Radio reception crap/ worse when motor is cold

Did you do an earth connection with new head unit? I remember mine was real crap until I added one....


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Just wondering if you have a link to this whip antenna?

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Originally Posted by Bacho86

Did you do an earth connection with new head unit? I remember mine was real crap until I added one....


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I thought the same thing.
The original factory cassette thing used the aerial as the ground.
These new units need a separate ground .

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Originally Posted by mudski

I did notice it changed with the revs. Yeah i remember those suppressors too. But they were fitted to the ignition coil from memory...

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Used to fit them to both. Especially on old minis. They never worried about suppression because they never came out with radios.

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Originally Posted by Hodge

Believe it or not Mark. Mine is identical! Exact same symptoms.
It done it with factory aerial .
Then i completely cut it out and disconnected it and installed a Gme whip antenna like yours and issue is still present.

However mine only does it when motor is running. Motor off brings perfect radio reception.

But i never listen to radio anyway so i just ignored it.

Edit: mine is a pioneer head unit.

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That clearly indicates noise interference from the ignition system.

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Originally Posted by threedogs

Just because the batteries arent old doesnt mean they are not the problem.
Id be fitting an inline noise suppressor.
OOI I still use the OE antenna and have a "chit" eonon head unit and have no problems
whats so ever

Had a think I reckon you may have a "burnt" wire somewhere

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So whats a "burnt" wire? I know my batteries arent causing this. This issue has been about since Ivé had the car. With different batteries...

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Originally Posted by Mike02Ti

It does sound like you have a ground loop of some sort. Have you added or changed the routing of any wiring ?

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No routing for the stereo has been changed.

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Originally Posted by Bacho86

Did you do an earth connection with new head unit? I remember mine was real crap until I added one....
The body of the unit earths itself( well I assume it does) when I screw in the metal mounting brackets....

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Originally Posted by Throbbinhood

Just wondering if you have a link to this whip antenna?

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https://www.gme.net.au/catalogue/ant...one/aem2w.aspx

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Originally Posted by dom14

That clearly indicates noise interference from the ignition system.

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It does seem so...

I drove it today, for the first half hour the radio was crap, by the time I was heading home the reception was near perfect.

Routing for the radio doesnt need to change to introduce a ground loop. Any change in any wiring can potentially introduce it.
Another thing you could check alternator wiring. Have also heard of ignition coils and leads causing issues (from memory you have a diesel though so scratch that), fuel pumps etc.

Is there any power wiring in contact or running close to either the speaker wires/ amplifiers if you have them fitted or the head unit power source

Chasing ground loops suck. I chased mine for about 4 days before i found a cable running to the rear of the car in close proximity to the amp causing it. Didnt know it was there as it was like that when i got it.

Oh one more thing could be the preouts on the rear of the unit have a small amount of voltage in. If they are touching metal beind the dash that could also possibly cause it

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Originally Posted by Mike02Ti

Routing for the radio doesnt need to change to introduce a ground loop. Any change in any wiring can potentially introduce it.
Another thing you could check alternator wiring. Have also heard of ignition coils and leads causing issues (from memory you have a diesel though so scratch that), fuel pumps etc.

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My bad...of course no point talking about interference from ignition on diesel engines. :)

Try a small portable radio. Tune it off station and turn volume up. Wave it over the vehicle and engine to locate the source.

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Originally Posted by Turtle_au

Try a small portable radio. Tune it off station and turn volume up. Wave it over the vehicle and engine to locate the source.

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does that work sorta like a tracking collar??? @mudski maybe run another earth and see if that
improves it or not, even run it to one of your batteries