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Old 10-28-2013, 12:05 PM   #26
shearjs
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Join Date: Mar 2011
Location: Thompsons Station, TN
Posts: 700
Re: LS Swap Troubleshooting..no pedal response

We had a guy come by this past weekend to go through things and do some troubleshooting. He works for the local dealership, and knows a little more about troubleshooting than we do. Overall, we ended up leaving all the new parts on, throttle body, pedal sensor, wiring from pedal to TAC. The pedal was working OK, but still a little sporadic at times, but the engine was running terrible. The fans weren't kicking on like they should, and it turns out the coolant temp in the ECM wasn't matching the coolant temp on the dash gauges. After several hours of tracing wires and clearing codes, he determined that there was a ground wire that we had grounded to the firewall, that wasn't getting a good ground, and should have been grounded to the engine. The other suggestion was a faulty engine coolant temp sender in the driver side head. I had an old 5.3 on the engine stand, so we swapped the coolant temp sender to the 6.0 in the truck. Seems to have done the trick. Truck is running smooth, electric fans are kicking on when they should, and we now have the accelerator back. Time for some more shakedown miles! Thanks for all the suggestions and ideas. It's been much appreciated.
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