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Damage to ECM while welding.

Steve Jordan

New member
Joined
Mar 1, 2020
Messages
4
Location
Canada
Corvette
84 c4 grey
Have a 84 C4 with rust on rt side frame rail. Extensive welding was done and frame was repaired.
i went to start and And the engine seemed to be at wide open.
During the welding repair I did not take out the computer.
Fearing I need to replace ECM.
Is there something I am overlooking?
 

compyelc4

Well-known member
Joined
May 1, 2002
Messages
605
Location
Dayton, Ohio
Corvette
'95 LT1 Coupe, Comp Yell; C6 Roadster, Vel Yell
Have a 84 C4 with rust on rt side frame rail. Extensive welding was done and frame was repaired.
i went to start and And the engine seemed to be at wide open.
During the welding repair I did not take out the computer.
Fearing I need to replace ECM.
Is there something I am overlooking?

What type of welding? Did you disconnect the battery?
 

compyelc4

Well-known member
Joined
May 1, 2002
Messages
605
Location
Dayton, Ohio
Corvette
'95 LT1 Coupe, Comp Yell; C6 Roadster, Vel Yell
Battery was disconnected, mig welding
Steve, I sent a copy of your question to a good friend of mine who is a professional welder. Here is his reply:

Unfortunately when welding on vehicles (frames etc.) it is critical where you set up your ground back to weld machine. As you know computers are very sensitive to arc. I have welded on many vehicle frames and ALWAYS unplug computer and put ground clamp as close to work as possible. I have never fried one. Excited electrons ALWAYS find the shortest path to ground, even if that is directly through computer.
 

Steve Jordan

New member
Joined
Mar 1, 2020
Messages
4
Location
Canada
Corvette
84 c4 grey
Ted thank you for asking your friend about my issue.
My ground was right near or on the piece I was welding.
Hindsight wish I did unplug it. I know better.
 

compyelc4

Well-known member
Joined
May 1, 2002
Messages
605
Location
Dayton, Ohio
Corvette
'95 LT1 Coupe, Comp Yell; C6 Roadster, Vel Yell
Well good luck Steve. I suppose your getting codes all over the place?
 

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