Fresh build issues
Logistics Pro
Joined: Aug 2014
Posts: 3,558
Likes: 852
Unless the shift points are drastically different between a 302 and 351
What was the code on your original computer, and what is the code on the new computer?
What rear end gear and what size tires you have?
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Cross-Country
Joined: Mar 2020
Posts: 51
Likes: 6
From: SJ TX
3.55 or 3.73 open. 31x10.50r15. Cant get the computer information at the current moment
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Cross-Country
Joined: Mar 2020
Posts: 51
Likes: 6
From: SJ TX
Little update, truck has been running good. I replaced MLPS and the pigtail, every single one of the wires was worn through, and the body of the sensor broken in 3 places. Drove the truck and it shifted significantly better, still a shudder but not as noticeable, and I had to look for / simulate the conditions it happens under. Truck has stalled on me once or twice, always restarting after putting it in neutral and hitting the key. Went for a drive today and it died right out the parking spot, cranks and cranks.. put a spark tester on it and no spark. Tested for voltage at the back of the coil and its bouncing 0-6.5v 0-7.8v repeatedly, wait a few and it restarts, runs 10 seconds then I can see the voltage drop from 12.5 to 11 to 7 before it dies, I can visably see the spark get weaker and more inconsistent (all in the span of a few seconds.) now it just cranks, no voltage to coil. Wiggled all my wires, I have replaced all the pigtails on this harness with new connectors and every single connection is soldered and heatshrinked, so I dont think it is the harness. What else could be causing this? I checked all fuses and they are fine, fuel pump cycles with key still. TIA!!
Fleet Owner
Joined: Oct 2005
Posts: 20,786
Likes: 1,751
From: Kentucky
Coil power comes from fuse U in the power distribution box. That fuse gets power via the ignition switch when the key is in the Run and Start position. I have seen a few cases where the radio capacitor is pulling down the supply voltage but not enough to blow the fuse. Easy to disconnect it to see if your issue goes away.
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