[Diy_efi] Welding on cars w/ ECU's??

[Chris McKinnon]

Wouldn't you want a smaller, faster cap like a metalized poly EMI supression
cap across the battery? The battery is already a cap with it's parallel
plates and electrolite  but it's more like an electrolytic cap which has
poor transient response... Right?

Chris

>Easiest answer is that it probably started from the autobody industry. Hi
>frequency machines "theoretically" could induce voltages into the PCM (some
>are mounted lower left/right fender, others at the frame horn, etc...) and
>fry the chips--I've never had or have seen this problem,  but you never know
>when some "welder" is going to put the ground clamp onto a PCM / ECM case,
>"someday". We do have a giant capacitor that we install across the battery
>terminals when doing any weld repairs--just in case.
>
>Lyndon ; )
>
>----- Original Message -----
From: "Chris Spies, ATI ProCharger" <proddev at procharger.com>
>To: <diy_efi at diy-efi.org>
>Sent: Friday, January 31, 2003 1:26 PM
>Subject: [Diy_efi] Welding on cars w/ ECU's??
>
>
>Can anybody explain to me why it is you can not (at least the aftermarket
>manufacturers prefer that you not) weld on a vehicle while the ECU is
>connected (electrically) to the vehicle?  It seems that muffler shops weld
>on vehicles with factory ecu's all day long without trouble, however I have
>heard many horror stories of damaged aftermarket ECU's and ignition boxes
>when somebody neglected to disconnect the harnesses?  I have never really
>been given a good answer, I just follow the rules and hope to avoid
>disaster...
>
>-thanks
>-Chris
>
>
>
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