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Old 06-22-2010, 10:18   #1 (permalink)
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Help Needed

Hi, I have a 2007 Ford F150. I recently put in a really nice stereo, but there is terrible engine interference. I wanted to know if the spark plugs have resistance. I didn't want to take them out as it is such a mission. Any help will be greatly appreciated.

Mike
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Old 06-22-2010, 11:50   #2 (permalink)
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Re: Help Needed

If it's a new radio, check with the radio manufacturer to see what they recommend. The original didn't do it so I wouldn't be concerned with the truck itself.
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Old 06-22-2010, 19:10   #3 (permalink)
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Re: Help Needed

Quote:
Originally Posted by Special View Post
Hi, I have a 2007 Ford F150. I recently put in a really nice stereo, but there is terrible engine interference. I wanted to know if the spark plugs have resistance. I didn't want to take them out as it is such a mission. Any help will be greatly appreciated.

Mike
Welcome to Ford Forums Special! :)

Are you referring to engine noise that comes through the speakers and changes with rpm? If so, you have a ground loop in your system somewhere. I can elaborate more on this, if this is your symptom. Spark plugs wouldn't cause this.

Can you explain to me briefly your stereo setup?
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Old 06-24-2010, 07:54   #4 (permalink)
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Re: Help Needed

Hi, thanks for your help. I have the following:

Pioneer Deck
Boston SPZ Speakers in front....regular Boston speakers in back
Two Boston Amps
1 10" Boston Subwoofer


It never did it with the normal deck but it is really annoying considering I spent a good amount on this and I hardly use it. We checked the grounds and they seem secure but I wonder if the grounds should be moved. Right now the grounds are on the metal underneath the middle arm rest in the front.
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Old 06-24-2010, 15:55   #5 (permalink)
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Re: Help Needed

Quote:
Originally Posted by Special View Post
Hi, thanks for your help. I have the following:

Pioneer Deck
Boston SPZ Speakers in front....regular Boston speakers in back
Two Boston Amps
1 10" Boston Subwoofer


It never did it with the normal deck but it is really annoying considering I spent a good amount on this and I hardly use it. We checked the grounds and they seem secure but I wonder if the grounds should be moved. Right now the grounds are on the metal underneath the middle arm rest in the front.
I would check a few things just for craps and laughs:

1) Use shielded RCA cables. Cheapies can be "noisy"
2)Make sure you haven't gone ape crap on your ground cable to the chassis. It doesn't need to be 5 feet long. In my previous setups, my ground cable was no more than 18". So your amp(s) should be 18" from where they are grounded at the most.
3)Use distribution blocks for multiple amp setups. Don't crowd all your wires in one area.
4) Adjust your levels so that the source unit is at a higher level while the gains on your amps are down.
5)Always run your power wires down the opposite side of the car as the RCAs.
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Old 06-24-2010, 19:54   #6 (permalink)
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Re: Help Needed

Glad you know about radios and stereos, KStromberg. I don't even listen to my regular radio and since you can only listen to AM radio in the morning, I'd be worried that I'd forget to shut it off in the afternoon.
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Old 06-24-2010, 20:53   #7 (permalink)
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Re: Help Needed

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Originally Posted by rtg143 View Post
Glad you know about radios and stereos, KStromberg. I don't even listen to my regular radio and since you can only listen to AM radio in the morning, I'd be worried that I'd forget to shut it off in the afternoon.
Well, I haven't been into the loop with stereos for several years now, but I did have a small setup back in the day. Between components and subs, I was running about 2400 watts. I chased down a "whine" through my speakers for almost a month and it wasn't until I "cleaned up" my setup and ran things properly that it went away. I thought I could just throw everything into the car and I would be fine. Not the case. I was running 0 gauge power and ground wires and the 3 foot-long PPI Art Series I had running the subs was drawing about 100 amps alone, so when I got this whine, it was LOUD! I had the alternator rebuilt with better internals because I fried that sucker in about a week.
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Old 06-25-2010, 09:46   #8 (permalink)
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Re: Help Needed

Thanks a lot for your help. I will have the guy who installed it go through these checks and see if he can sort it out. I will let you know if he does, and hopefully we can figure out what was causing it.
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