[Diy_efi] Jetronic - RFI

mark krawczuk krawczuk
Thu Mar 2 09:11:15 UTC 2006

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  :-)
> Cheers
> Don
> 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.
>>> Comment?
>> ... 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)
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> -- 
> Don Sauman
> 35 Asteroid Way
> Carlisle 6101
> Western Australia
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