e40d no shift, and no tach?????

[prepowerstroke]

hey guys my dads gotta 1990 ford f250 7.3idi with a E40D and hes got no tach and the transmission has only two gears like high and low i think its called limp mode but we cant figure out whats wrong we checked the tach sensor and the EEC(TCM) relay with no luck..... anyone know what to look for??

 

[Blind Driver2]

tach sensor went caput

 

[purg113]

If you have not done it already check the fuse under the hood. it is a 25 amp i think.

 

[homelessduck]

It won't shift correctly without input from the tach. How did you check the tach sensor?

 

[purg113]

mine did the same thing the tach died and i only had 2nd and overdrive. found a blown fuse under hood and fixed problem.

 

[homelessduck]

Did you check the TECA relay?

 

[Hardass559]

my 93 does that 2 i figured it was wireing never really look in to it bc i hafta put new cab on that truck any how but i will look in to the fuse thing in the morning just for fun

 

[prepowerstroke]

If you have not done it already check the fuse under the hood. it is a 25 amp i think.

where is this fuse at ??

 

[prepowerstroke]

tach sensor went caput

we took the tach sensor out and put it in my truck and worked just fine.

 

[prepowerstroke]

Did you check the TECA relay?

we took the relay out and clean the connections(were a little green) and put it back on there with no luck then put it on my truck and it work fine.

 

[OLDBULL8]

Look here, might help. http://www.oilburners.net/forums/showthread.php?59468-Tach-Sensor-testing

 

[icanfixall]

The E4OD REQUIRES three sensor feeds for it to operate properly. One is the tach. Another is the speedometer which has the speed sensor right at the cable imput to the trans tailshaft. And finally the injection pump throttle positioning switch. On the electric speedometers trucks I think the speed senser is in the rear differantial.. I great that you can remove the parts and test them on your truck. The problem will be found easier now. Probably the fuse like posted because so far what you have "tested" works fine and thats a good thing.

 

[Hardass559]

ther is a tranny computer too but the tach and the tranny dont work so something is not getting power its not tranny related its wireing in the truck the guy i got mine from sid something about it i dident pay attention to what he said cause i had no plans to use the e40dwhen i was done building the truck but my plans have changed sick of shifting lol

 

[Hardass559]

you ever figure this out i wounder what it was

 

[prepowerstroke]

mine did the same thing the tach died and i only had 2nd and overdrive. found a blown fuse under hood and fixed problem.

where is this fuse at? i havent been able to work on truck latley... dads been driving it to work every day hopefully this weekend we will look at it to see if we can find something wrong