I just checked the tps for voltage and it has the following- top wire (i think brown with a red stripe?) 0.020 volts middle wire (tan and white) 0.805 volts and 4.07 volts @ wot and bottom wire (black and white) 5 volts. are these correct or is my tps buggered? any help greatly appreciated, i don't have a hanes manual yet. also would a faulty tps cause the E4OD to shift erratic and kick in and out of od? also also would a faulty tps cause the tach to be innacurate? thanks in advance.

ps its a 92 7.3l E4OD 4x4.

 

if your tach is irratic, it will make your tranny shift irraticly. i would change your tach sensor and it will probobly fix it. they are about 50 bucks at ford. its the small sensor with 2 wires right beside where you put the oil in it, can't miss it. right there in front.

 

Put a pin into the middle wire of the tps connector,put the neg lead of your meter to the neg batt post,and the pos lead to the pin you put in the connector(connector needs to be plugged into the tps).With the key on engine not running set the tps to 1.05v-1.1v,wot should be min 3.8v to a max of 4.3v.You may have to fine tune the settings to suit your driving habits and your preferred shift firmness.Btw your tach needs to be working properly.

 

International Truck dealers generally have the same parts for much less than the Ford dealer. If you have one in the area, check them for a price comparison.

 

thanks for the tips!!! any way of checking the tach sensor b-4 paying my hard earned dollars? (could be a broken wire, wouldn't suprise me on this rig) the tach reads zero when foot off accelerator but as soon as i move the pedal it jumps. basically if i'm driving down the road and let completely off the pedal the tach drops to zero-touch the throttle and boom, jumps right up.

 

ok i see now why you would think it has something to do with the tps, look to see if the wires going to the tach are in the way of the throttle linkage in any way. rubbing the wires raw or moving a wire that is broken enough to make it lose connection or grounding out. i don't think the tps has anything to do with the tach since the standard diesels have no tps. but the tach plays an important part in the tranny shifting.

 

what else could cause the tach to jump like that. i was just in the engine bay last nite and didn't notice any wires right close to the linkage-i was meddling with pump advance.

 

To test the tach sens,remove sens and check across the sens terminals,resistance should be 2000-3000 ohms(make sure sens is away from metal as that will screw with the readings),if its in spec,your tach is the trouble.Also check engine harness on the driver side of the engine bay for clean contacts.

Also i forgot to mention that when you are checking the tps voltage do it on a warmed up engine or unplug the fast idle sol,sorry.

 

Does the speedo jump around as well?