Tach sensor on 351 windsor?
Thread Starter
|
New User
Joined: Apr 2011
Posts: 19
Likes: 0
Tach sensor on 351 windsor?
I have been having problems with hard shift 1st to 2nd with E40d and have been researching issue through threads.... Seems the tach sensor is the place to start but I'm not sure that 351 windsor has one. It may only exist on the diesel model. Help would be great.... I intend to check all the wiring as well as I believe my issue is electrical. I have serviced trans and found nothing in the pan, and it shifts into each gear without issue when selected on the column. In OD it hangs onto #1 then slams into #2 then ok. I went to the ford dealer and asked for a tach sensor for this motor and they couldn't find it....please help i need my dumper for the spring.
Postmaster
Joined: Aug 2005
Posts: 4,728
Likes: 8
From: Cleveland, TN
If you do a little searching you will find LOTS of E4OD shifting problems..
Here is a short list to get you started. Ford Truck Enthusiasts Forums - Search Results
First thing to do is Pull the DTC codes.. It will be easier with a code reader, but if you don't have one here is how to read them with only a paper clip.. Fuel Injection Technical Library » How To Run a Self-Test
About 99% of E4OD shift problems are a result of a trouble code.....
Here is a short list to get you started. Ford Truck Enthusiasts Forums - Search Results
First thing to do is Pull the DTC codes.. It will be easier with a code reader, but if you don't have one here is how to read them with only a paper clip.. Fuel Injection Technical Library » How To Run a Self-Test
About 99% of E4OD shift problems are a result of a trouble code.....
Thread Starter
|
New User
Joined: Apr 2011
Posts: 19
Likes: 0
Thankyou!
Thanks for the info. Now that I know the sensor is only on the diesel I can move on to something useful. I do have ford code reader will it read any codes if I am not getting a check engine light and also not getting flashing od light? Is the regular code reader going to show me the trans codes or is it a seperate reader I will need for the trans? I am only familiar with the obd3 reader.
Thread Starter
|
New User
Joined: Apr 2011
Posts: 19
Likes: 0
Still shifts like I'm getting bumped by a train!Argh!
e40d is still giving me issues. I pulled the codes and the only tans related code was for the vss.. This actually gave me great hope. I thought speed sensor "the trans doesn't know what seed it's at and therefore doesn't know what gear to select or when to shift. So I replaced the vss sensor located on the the rear diff. I have replaced the trans filter and fluid and found nothing in the pan so I assume my issue is sensor or wiring. No cigarette. Still shifting hard from 1st to second. In addition, the trans mode selector button light on the shifter has never blinked before and now that I have changed this sensor it has started blinking. Any suggestions?
I am going to go out and pull codes again as it was to late last night (dark) to do so. hopefully it is throwing some new codes that i can chase. Trans has the right amount of fluid. Oil is fresh and at right level. Coolant is topped off. I am able to manually select all gears and hear them engage and I can drive the truck as long as I shift it myself into second and then once at OD speed switch it back.
I am going to go out and pull codes again as it was to late last night (dark) to do so. hopefully it is throwing some new codes that i can chase. Trans has the right amount of fluid. Oil is fresh and at right level. Coolant is topped off. I am able to manually select all gears and hear them engage and I can drive the truck as long as I shift it myself into second and then once at OD speed switch it back.
Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
The VSS sensor on the rear end very seldom goes bad unless you brake it.
Replacing the VSS sensor seems to make thing worse by reading a lot of the post on here and very seldom ever fixes the problem.
The way the VSS sensor is made I do not see how one could ever go bad without being broken.
A jumpy speedometer can be caused by junk stuck to the VSS sensor if you have a bad rear end but that is not the VSS sensors fault.
I know just about everybody on here says to change the VSS sensor first but I think that is bad advice.
What happens there is a gap that has to be maintained between the tone gear in the rear end and the Voltage generating VSS sensor. When you replace it, it seems the gap is not the same as before and you have bigger problems. Some have left the RABS module unplugged to get it to work again after replacing the VSS sensor.
Did your speedometer work OK before you changed the VSS sensor? If so your problem may be in either the Speed Control Module or the PSOM.
Replacing the VSS sensor seems to make thing worse by reading a lot of the post on here and very seldom ever fixes the problem.
The way the VSS sensor is made I do not see how one could ever go bad without being broken.
A jumpy speedometer can be caused by junk stuck to the VSS sensor if you have a bad rear end but that is not the VSS sensors fault.
I know just about everybody on here says to change the VSS sensor first but I think that is bad advice.
What happens there is a gap that has to be maintained between the tone gear in the rear end and the Voltage generating VSS sensor. When you replace it, it seems the gap is not the same as before and you have bigger problems. Some have left the RABS module unplugged to get it to work again after replacing the VSS sensor.
Did your speedometer work OK before you changed the VSS sensor? If so your problem may be in either the Speed Control Module or the PSOM.
Trending Topics
Thread Starter
|
New User
Joined: Apr 2011
Posts: 19
Likes: 0
Thanks for the reponse. The vss that I pulled out actually seperated into two at the magnet position. Was it damaged before I pulled it? maybe I was to hard on it taking it out I don't know. The new sensor is in and it hasn't caused any further issues it just hasn't slved the original issue. Today I will start going over all the wiring related to the trans and see what new codes have been saved. 
. gotta figure it out!
. gotta figure it out!
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
The Southernmost Mod
Joined: Dec 2004
Posts: 6,902
Likes: 20
From: Caracas, Venezuela
The tone ring inside the differential can go bad too, that ring is the one that feeds the signal for the VSS. Did you by any chance have any trouble with you differential lately? broken teeth on any of the gears? it could have hurted your ring, making your speedometer needle jumpy, just like it did with mine:
Uploaded with ImageShack.us
The tone ring is the smaller one, attached to the back of the main ring of the differential. I'll be doing the work to replace it, in one week from now (given i find all the info i require before).
Uploaded with ImageShack.us
The tone ring is the smaller one, attached to the back of the main ring of the differential. I'll be doing the work to replace it, in one week from now (given i find all the info i require before).
Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
Yes a lot of the VSS sensor get broken when they are removed.
But if you are getting a VSS code after you clear the codes and drive it then I would say your transmission and its wiring are OK.
You can try unplugging the RABS module to see if that helps but more than likely it is the PSOM.
Some have fixed the PSOM by resolding some of the parts on the board.
You can check the signal from the PSOM to the PCM Computer or the signal generated by the VSS sensor to the PSOM and RABS module.
But if you are getting a VSS code after you clear the codes and drive it then I would say your transmission and its wiring are OK.
You can try unplugging the RABS module to see if that helps but more than likely it is the PSOM.
Some have fixed the PSOM by resolding some of the parts on the board.
You can check the signal from the PSOM to the PCM Computer or the signal generated by the VSS sensor to the PSOM and RABS module.
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
Several sensors are key for correct transmission function including the VSS and TPS and anything internal to the trans itself, but because the same computer controls both engine and trans nearly all sensors inputs will have an effect on powertrain operation so you can't ignore any codes.
Logistics Pro
Joined: Jul 2009
Posts: 3,635
Likes: 3
From: Lansdale, PA
With enough reading you'll start finding info regarding the transmissiOn causing the hard shifting issue. There are a few things in the valve body that stick and cause erratic shifting.
My truck had only 25k on it when I got it 3 years ago. It shifted erratically quite frequently.
Very hard 1-2 shifts at moderate throttle and severe shifts 2-3 at low throttle.
When was the last time you replaced the trans fluid.
90% of my shifting issues were fixed when I flushed and replaced the fluid and filter on my truck (after another month of driving anyway)
First dump a can of seafoam in the trans. Then drive it 75 miles. Or 100 if you're not inpatient. Then follow filter/flush instruction found on the forum.
Replace with a quality fluid of your choice.
Read about the punisher valvebody and what problems it solves. I'm upgrading mine soon.
My truck had only 25k on it when I got it 3 years ago. It shifted erratically quite frequently.
Very hard 1-2 shifts at moderate throttle and severe shifts 2-3 at low throttle.
When was the last time you replaced the trans fluid.
90% of my shifting issues were fixed when I flushed and replaced the fluid and filter on my truck (after another month of driving anyway)
First dump a can of seafoam in the trans. Then drive it 75 miles. Or 100 if you're not inpatient. Then follow filter/flush instruction found on the forum.
Replace with a quality fluid of your choice.
Read about the punisher valvebody and what problems it solves. I'm upgrading mine soon.
Thread Starter
|
New User
Joined: Apr 2011
Posts: 19
Likes: 0
Well, fingers crossed it doesn't return. I drove the truck a bit yesterday and w/ the new speed sensor fresh fluid and filter it started shifting better. I found when I selected overdrive off ( light ON) on the gear selector button it shifted well, just held onto 1st gear a little bit to long. As I drove it kept getting better. I added some lucus trans fluid and went through each gear thirty or forty times and then tried it again.................Guess what? it shifts like a dream.......I will reset all fo the codes today and see if anything comes up again. Thanks for all of the suggestions and help.
Thread
Thread Starter
Forum
Replies
Last Post
Prototypemech
Pre-Power Stroke Diesel (7.3L IDI & 6.9L)
2
Dec 2, 2013 08:54 PM
rucountry
1987 - 1996 F150 & Larger F-Series Trucks
4
Dec 9, 2011 04:59 PM
rotralisabe
1987 - 1996 F150 & Larger F-Series Trucks
7
Jun 22, 2010 06:44 AM
saengjwi
Pre-Power Stroke Diesel (7.3L IDI & 6.9L)
5
Sep 6, 2006 08:10 AM
GunNut
Pre-Power Stroke Diesel (7.3L IDI & 6.9L)
5
Aug 19, 2004 09:12 PM
