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

[Jon Prevost]

The best explination I ever got was ground location. Just like how your
engine is your spark plugs ground (high voltage) it's about where it's
grounded. Obviously you wouldn't ground your engine to your computer ecm for
current issues, same with welding. If you place the ground on the exhaust
tubes it's far enough away from the computer to not have much current. The
body is one BIG wire mess. If you're ground is on the exhaust pipes that
you're welding then the current will take the path of least resistance. This
is the best explination and I believe it to be true, just call up someplace
like Mufflex. Those guys rock!
, Jon Prevost
p.s.~turn off html when posting to the list, some guys don't like it!
----- Original Message -----
From: Chris Spies, ATI ProCharger
To: diy_efi at diy-efi.org
Sent: Friday, January 31, 2003 3:26 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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