2004 Jeep TJ Welding precautions

Tiny
DENNIS JACKSON
  • MEMBER
  • 2004 JEEP WRANGLER TJ
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 40,000 MILES
Problem- I have a large nut-cert in a frame rail that has a bolt stuck in it. The nut-cert is turning in its hole. I would like to tack weld the edge of the nut -cert to the frame with 3-4 tack welds. The threads are recessed 1/4" into the nut-cert so I think I can tack it without disturbing the threads. I will disconnect the battery. Do I need to also disconnect the ecu. Does the ecu need power to it to keep its memory? The location of the nut-cert is midway between front and rear axels on bottom side of right frame rail.
Thursday, September 3rd, 2009 AT 1:07 PM

1 Reply

Tiny
MMPRINCE4000
  • MECHANIC
  • 8,548 POSTS
There is a device called "AntiZap" made by SPX-OTC that connects to battery on newer cars that protects the PCM and electronic components when welding.

You can also disconnect battery, PCM and Alternator.

Place MIG/TIG welding ground as close to weld target as possible.

The PCM will re-learn mormal operating parameters within a few hundred miles of normal driving.
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Friday, September 4th, 2009 AT 7:13 AM

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