Ford explorer 1966 transmission problem

manuelitochelito · 02-20-2012, 11:32 PM

Hi i really need some help with mi explorer 1966

i just install the trasmission renew and a use trasfercase about tree months ago and now start lossing power now is not working on drive i need to start on 2 and when get speed i swich to d but is getting worse now

*buckwill* · 02-20-2012, 11:41 PM

ola manual,,, do you mean 1996???these are very knowledable people here but they need more info,, 1996??? engine size, 4.0??? 5.o???

too_many@verizon · 02-21-2012, 02:06 AM

I have the same vehicle, 1996 4.0 Explorer XLT. Been around the block on this problem. The specific physical symptoms are; no 2-3 upshift unless I manually start out in 2nd then shift to Drive a bit late or starting out in Drive, let 2nd run up to 3500 rpm, let off the the gas pedal completely and get back in the gas when I feel it shift.
Electrical symptoms include MIL light and code P0756 and occasionally have the O/D light flashing which indicates the vehicle is in limp mode.
So far I have had 2 different valve bodies in it due to what I have seen looking at many forum posts and Ford TSBs, no improvement. Today I got technical on it having purchased a Ford transmission troubleshooting book by Mandy Concepcion. According to the information in the book, the 4R55E trans. shift solenoid combinations are;
1st gear- only Sol. 1 is on
2nd gear- Sols. 1 & 2 are on
3rd gear- All Sols. off
4th gear- only sol. 3 is on
The solenoids are supplied Batt. voltage and the PCM supplies ground to activate them. (Shift Sol. 1 = PCM pin 27, 2 = pin 1, 3 = pin 53) looking at the firewall pin 1 is on the bottom left, I back probed it and used my Fluke meter on a drive test (it will read Batt. voltage when off, and around 200 - 300 mv when on) my trans is doing what it is told to, my PCM is not releasing the #2 or B solenoid when it should (since for 3rd gear all solenoids should be off) when I drag 2nd out and release the gas (and wait...) I see the meter go back up to 14V and there's 3rd like it should be.
Now the question is, do I need a PCM or is there another reason the (faulty input from another sensor maybe ?) PCM doesn't make the 2 -3 upshift when it should. I checked the TPS with my Fluke 97 scope, tapping the sensor w/screwdriver handle, smooth trace. I will try to find a bone yard PCM to try.
I hope this helps, let me know if you need any other info.

02-20-2012, 11:32 PM	#1
manuelitochelito Wannabe Elite Explorer FORD EXPLORER 1966 Join Date: Feb 2012 Posts: 1 Vehicle Specs (Original Poster)	Ford explorer 1966 transmission problem Hi i really need some help with mi explorer 1966 i just install the trasmission renew and a use trasfercase about tree months ago and now start lossing power now is not working on drive i need to start on 2 and when get speed i swich to d but is getting worse now

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02-20-2012, 11:41 PM	#2
buckwill Elite Explorer trona calif 1998 sport Join Date: Feb 2010 Posts: 241 Vehicle Specs	ola manual,,, do you mean 1996???these are very knowledable people here but they need more info,, 1996??? engine size, 4.0??? 5.o??? __________________ if my memory was getting shorter would i know???,, disabled viet vet, retired navy,, 98 exploder sport sohc 4.0,, retired macinist,gas and steam turbine millwright,, ive arrested, stroked twice and i mispell lots,

02-21-2012, 02:06 AM	#3
too_many@verizon Wannabe Elite Explorer NJ 1996 Ford Explorer Join Date: Feb 2012 Posts: 3 Vehicle Specs	I have the same vehicle, 1996 4.0 Explorer XLT. Been around the block on this problem. The specific physical symptoms are; no 2-3 upshift unless I manually start out in 2nd then shift to Drive a bit late or starting out in Drive, let 2nd run up to 3500 rpm, let off the the gas pedal completely and get back in the gas when I feel it shift. Electrical symptoms include MIL light and code P0756 and occasionally have the O/D light flashing which indicates the vehicle is in limp mode. So far I have had 2 different valve bodies in it due to what I have seen looking at many forum posts and Ford TSBs, no improvement. Today I got technical on it having purchased a Ford transmission troubleshooting book by Mandy Concepcion. According to the information in the book, the 4R55E trans. shift solenoid combinations are; 1st gear- only Sol. 1 is on 2nd gear- Sols. 1 & 2 are on 3rd gear- All Sols. off 4th gear- only sol. 3 is on The solenoids are supplied Batt. voltage and the PCM supplies ground to activate them. (Shift Sol. 1 = PCM pin 27, 2 = pin 1, 3 = pin 53) looking at the firewall pin 1 is on the bottom left, I back probed it and used my Fluke meter on a drive test (it will read Batt. voltage when off, and around 200 - 300 mv when on) my trans is doing what it is told to, my PCM is not releasing the #2 or B solenoid when it should (since for 3rd gear all solenoids should be off) when I drag 2nd out and release the gas (and wait...) I see the meter go back up to 14V and there's 3rd like it should be. Now the question is, do I need a PCM or is there another reason the (faulty input from another sensor maybe ?) PCM doesn't make the 2 -3 upshift when it should. I checked the TPS with my Fluke 97 scope, tapping the sensor w/screwdriver handle, smooth trace. I will try to find a bone yard PCM to try. I hope this helps, let me know if you need any other info.