E4OD Shifting problem

[TheSmokinStroke2002]

I am currently driving my roommates obs. It has a semi built trans in it, not sure about what is done to it, but it is shifting all sorts of weird. It will blink the o/d light and start shifting weird, but at other times it will not blink it and just lock the converter way low.

When light blinks:

It will go 1st gear up until 2500+, shift to 2nd and lock the converter, unlock the converter, sometimes re lock or sometimes go back to 1st and free rev, then slam 3rd, then back to 2nd, then lock, unlock, then 1st. All sorts of weird shifting patterns.

When converter locks:
Leave stop light at maybe 10% throttle (when it clicks) and lock in 1st, then lock 2nd by 20, and be in 3rd lockup by 25-30mph.


-I replaced the CPS last week before i started driving it.
-I will be replacing the pigtail for the VSS this week as it threw a code for that today
-Does it with the chip in or out. Some days it will not do it at all, other days it will do it intermittently, other days it never stops.

Really at a loss for this one. It has Gearhead tuning if that matters.

When the trans is acting fine, the converter locks solid and it doesn't slip what so ever.

 

[POWER-STRUCK]

you may want to check operation of the multifunction switch, brake switch and EBP sensor/tube also

 

[TheSmokinStroke2002]

What do you mean by the multifunction switch..

 

[POWER-STRUCK]

What do you mean by the multifunction switch..

turn signal switch

 

[TheSmokinStroke2002]

how would that cause the trans to shift all weird?

 

[POWER-STRUCK]

brake light signal wires route thru it, and it could have an internal short causing it to lock and unlock the converter

 

[TheSmokinStroke2002]

brake light signal wires route thru it, and it could have an internal short causing it to lock and unlock the converter

Thats a new way to look at it.

 

[Mark Kovalsky]

Checking anything except what codes are stored in the computer is just a waste of time. Without knowing the codes you don't know where to look.

 

[TheSmokinStroke2002]

Checking anything except what codes are stored in the computer is just a waste of time. Without knowing the codes you don't know where to look.

What type of scanner would I need to check the trans code? The truck has a scangauge in it but I don't know if that is beneficial at all.

 

[rustbucket]

When you changing the VSS pigtail pull the sensor and clean the metal shavings off it, when enough get built up on it its hard for the sensor to read the tone ring. I would also check your MLPS and harness its pretty commen for the wires to break or the pins to get rusty. The brake switch would explain the converter locking in and out but you wouldnt think it would make it lock up early.

 

[907DAVE]

Just hope the problem isn't in the PSOM, those are getting hard to find nowadays.

 

[TheSmokinStroke2002]

When you changing the VSS pigtail pull the sensor and clean the metal shavings off it, when enough get built up on it its hard for the sensor to read the tone ring. I would also check your MLPS and harness its pretty commen for the wires to break or the pins to get rusty. The brake switch would explain the converter locking in and out but you wouldnt think it would make it lock up early.

What is the mlps?


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[TheSmokinStroke2002]

Just hope the problem isn't in the PSOM, those are getting hard to find nowadays.

What is the psom?


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[907DAVE]

Programmable Speedometer Odometer Module (part of the instrument cluster).

Basically it converts the A/C signal from the VSS to a digital signal the PCM uses to determine vehicle speed.

 

[TheSmokinStroke2002]

Programmable Speedometer Odometer Module (part of the instrument cluster).

Basically it converts the A/C signal from the VSS to a digital signal the PCM uses to determine vehicle speed.

Oh I gotcha.. That would make sense the speedo kinda jumps around. Figured trucks got 275k it's bound to have its quirks with speedo but if that's going out that might not be good. Any way to test it


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[Mark Kovalsky]

Yes, there is a way to test it. GET THE CODES READ.

If you want to read them yourself you need to buy a high end scan tool. They are a few thousand dollars. It makes sense to go to a good independent shop or to a Ford dealer and pay to get them read.

 

[97powerstroke]

Programmable Speedometer Odometer Module (part of the instrument cluster).

Basically it converts the A/C signal from the VSS to a digital signal the PCM uses to determine vehicle speed.

Can you just change it out or do you need a new Speedo? Mine's acting the same way.

 

[Wackerjr]

Check the 3rd brake light, and both taillights for a bulb out...

 

[rustbucket]

Manual lever position sensor, it senses what gear you have the shifter in.

 

[Mark Kovalsky]

Checking anything except what codes are stored in the computer is just a waste of time. Without knowing the codes you don't know where to look.

This is still true. If you don't have the codes read you will just waste your time and money.