Celicasaur

Hey guys, I'm in the middle of a chop n weld on my car at home, but I've realised that I need to run a few tack welds of the pipes while bolted to the headers/car for alignment purposes....

Have any of you guys done this on yours and if so, did you disconnect the ECU connectors, or simply disconnect the main car battery?

My friend at an exhaust shop said i'll be fine to leave it as it is because I'm using a mig welder and it's only on tig welders that i would need to worry about cooking ecu's n stuff.

deadlyvt

You will be fine without disconnecting it I've never had a problem
Just keep the ground as close to the point of weld as possible with nothing within the traveling path of the current

Vladds

I would take some precautions, better to err on the safety side.

SaphGreyC63

It takes all of 2 mins to remove the ECU. I took would err on the side of caution.

Celicasaur

Thanks guys.

So the shop that did my exhaust recently totally screwed up my negative terminal and it wont come off, so i'll need to attend to that another time. What I ended up doing was removing the positive from the battery and then yes, for the sake of being on the good side of caution, i disconnected the ECU harness.

For anybody that has a W212 E63, the ECU is located inside the driver-side (RHD cars) front wheel arch.

BlakeDi

If you take into account that MIG is actually a powerful thing, then it is worth taking some precautions just in case something goes wrong. But if I were you, I would not risk it and contact prowelderguide.com to find out exactly what to do in such cases. Last year I had a job similar to yours and I first got acquainted with all the risks in this guide and even then I started to solve that problem. And it’s good that I first read the information, otherwise I could lose my hands. That is why I advise you to contact the guide

swedepat

If Tig welding, be very very carful.
HF start might kill about anything.

Tackweld with MIG, and take part away from car and finish it on the bench.

Jasonoff

Been thinking about this for 3 years. Glad it's answered now though.