[Diy_efi] Jetronic - RFI

Don Sauman donsauman
Thu Mar 2 08:59:55 UTC 2006

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.
>> 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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