E4OD/Tach Problems
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Logistics Pro
Joined: Feb 2011
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From: Townsend, MT
It's not the wires between the tach and TCM, you can short out those wires all day long and the tcm will just go into tach less mode and shift late. Your problem sounds exactly like the tcm is loosing ground and reseting, the tcm controls the ground side of the shift solenoids and the eec relay supplies the power side, the ground is on the rad support but you can also run a wire from battery negative to I believe pin 60 or 59 which should be a thicker black wire with a white stripe or just black, check/try that and let us know what comes of it.
Oh, and how are the pins numbered?
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Logistics Pro
Joined: Feb 2011
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From: Townsend, MT
So are you saying that a tach wire could be shorting to another wire? If yes, I understand now. I am a *little* thick headed at times.
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Logistics Pro
Joined: Feb 2011
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From: Townsend, MT
In the past two hours, I have done the following:
Ran a new ground wire to the TCM = still hunts
Tried to find something wrong with the tach wires. I couldn't find anything wrong and I was getting a little irritated so I took a pair of dykes to the tach wires at the TCM = still hunts
Pulled the EEC relay and powered the TCM with a wire directly to the battery = still hunts
The thing that confuses me is that everything works great (even the tach before I nipped the wires) when at WOT or almost WOT.
Ideas?
Ran a new ground wire to the TCM = still hunts
Tried to find something wrong with the tach wires. I couldn't find anything wrong and I was getting a little irritated so I took a pair of dykes to the tach wires at the TCM = still hunts
Pulled the EEC relay and powered the TCM with a wire directly to the battery = still hunts
The thing that confuses me is that everything works great (even the tach before I nipped the wires) when at WOT or almost WOT.
Ideas?
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Logistics Pro
Joined: Feb 2011
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From: Townsend, MT
Thanks, I'll give it a shot.
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Logistics Pro
Joined: Feb 2011
Posts: 3,522
Likes: 11
From: Townsend, MT
IT WORKS LIKE A NEW MACHINE!!!!!!
You have no idea how happy I am right now. I soldered my tach wires back together so my lockup works and the tach never jumps.
I owe speedwrench big time.
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