[Diy_efi] Jetronic - RFI
Thu Mar 2 09:14:47 UTC 2006
Its a thought.
mark krawczuk wrote:
> hi, would a greencap or ceramic help in filtering? i know it did help
> in my brothers crank trigger that was picking ip alot of noise ?
> mark k
> ----- Original Message ----- From: "Don Sauman" <donsauman at cythera.net>
> To: <diy_efi at diy-efi.org>
> Sent: Thursday, 2 March 2006 7:29 PM
> Subject: Re: [Diy_efi] Jetronic - RFI
>> To be honest I am not sure where it is located, but I will find it.
>> You could be right about the fields although these are trains are low
>> speed domestic. Mu metal will work but so will soft iron e.g. soft
>> iron film cans so mag stripe is not degraded and vid tapes.
>> I will try the rfi shielding first and see how that goes. As for the
>> dealers here, I suspect almost all of you guys knows more about this
>> than any of them. Apart from that, they really don't want to know
>> about an '87 model Volvo, but they are lovely cars. Could use a heart
>> transplant though. Let's see a Chev 350 bored and stroked to 400ci :-)
>> urq wrote:
>>>> On this same topic, I have 1987 Volvo 760 GLE that has a related
>>>> problem. While waiting at a railway crossing, an electric train
>>>> passes, and the brake pedal will vibrate and then relax with ABS
>>>> warning light coming on. The immediate fix is to, at an appropriate
>>>> place, switch off the ignition and restart.
>>>> I think you have given me a clue as to a solution. Put the ABS
>>>> controller in a grounded box, and use some ferrite beads on the leads.
>>> ... it is difficult to tell for sure, but since the ABS system is so
>>> prone to electrical noise from the other systems in the car
>>> (primarily ignition & charging), the manufacturers usually do a
>>> passable job of basic shielding from electrical interference... in
>>> my ABS-equipped Audis the ABS brain is under the back seat. What
>>> may in fact be happening in your case is the noise is magnetically
>>> coupled ... I'd expect you'd get some pretty big and fast moving H
>>> fields in a high speed electric train. If that's the case you may
>>> have a difficult time creating an effective shield. The systems my
>>> company builds use strong electromagnets to move stages around, and
>>> they can cause the display on a standard CRT to get distorted. We
>>> had to use something called a mu-metal shield around the CRT to
>>> minimize the effect.
>>> I suspect you aren't the only one in your area to have experienced
>>> this ... perhaps you can pose your experience to a local Volvo
>>> dealer to see if it is something they've heard reported before ...
>>> Steve B
>>> San Jose, CA (USA)
>>> Diy_efi mailing list
>>> Diy_efi at diy-efi.org
>> Don Sauman
>> 35 Asteroid Way
>> Carlisle 6101
>> Western Australia
>> P: 08 9361 0337
>> F: 08 9361 0581
>> M: 0427 389 547 CDMA
>> M: 0413 746 695 GSM
>> Diy_efi mailing list
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35 Asteroid Way
P: 08 9361 0337
F: 08 9361 0581
M: 0427 389 547 CDMA
M: 0413 746 695 GSM
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