1989 7.3 idi computer

[SethB]

1989 f-350 idi E40D transmission

Could anyone tell me if my computer is bad? My tach is not working, and trans only has high and low. (limp mode?)
I have done research, looks like 3 main components, Ecu, tach sensor, and speed sensor. I put in a new tach, sensor, and my speed guage works. This is the only other thing i can come up with besides wiring, which could be possible.

I have attached some pictures, any help is greatly appreciated.


(see the off color blue, and the brown)

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[79jasper]

I would say it's a little burnt. Lol

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[chillman88]

I can't tell on my phone but I trust 79jasper.

Does the TCM go into limp mode if it doesn't get a tach signal? I'd hate for you to replace the TCM if the tach is really the problem...

I can't say if it's the same or not but if you need a TCM RockAuto does carry them.

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[SethB]

Would you guys say that it may be the problem? Motor sounds good, starts right up, but I have no compression in one of the pistons. But that is besides the point.
Some other things i have looked up is the TECA relay. Does anyone know where that is at?

I would say it's a little burnt. Lol

Sent from my SM-G892A using Tapatalk

I can't tell on my phone but I trust 79jasper.

Does the TCM go into limp mode if it doesn't get a tach signal? I'd hate for you to replace the TCM if the tach is really the problem...

I can't say if it's the same or not but if you need a TCM RockAuto does carry them.

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[bbjordan]

It looks like the capacitor leaked it's elecrolyte. It's common for capacitors from this era to fail like that. How handy are you with a solder iron? You might get away with just replacing the 47 uF capacitor. MIGHT...

 

[SethB]

I think i know a guy who could do it. Would it just be worth it in the long run to buy a new one?

 

[Sidewinded_idi]

Does your speedo work?

 

[SethB]

yes.

Does your speedo work?

 

[79jasper]

I think i know a guy who could do it. Would it just be worth it in the long run to buy a new one?

Maybe. But it's worth a shot to fix yours.

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[Alwaysreadyrob]

I have a 1994 F 250 turbo IDI.
I never knew it had a computer.

 

[saburai]

I think i know a guy who could do it. Would it just be worth it in the long run to buy a new one?

Depends, how much is a new one?

 

[Runningaford]

I've not had any time to work on it, but my brother's truck, with the automatic has a similar problem as the OP's, except it'll shift through all gears, and the torque converter engages, and disengages correctly.

 

[Thewespaul]

I have a 1994 F 250 turbo IDI.
I never knew it had a computer.

The idi does not have a computer, however the e40d trans is electronically controlled and uses a computer.

 

[trackspeeder]

Would you guys say that it may be the problem? Motor sounds good, starts right up, but I have no compression in one of the pistons. But that is besides the point.
Some other things i have looked up is the TECA relay. Does anyone know where that is at?

TCM relay is on the drivers side fender.

 

[franklin2]

You should be able to pull trouble codes from it. This link shows you how.

http://thorssell.net/hbook/eectest.html