need help!
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Elder User
Joined: Jan 2006
Posts: 861
Likes: 1
need help!
Have a 1990 aerostar with a 4.0l engine and when you turn the key on the stereo pops and the inside lights flicker with the pop. The stereo is off and the face plate is out and it still pops through the speakers. When you start it you hear the engine through the speakers. The check engine light comes on and off from time to time. When plugged into the computer to get a code the light goes out and the motor revs up for a minute then goes back to normal until you unplug it. Went through and replaced the coil pack this weekend. Did not help.
Posting Guru
Joined: Aug 2007
Posts: 1,036
Likes: 2
From: Portland, Oregon
How did you hook up the stereo? if you chopped up the factory harness that could make the weird noises. sounds like something is shorting out. I know i had issues when i first hooked up a cdplayer in my dad's aero, and i cut up the factory harness's, i had issues with the speakers sounding bad and not working right.
Post Fiend
Joined: Apr 2005
Posts: 5,720
Likes: 5
From: Washington state
best to add a stereo with a 12v relay powered directly from the battery and switched with ignition or added switch.
12v wiring on Aero will not handle most add on stereos
also solves most of the alternator ignition engine computer noise problems.
always ground stereo on chassis metal as close to stereo as possible. never back to battery.
12v wiring on Aero will not handle most add on stereos
also solves most of the alternator ignition engine computer noise problems.
always ground stereo on chassis metal as close to stereo as possible. never back to battery.
Posting Guru
Joined: Aug 2007
Posts: 1,036
Likes: 2
From: Portland, Oregon
Originally Posted by 96_4wdr
best to add a stereo with a 12v relay powered directly from the battery and switched with ignition or added switch.
12v wiring on Aero will not handle most add on stereos
also solves most of the alternator ignition engine computer noise problems.
always ground stereo on chassis metal as close to stereo as possible. never back to battery.
12v wiring on Aero will not handle most add on stereos
also solves most of the alternator ignition engine computer noise problems.
always ground stereo on chassis metal as close to stereo as possible. never back to battery.
Lead Driver
Joined: Oct 2004
Posts: 8,062
Likes: 35
From: Central Oregon
The Areo that Allen Jr is talking about is my wifes, the stereo has been the van for years without any noise. The problems with it started with a random CEL with NO codes, it has been check by 5 differant shops and differant computers. The popping and it had a buze, that he is talking about started when the van died while it was running down the road at 60mph and started up again on it's own. This past weekend we changed the coil pac, battery and the spark plugs. I still have the popping in the stereo that makes the lights blink, and as of yesterday, still getting a random CEL.
Former ******
Joined: Nov 2004
Posts: 4,901
Likes: 2
From: Salt Lake City, Utah
Question, what kind of plugs and wires do you have. The reason I ask is that non-OEM wires may not have the proper noise suppression. If the wires are emitting too much electromagnetic noise, it may be audible on the stereo, and it can also feedback into the computer causing erratic behavior. If you are not using Motorcraft wires, or the wires are really old, I would suspect they may be involved.
Lead Driver
Joined: Oct 2004
Posts: 8,062
Likes: 35
From: Central Oregon
They are aftermarket wires and about one year old, and the noise just started. My son fond a loose plug on the alt. and it seems to be ok as of last night, will see today, my wife took it to work today.
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Postmaster
Joined: Apr 2001
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Originally Posted by customcab66
Went through and replaced the coil pack this weekend. Did not help.
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Lead Driver
Joined: Oct 2004
Posts: 8,062
Likes: 35
From: Central Oregon
Originally Posted by aerocolorado
Just a thought. Did you note and re-install (ground) the static suppressor that mounts on the coil pack frame?
Postmaster
Joined: Apr 2001
Posts: 3,818
Likes: 3
bertha,
The static suppressor is mounted to the coil pack frame but the lead wire is grounded by one of the coil pack hold down bolts - if memory serves. In those tight confines, its easy to overlook a small, dark, wire lead like that. There is only a single lead, so you can reach back with one hand and finger trace the lead to its mounting point.
The static suppressor is mounted to the coil pack frame but the lead wire is grounded by one of the coil pack hold down bolts - if memory serves. In those tight confines, its easy to overlook a small, dark, wire lead like that. There is only a single lead, so you can reach back with one hand and finger trace the lead to its mounting point.
Elder User
Joined: Dec 2006
Posts: 830
Likes: 0
From: Kitchener,Ontario,Canada
Originally Posted by customcab66
Have a 1990 aerostar with a 4.0l engine and when you turn the key on the stereo pops and the inside lights flicker with the pop. The stereo is off and the face plate is out and it still pops through the speakers. When you start it you hear the engine through the speakers. The check engine light comes on and off from time to time. When plugged into the computer to get a code the light goes out and the motor revs up for a minute then goes back to normal until you unplug it. Went through and replaced the coil pack this weekend. Did not help.
Sounds like you could have a bad ground connection somewhere.
Do all of your electricals work correctly ?
Last edited by Aeroman59; Jan 22, 2008 at 04:34 PM.
Postmaster
Joined: Apr 2001
Posts: 3,818
Likes: 3
Originally Posted by aerocolorado
bertha,
The static suppressor is mounted to the coil pack frame but the lead wire is grounded by one of the coil pack hold down bolts - if memory serves. In those tight confines, its easy to overlook a small, dark, wire lead like that. There is only a single lead, so you can reach back with one hand and finger trace the lead to its mounting point.
The static suppressor is mounted to the coil pack frame but the lead wire is grounded by one of the coil pack hold down bolts - if memory serves. In those tight confines, its easy to overlook a small, dark, wire lead like that. There is only a single lead, so you can reach back with one hand and finger trace the lead to its mounting point.