Thanx....i will whip this sob yet....lol

 

C143 plug:


/

 

What size tire are you running on this truck? I saw this question asked earlier but did not see a reply.

 

stock tires are on the truck....but don't know if previous owner had different tires on then put on stock to sell it

 

ok..cruise control works fine.....I put in a cluster from a 94 (with tach....which my truck didn't have) with my original speedo.....it seems to shift fine except when it shifts to 2nd it quickly shifts to 3rd but the rpms aren't high enough for the change?????

 

Did you put the 1993 PSOM in the 94 cluster?

 

yes....never separated the PSOM from the actual speedo

 

Without rereading the whole Thread did you check for codes?
Sounds like the TPS might be bad.
I will have to go and read the computer logic on the shifts this may take awhile.

 

Have no way to check codes....back on first or second page of this thread i posted codes from when i started this....the TPS is one of the first things i replaced....how can i test it to make sure its working right?

 

The TPS has three positions (see logic below).
Make sure you unhook the battery for 15 minutes after you replace any sensor.
So you can take the wire going back to the computer and check it at the computer plug.
It should be about .8 to 1.0 volt closed and about 4.9 volts at WOT.
The center position should be about half the WOT and closed throttle positions or about 2.5 volts.
You can also look at this link:
Ford Fuel Injection » Throttle Position Sensor (TPS)


E4OD logic:
In the normal Drive/Overdrive position, the desired gear is calculated based
on a maximum WOT RPM shift point or as a function of throttle position versus
vehicle speed. All shift points are adjusted for altitude. There are no
excluded shifts in automatic mode, that is 1 - 4 shifts or 3 - 1 shifts are
permitted if the calibration calls for it.


TPS logic:
THROTTLE MODE SELECTION

OVERVIEW

The throttle mode scheduler is used to determine what engine operating region
is currently extant. The variable APT (At Part Throttle flag) is used to
indicate throttle mode and is assigned the following values:

THROTTLE MODE APT
------------------- ---
Closed Throttle -1
Part Throttle 0
Wide Open Throttle 1

The value of APT is determined by the logic shown on the following page.
Briefly, throttle angle breakpoints, in terms of counts, are used to define
the CLOSED/PART THROTTLE and PART/WIDE OPEN THROTTLE transitions. Hysteresis
is incorporated in both breakpoints to prevent jitter between modes.

TP_REL is a parameter which indicates the amount of throttle movement beyond
the closed throttle/idle setting. TP_REL is computed by subtracting RATCH
from TP. Larger values of TP_REL indicate wide open throttle, smaller values
of TP indicate part throttle, and near zero TP_REL indicates closed throttle.
The variable RATCH is the output of a ratchet algorithm which continuously
seeks the minimum throttle angle corresponding to a CLOSED THROTTLE position.
This alleviates the necessity to set the throttle position sensor at an
absolute position and compensates for system changes and differences between
vehicles. The ratchet algorithm uses filtered throttle position for the
determination of RATCH. RATCH is initialized to the non-calibratable value
RATIV, currently set to 250 counts.

A more detailed explanation of the throttle position ratchets and throttle
position filter is contained in the SYSTEM EQUATIONS section.

 

i did notice that when I take off I can control the shift from 1st to 2nd somewhat by lifting off the throttle so it won't take so long to shift......would that mean something withe TPS?...I also read in another post that if idle stop screw has been messd with....it can cause problems with TPS

 

btyw.....drove the truck twice....shifted ok.....drove it the third time....back to long shift from 1st to 2nd.....wtf...lol

 

The computer learns where the throttle is when you turn on the key. You should never touch the throttle when turning on the key. The stop screw is more to keep the throttle plates from jamming closed than anything else. It also has to be adjusted so the plates are closed so the IAC valve has full control over the air when the throttle is closed.

 

Sounds like you need to monitor the two shift wires maybe with two leds. I did that with my F53 so I knew what the computer was telling the transmission to do.
There may be some computer scanners you can buy that will tell you when the computer tells it to shift.

Why I say all of this is it sounds like you may have a problem when the transmission warms up. You may have a sticking solenoid in the solenoid pack or a part in the transmission that is sticking.
Then if you see the computer tell it to shift and it does not then you know that it is in the transmission.

 

Here's a site that can help with how to electronicly monitor/test transmissions: Testing Electronic Transmission—Domestic Vehicles

Good reading info on the Ford trannys and others too.

Subford, what book you have that has the info in it? I been looking around for some time but not found anything.