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7.3L IDI Diesels FAQ Frequently asked questions in the Powerstrokes 7.3L IDI Diesels forum.

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post #61 of 81 (permalink) Old 05-10-2016, 01:53 AM
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Well i wired the rpm sensor and tps sensor and i have a strong reverse, Thanks a lot. It will not shift 1-2-3 on its own with the 94 controller, so I'm guessing I need a VSS instead of OSS like I have now. Can I use the vss signal from the rear end of the 01 truck for a vss?
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post #62 of 81 (permalink) Old 05-10-2016, 07:02 AM
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Can I use the vss signal from the rear end of the 01 truck for a vss?
That should work.
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post #63 of 81 (permalink) Old 05-10-2016, 06:33 PM
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That should work.
It worked Mark. Thanks for all the help. I have 3 gears so far and a strong reverse. I will fabricate an overdrive switch now.
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Will this 94 TECA controller bypass the coast clutch correctly when the OD is enabled?

Also, it has a very firm engagement in all the gears. Is that normal for a new transmission? I have all the sensors plugged in now. The TPS, RPM, VSS and barometric sensors

Maybe because of the clutches used? I installed max clutch discs in all with HD drums and 3 OD discs.

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post #64 of 81 (permalink) Old 05-10-2016, 09:56 PM
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Without an overdrive switch installed the software will default to overdrive enabled. I don't know why you are not getting overdrive.
The 94 TECA knows to not turn on the coast clutch solenoid when in fourth gear.

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post #65 of 81 (permalink) Old 05-10-2016, 10:09 PM
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Oh maybe od works, I wasn't going very fast
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post #66 of 81 (permalink) Old 05-11-2016, 10:03 AM
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Ok Mark, this is weird. It did not shift before I tapped the vss wire . After connecting the wire, it started shifting 3 gears. Now I just remembered I forgot to plug the VSS sensor back in when i was testing it at the rear end.

I don't understand how it shifts with just the wire tapped and the sensor not plugged in. Maybe just using RPM of engine ?
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post #67 of 81 (permalink) Old 05-11-2016, 11:46 AM
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If the VSS signal is missing it will shift by RPM.

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post #68 of 81 (permalink) Old 05-11-2016, 12:32 PM
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Oh ok . It's odd it didn't shift before the vss . Thanks again
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post #69 of 81 (permalink) Old 05-12-2016, 07:30 AM
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What causes the weak reverse? Is it going into limp mode?
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post #70 of 81 (permalink) Old 05-12-2016, 09:59 AM
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Low pressure caused by the lack of input signals. Limp mode raises the pressure.

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post #71 of 81 (permalink) Old 05-12-2016, 06:12 PM
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HI Mark. I guess either my intermediate clutch or band may be sticking. In drive I have a slight drag when going from reverse to drive, then lets go and normal. In man 1 , i feel drag but not so much. Kinda weird. Any ideas? Only first or Man 1, but first gear only sticks momentarily
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post #72 of 81 (permalink) Old 05-15-2016, 01:23 PM
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Unplugged solenoid pack has the same symptoms

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post #73 of 81 (permalink) Old 05-15-2016, 03:04 PM
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Unplugged solenoid pack has the same symptoms
Isn't this where we started? And have you forgotten this post?
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I just remembered something that's relevant from way back in my memory. The forward clutch drum can't handle max pressure for very long before it blows apart. Running with no controller in M1 puts max pressure in the forward drum. Either stop doing this or expect your trans to blow apart soon.

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post #74 of 81 (permalink) Old 05-15-2016, 03:15 PM
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Well i jacked up the axle and i have all 4 speeds . i cannot figure out manual 1 . it idles ok and moves in man 1 , but stepping on the accelerator is like stepping on brakes . in drive it starts like that for a second when i shift from reverse to drive , then moves normally and goes through all the gears with solid shifts.
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post #75 of 81 (permalink) Old 05-15-2016, 03:17 PM
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I was referring to man 1 issue plugged or unplugged

Last edited by mikey89014; 05-15-2016 at 04:11 PM.
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