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What precautions do you take when welding on a Fuel Injected vehicle?

B

boss351

Member
Since I have installed the EFI system on my mustang, I am curious as to what is considered good enough when welding on this vehicle. I don't want to short out the computer or burn up any circuits. Is disconnecting the battery enough, or should I go as far as unplugging the computer? I have never messed anything up on any other vehicle, but I don't want to risk anything with the EFI system as my budget is pretty well spent, and I don't have the cash to replace the high dollar componets at this time.
 
That's a good question! Certainly, I would disconnect the battery, and probably remove the actual EFI computer.

Unrelated to electronics, but remove all glass or cover it well with thick leather blanket-material, as welding splatter wrecks all car glass.
 
Actually this is a good subject for almost any Mustang. Even if you have muffler work done on your Mustang where there is welding involved.....be careful especially if you have a msd box, disconnect it otherwise it might fry.
 
Just disconnect the battery and you will be fine. I have welded about 12 times on my car since the EFI conversion and have not caused any problems. I even forgot to disconnect the battery one time and it was still fine. Freaked me out for a second but everything was good.
 
I have welded on quite a few cars and trucks myself with no problems. I think unhooking the battery is a good idea, but I have never seen any of the muffler shops do it, and they weld all the time. Probably more important is hooking up your ground right where you are going to weld. You don't want current arcing through bearings or electronics searching for a ground, that where you are likely to get some damage. I have one of the magnetic grounds that you attatch your ground cable to. They don't cost much, and you can stick it on any flat surface where you are working then just clamp your ground to the stud on it.
 
I welded on my Foxbody without disconnecting anything. No problems.

I think the point about the ground being close to the work zone is a good one.
 
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