[RFI] Mobile radio noise - Nissan Pathfinder

Eric Gustafson Eric Gustafson <n7cl@mmsi.com>
Tue, 6 Feb 2001 17:21:52 -0700

Hi Bill,

Sounds like you are having a classic case of fuel pump noise.
Find it and bypass it right at the pump motor with a 0.01 uF cap.
Some cases are bad enough to also require pasing a few turns of
the wires to the pump through a ferite torroid core (again right
at the pump motor).

73, Eric  N7CL

>Date: Tue, 6 Feb 2001 14:50:30 -0800 (PST)
>From: Bill Putney <billp@dune.wwpc.com>
>After many years I'm getting back into HF mobiling.
>I noticed that there is a very loud hash noise when I'm driving
>in my 1994 Nissan Pathfinder. I thought at first it was ignition
>noise and in fact I think there is some bad spark wire kind of
>noise as well. But the noise that seems to be doing most of the
>damage does not change with engine speed. Today as I was getting
>out of the car with the HF rig still on I happened to turn the
>ignition switch back on and the noise came back for a few second
>and then stopped. I opened the hood and could here something
>that sounds like a pump running for a few seconds after the
>ignition switch is thrown.
>I'm wondering if anyone has identified this problem before and
>solved it. Could it be a fuel injection pump or something that
>only runs for a few seconds if the engine isn't running but runs
>continuously when the engine is running?
>- Bill

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