As posted before, my wife has a 1991 Aerostar van. We recently purchased a cheapie JVC CD HU and a set of Pioneer 4" speakers for the dash. We were also GIVEN an almost new set of Sony 6x9's (can't complain too bad when they're free). I ran all new speaker wire to all four speakers, and installed a set of 6db filtering caps on the front speaker + leads...

When installing, and testing, the system sounds perfectly fine. However, as soon as you start the van, the 4" speakers will crack and pop occasionally, and more often when it is fed some of the lower frequencies...all of which it DOESN'T do with the engine off. It will even do this from the front speakers, with the fader turned all to the way to the rear speakers.

The underside of the dash is a wiring disaster, with the blower motor, etc, all up there.

I'm planning to reroute the wires a little, trying to keep tham as far away from the other wiring and motors as possible. I'd also like to find some way to shield tham some - is this easily doable?

Also, would the system benefit much from some form of noise filter on the power lead? Only asking, as the Pioneer in my 6, as well as most other nicer HU's I've had in the past have had some form of filter in the power line.

Any suggestions greatly appreciated...
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My wifes 90 Aero also has a Pioneer HU in itand we got a lot of engine noise. My son did put a filter on the power leads from the Amps. This worked good but once in awhile we still get a POP in the speakers when the key is turned off. My son is on this sit under the name dendyr, you my try to PM him and ask questains, he dose sound system installs for a living. You my also down the site list for the sound system site here.

 

Check all of the ground straps / wires from the engine block to make sure they are in good condition. Somebody suggested on another post to add another engine ground strap just to be sure. I would think a battery cable modified to have an eye at each end would be suitable.
Only a guess, but it's cheap and easy to do and it sure wont hurt anything.

 

Make sure you are not useing the so called high performance ignition wires. THey emmit to much EM interference. Use wires equal to OEM. I also support the extra ground strap.

 

The 4L in my Aerostar with the electronic ignition produces so much interference that the radio is worthless on AM, doesn't affect FM or CD MP3 player with Ford optional rear amp and rear speakers.

 

Well, I'm going to try and reground the headunit, first...see if that makes a difference...then I'll try an extra engine grounding strap...should have a nice 4-6 gauge battery cable with two eyelets already on it, come available pretty soon.

Thanks for the info...

 

I checked mine and the filter is at the head unit pluged into the RCA plugs that go to the amps. I'm using a 300 watt amp for the 12" subs and a 550 watt amp for the mids and highs. The filter stopped about 95% of the engine noise. Still get a "pop" once in awhile when the key is shut off.