Why is there engine noise in my back speaker only?
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More Turbo
Joined: Aug 2006
Posts: 683
Likes: 6
From: North Georgia
Why is there engine noise in my back speaker only?
I got his 98 Ranger with a later premium cd, cassette, radio that worked good for awhile. It still works good but I hear engine noise in the speaker right behind the seat. It's a regular cab with 4 speakers. I replaced the speaker behind me with a brand new Ford one thinking it maybe the speaker but it didn't go away. If you change to any of the other 3 speakers it doesn't come through them, just normal sound. Even if I try to turn the sound just to the front, you can still hear engine noise coming from that one speaker. I thought it maybe the radio noise capacitor bolted to the coil pack so I replaced that with a new Ford piece. Nothing changed. Is there something I'm missing? Is the radio bad? I have 2 80-Watt Premium am/fm/cd/cassette rds radios that work but the screens are dead so I haven't tried installing them. I was going to send one off and get it refurbished. I had an aftermarket cd player in the truck for years but I like that factory radios.
5th Wheeling
Joined: Oct 2024
Posts: 35
Likes: 9
From: Topsail Beach
Just for S&G, the first thing that came to mind was the ground to the speaker. Could you attach a jumper from the ground tab on the speaker to a metal body part on your truck just to see if it goes away? Might be a waste of time but it might not too.
Logistics Pro
Joined: Jan 2002
Posts: 4,907
Likes: 39
From: suburban atlanta
You could have a damaged wire between the radio head and the noisy speaker. The ground/return might have to take a roundabout way back to the audio source, such as underhood and across the engine somewhere. It could then pick up RF from underhood contributors... and leak that noise into the radio/audio.
To eliminate that possibility, I would check the resistance of the return wire end-to-end, and to ground at the speaker end. If there is a break, ohms would be whacko, if it routes through underhood areas, the ohms would not make sense. If it ohms out correctly, never mind.
tom
To eliminate that possibility, I would check the resistance of the return wire end-to-end, and to ground at the speaker end. If there is a break, ohms would be whacko, if it routes through underhood areas, the ohms would not make sense. If it ohms out correctly, never mind.
tom
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More Turbo
Joined: Aug 2006
Posts: 683
Likes: 6
From: North Georgia
The noise doesn't change with increase in RPM. It dissipates sometimes and sometimes you can't hear it. If you ever watched the Jetsons cartoon it actually sounds like a Jetsons car. Sometimes it's more prevalent than others. I actually haven't tried unplugging that speaker and running 3 speakers. That's what I was thinking of trying to test it out. I can inspect the wires while I'm there too.
Logistics Pro
Joined: Jan 2002
Posts: 4,907
Likes: 39
From: suburban atlanta
If the noise is constant frequency, then it likely does NOT come from an engine component. It is more likely a failing component that is directly in the LR autio output circuit. A failing/failed capacitor could allow buzzes into the audio output. To fix that requires instruments and a workstation that is unavailable to most. You could take it to a radio repair shop.... If you can find one.
More likely, if it is OEM, finding a used unit from a boneyard is more likely to result in a normally operating audio system. Unless it is one of the 'up market' audios, such as B&O, Bose, Altec, etc, the cost
from a boneyard is generally less than having a shop attempt a repair. I cannot quote prices, but car dash part dot com .. likely has whatever you need, and can locate by geograpic area.
tom
More likely, if it is OEM, finding a used unit from a boneyard is more likely to result in a normally operating audio system. Unless it is one of the 'up market' audios, such as B&O, Bose, Altec, etc, the cost
from a boneyard is generally less than having a shop attempt a repair. I cannot quote prices, but car dash part dot com .. likely has whatever you need, and can locate by geograpic area.
tom
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