noise help - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Custom 68 · 08-11-2015, 04:15 PM

I have installed a new stereo and amp in my truck and have some engine whine. I have checked and seems my grounds are all good. I bought a cheap set of the inline filters between my rca jacks and the amp from amazon to try and it didn't seem to help however they were real cheap.
I know my rca cables were not the most expensive and I have them taped along the floor so maybe it is coming from there. What might be a good fix?
I might be able to pull new cables in but would rather not if I can get by with another fix.
Thanks
David

BigDan3131 · 08-12-2015, 12:09 AM

Do you have a CD ignition? If you do, that will cause the bulk of your interference.

Custom 68 · 08-12-2015, 08:51 AM

No I am running a 5.3 gen 3 motor with all the stock computer and coils. I did however change the plug wires to msd ones. I do have wires running everywhere... lol I have my computer in the back of the cab. My amp is under the seat.

Andy4639 · 08-12-2015, 12:37 PM

Is the amp grounded good. Did you twirl the RCA cables up as you ran them?
Where are you picking up the hot wire from for the radio and amp?

Un plug the amp and see if it's still there. Most times it's the radio but the amps make it worse. Unplug amp and turn radio up and see if it's there if so look for another source for the hot wire and check the radio ground wire.

Custom 68 · 08-12-2015, 12:44 PM

Quote:

Originally Posted by Andy4639

Is the amp grounded good. Did you twirl the RCA cables up as you ran them?
Where are you picking up the hot wire from for the radio and amp?

Un plug the amp and see if it's still there. Most times it's the radio but the amps make it worse. Unplug amp and turn radio up and see if it's there if so look for another source for the hot wire and check the radio ground wire.

Thanks Andy, the amp is grounded good, I didn't twirl the RCA cables. They may have had some twist to them but I know they are not expensive ones.
Hot wire coming directly from the battery for the amps but an internal source for the head unit. I will recheck the ground on the radio since it is tucked inside it may not be as good as the amp.
I had unplugged the RCA cables and didn't notice the sound but of course there is nothing going into the amp. I can unhook the amp but I think the results will be the same.

Custom 68 · 08-12-2015, 04:33 PM

I will also add the noise is the same volume regardless of how much the stereo is turned up. At low volume you can really hear it teh louder it is turned up the music will "drowned" it out.
I will check my grounds tonight.

BR3W CITY · 08-12-2015, 07:07 PM

Are you sure the noise isn't coming from your source? I'd check the deck power and ground, and I'd also check that you don't have any major changes in wire sizing in any of the runs. Going from something like a 2ga down to a 12ga on the same run can cause ground loop.

**michael bustamante** · 08-13-2015, 06:49 PM

did you use ac delco iridium spark plugs? the cheapie plugs will cause engine noise

truckin 79 · 08-14-2015, 10:17 AM

I chased something similar in my trans am. I bought new rca wires for amp,I separated speaker wires from power source wires. Finally I found a noise suppressor at the local junk yard that was attached to a old pioneer tape deck and spliced that in. That stopped the whine in my system. I know people say a noise suppressor is just a band aid for the problem but it made me happy that the whine noise was gone.

Custom 68 · 08-14-2015, 10:22 AM

Thanks guys, my last couple nights got busy so this did not get looked at. As far as plugs I don't remember what I put in there. I don't know that I bought the iridium plugs as I know they are expensive. I had changed a heat range when I was running nitrous.
I do have some cheapy noise suppressors but they didn't seem to to much. I will check my wires and maybe run another line to my head unit to make sure it is all good. My amps are wired direct and grounded good so yes I suspect it may be in the head unit.
Thanks again for the thoughts I will jump on this over the weekend.

ratedrookie · 10-02-2015, 12:11 PM

Noise can often be caused by something really simple. Since you have checked your grounds, double check the gain setting on your amps. If they are too sensitive, they will create a lot of noise. Make sure they are set properly.

Noise filters are patches and do not address the root cause.

08-11-2015, 04:15 PM	#1
Custom 68 Registered User Join Date: Nov 2001 Location: Springfield, MO Posts: 2,939	noise help I have installed a new stereo and amp in my truck and have some engine whine. I have checked and seems my grounds are all good. I bought a cheap set of the inline filters between my rca jacks and the amp from amazon to try and it didn't seem to help however they were real cheap. I know my rca cables were not the most expensive and I have them taped along the floor so maybe it is coming from there. What might be a good fix? I might be able to pull new cables in but would rather not if I can get by with another fix. Thanks David __________________ Dave 1968 Custom Chevy with turbo charged 5.3 gen III 4l80e swap 1967-71 GMC 3/4 ton long step 4x4 (not sure what year exactly?) "A good friend will bail you out of jail...but a true friend will be sitting next to you saying "that was frekin awesome". "If it doesn't fit force it...If it breaks then it needed to be replaced anyway!"

08-12-2015, 12:09 AM	#2
BigDan3131 Registered User Join Date: Jun 2006 Location: Maple Valley, WA Posts: 1,913	Re: noise help Do you have a CD ignition? If you do, that will cause the bulk of your interference. __________________ Custom Painter/Restoration Specialist 1965 GMC 3/4 Ton LB SOLD? 1964 Chevy El Camino in full restoration 1991 Chevy S10 288K+ miles 2nd Owner SOLD 2020 RAM 1500 Warlock

08-12-2015, 08:51 AM	#3
Custom 68 Registered User Join Date: Nov 2001 Location: Springfield, MO Posts: 2,939	Re: noise help No I am running a 5.3 gen 3 motor with all the stock computer and coils. I did however change the plug wires to msd ones. I do have wires running everywhere... lol I have my computer in the back of the cab. My amp is under the seat. __________________ Dave 1968 Custom Chevy with turbo charged 5.3 gen III 4l80e swap 1967-71 GMC 3/4 ton long step 4x4 (not sure what year exactly?) "A good friend will bail you out of jail...but a true friend will be sitting next to you saying "that was frekin awesome". "If it doesn't fit force it...If it breaks then it needed to be replaced anyway!"

08-12-2015, 12:37 PM	#4
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Re: noise help Is the amp grounded good. Did you twirl the RCA cables up as you ran them? Where are you picking up the hot wire from for the radio and amp? Un plug the amp and see if it's still there. Most times it's the radio but the amps make it worse. Unplug amp and turn radio up and see if it's there if so look for another source for the hot wire and check the radio ground wire. __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.

08-12-2015, 04:33 PM	#6
Custom 68 Registered User Join Date: Nov 2001 Location: Springfield, MO Posts: 2,939	Re: noise help I will also add the noise is the same volume regardless of how much the stereo is turned up. At low volume you can really hear it teh louder it is turned up the music will "drowned" it out. I will check my grounds tonight. __________________ Dave 1968 Custom Chevy with turbo charged 5.3 gen III 4l80e swap 1967-71 GMC 3/4 ton long step 4x4 (not sure what year exactly?) "A good friend will bail you out of jail...but a true friend will be sitting next to you saying "that was frekin awesome". "If it doesn't fit force it...If it breaks then it needed to be replaced anyway!"

08-12-2015, 07:07 PM	#7
BR3W CITY meowMEOWmeowMEOW Join Date: Sep 2009 Location: MKE WI Posts: 7,128	Re: noise help Are you sure the noise isn't coming from your source? I'd check the deck power and ground, and I'd also check that you don't have any major changes in wire sizing in any of the runs. Going from something like a 2ga down to a 12ga on the same run can cause ground loop. __________________ *'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING* MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD

08-13-2015, 06:49 PM	#8
michael bustamante Senior Member Join Date: Sep 2007 Location: Albuquerque NM Posts: 7,862	Re: noise help did you use ac delco iridium spark plugs? the cheapie plugs will cause engine noise __________________ 1967custom

08-14-2015, 10:17 AM	#9
truckin 79 Registered User Join Date: Jun 2014 Location: CO Posts: 749	Re: noise help I chased something similar in my trans am. I bought new rca wires for amp,I separated speaker wires from power source wires. Finally I found a noise suppressor at the local junk yard that was attached to a old pioneer tape deck and spliced that in. That stopped the whine in my system. I know people say a noise suppressor is just a band aid for the problem but it made me happy that the whine noise was gone. __________________ 79 Chevy 2wd BIG10 350 TH400

08-14-2015, 10:22 AM	#10
Custom 68 Registered User Join Date: Nov 2001 Location: Springfield, MO Posts: 2,939	Re: noise help Thanks guys, my last couple nights got busy so this did not get looked at. As far as plugs I don't remember what I put in there. I don't know that I bought the iridium plugs as I know they are expensive. I had changed a heat range when I was running nitrous. I do have some cheapy noise suppressors but they didn't seem to to much. I will check my wires and maybe run another line to my head unit to make sure it is all good. My amps are wired direct and grounded good so yes I suspect it may be in the head unit. Thanks again for the thoughts I will jump on this over the weekend. __________________ Dave 1968 Custom Chevy with turbo charged 5.3 gen III 4l80e swap 1967-71 GMC 3/4 ton long step 4x4 (not sure what year exactly?) "A good friend will bail you out of jail...but a true friend will be sitting next to you saying "that was frekin awesome". "If it doesn't fit force it...If it breaks then it needed to be replaced anyway!"

10-02-2015, 12:11 PM	#11
ratedrookie Registered User Join Date: Aug 2015 Location: Southern California Posts: 11	Re: noise help Noise can often be caused by something really simple. Since you have checked your grounds, double check the gain setting on your amps. If they are too sensitive, they will create a lot of noise. Make sure they are set properly. Noise filters are patches and do not address the root cause.



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