it. I also have a new problem. I get static on the radio at the high and low end of the FM band when I turn the rear window defroster on. Replies to this message: akirby (Dec 22, 2005 10:05 am) cdnpinhead (Dec 22, 2005 12:22 pm)
#4 of 80 Re: Radio plays spark plug firing [gwg1] by akirby Dec 22, 2005 (10:05 am)
Replying to: gwg1 (Dec 22, 2005 9:58 am) Have the dealer check for TSBs on faulty ground connections.
#5 of 80 Re: Radio plays spark plug firing [gwg1] by cdnpinhead Dec 22, 2005 (12:22 pm)
Replying to: gwg1 (Dec 22, 2005 9:58 am) You don't say, but I'm guessing you've got the Alpine upgrade (with the subwoofers). I've had the same problem, once under warranty and once right now.   It certainly has all the earmarks of a bad ground and/or internal connection, given the way it comes & goes when hitting bumps. The wizard who "repaired" it under warranty replaced the subwoofer amp, and it did go away. . .for awhile.   Last summer, as I was rolling south through Nevada listening to a book on tape, it reappeared. In the ensuing months, I've learned that the single best way to make it go away (for up to a week) is to open the trunk & give the subwoofer amplifier a sharp rap with my hand. So far, it's worked every time. . .for awhile.   I'm not sure what's in the Service Bulletin, but over the break next week I intend to have a careful look at how the amp is mounted & whether star washers and/or a grounding strap might be in order.   After all, I don't want this "issue" to appear while I'm trying to sell my poor orphaned LS, which I'm hoping to do in the next ~year. It may only be worth $1.87, but if the audio system goes South during the test drive. . .
#6 of 80 Weird Feedback out of rear radio speakers by zlieven Jan 04, 2006 (6:01 pm)
I have a 00 LS V8 with 80K. This problem sounds similar to one recently posted by someone saying their radio was playing the spark plug firing. I just had my car in to replace the sway bar and bushings. In the process, I had them replace the battery. Ever since then, I have gotten the weird feedback from the radio. I took it back in and they couldn't find anything, in fact in the process of their inquiry, the sound went away. Since then, a week has passed and it has come and gone. If I disconnect the amp for the subwoofers, the sound is gone, but then no bass. Otherwise the radio works fine. Could this be something with the battery, or the way its hooked up? Any suggestions would be appreciated!! Replies to this message: akirby (Jan 04, 2006 9:39 pm) 2000mtx (Mar 02, 2006 6:12 am) tagler (Mar 07, 2006 7:25 am) tagler (Mar 07, 2006 7:19 am)
#7 of 80 Re: Weird Feedback out of rear radio speakers [zlieven] by akirby Jan 04, 2006 (9:39 pm)
Replying to: zlieven (Jan 04, 2006 6:01 pm) Recheck the battery cables and all connections in the trunk area. Sounds like a loose ground.
#8 of 80 Re: Weird Feedback out of rear radio speakers [zlieven] by 2000mtx Mar 02, 2006 (6:12 am)
Replying to: zlieven (Jan 04, 2006 6:01 pm) You mean the rapid "Tick, Tick, Tick...." noises?   My dealer replaced my radio (under warranty)quoting "electrical problems".   Funny thing? Some times my stereo lights stop working on the new stereo. Replies to this message: tagler (Mar 07, 2006 7:25 am)
#9 of 80 Re: Weird Feedback out of rear radio speakers [zlieven] by tagler Mar 07, 2006 (7:19 am)
Replying to: zlieven (Jan 04, 2006 6:01 pm) I had the same problem on my 00 LS. The problem is ignition noise being induced on the 12VDC supply to the speaker power amp mounted under the rear deck. I placed a 200 picofarad capacitor accross the supply at the connect to this amp this and it fixed it. Tim Agler
#10 of 80 Re: Weird Feedback out of rear radio speakers [2000mtx] by tagler Mar 07, 2006 (7:25 am)
Replying to: 2000mtx (Mar 02, 2006 6:12 am) Correction - the capacitor I used accross the supply was a 200 micofarad capacitor Tim Agler

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