Need information

[lgettler]

My 1990 7.3 with E4OD throws a blinking light at the wait to start panel I need help

 

[IDIoit]

i would change glow plugs and module

 

[gandalf]

My 1990 7.3 with E4OD throws a blinking light at the wait to start panel I need help

There are the magic words, "E4OD" and "blinking light".

How is the transmission shifting? That's a 4 speed transmission. Is it missing any gears in it's shift pattern? Are the shifts unnaturally hard, abrupt, harsh?

I can't remember where the OD light is on a 1990. On my '92 it's on the shift stalk/lever. Is it the OD light blinking?


Report back with answers to these questions.

 

[snicklas]

If I remember correctly on the Bricknose trucks (87-91) the E4OD "OD OFF" switch and light is a button on the lower dash panel, to the right of the steering column, next to the Wait to Start and Water In Fuel light panel. Is the amber light blinking on the OD-OFF switch blinking. On this switch:

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Or is it the the Red Wait to Start or Water In Fuel Light Blinking on this panel:

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That will help us get headed in the right direction.... As it could be vastly different things....

 

[lgettler]

Yes its the light on the overdrive panel that is blinking and also causes hard shifts.

 

[gandalf]

Yes its the light on the overdrive panel that is blinking and also causes hard shifts.

Your transmission is controlled by the TCM, transmission control module. The TCM needs 3 inputs to work correctly. 1) The tachometer signal. That sensor is located on the IP gear housing, forward and to the driver's side of the injector pump. It has a nut fitting, about 1 inch, and 2 wires. Pull the sensor and clean it. If the tach is working, try #3. 2) The FIPL, mounted on the driver's side of the injector pump. This can be adjusted with a multimeter. It has 3 wires. Get instructions. Also, it could have died. 3) The VSS, vehicle speed sensor, located on the rear differential, front side, upper section. It will have a wire. If the speedometer is working well, then look at the FIPL. Ask instructions.

If any one of these 3 items has died or needs adjustment, the transmission, E4OD, will go into limp mode. Don't drive very far this way.

 

[3Kp]

When mine blinked it only did it when I was hitting the brakes. I changed out my tach sensor no more blinking!

 

[madpogue]

Speaking of brakes, isn't the brake light switch another input to the E4OD?

 

[79jasper]

Yep.

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[trackspeeder]

When the OD OFF light is flashing, you have codes stored. Get it scanned before tossing parts at it.