Go Back   Ford Mustang Forums > Mustang > 5.0 Mustang > 94-95 Tech

Welcome to our Mustang forums where Mustangers come together to hang out, discuss and enjoy their favorite Mustang hobby with fellow Mustang enthusiasts. We invite everyone to read, post, and enjoy our Mustang forum as well as the many other sections of our site.

You are currently viewing our forums as a guest. By joining our community you gain access to post topics, communicate with members, upload your photos and access many other special features. Registration is fast, simple and free so why wait, join our Mustang community today! If you have any problems with registration or your account login, please contact support.

1994-1995 5.0 Mustang SN95 Tech Forum

5.0L Talk | 5.0L Tech | 94-95 Tech | 1979-1993   1994   1995   Upload Pictures | Timeslips | Power Adders | Mustang Tech 


Reply   Post New Thread
Unread 12-27-2011   #1 (permalink)
scottgt95 is offline Rookie


Joined: Mar 2011
Posts: 47 Threads: 7
 scottgt95's Country Flag
broomfield   Colorado
scottgt95 is on a distinguished road
Default 95 Mustang gt speedometer stopped working

So It's just as the title says. I have a 95 Mustang gt and the speedometer for some reason quit working on me. It's happened before but for some reason just started working one day. Then a few nights ago I was driving and it stopped working again. I've tried taking apart the instument cluster and nothing is solving the problem. I do have a Dallas Mustangs speed calibrater in the car. Could the issue be with the speed calibrater? Any ideas or inputs would be much appreciated.
scottgt95 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Sponsored Links
Advertisement
 
Unread 12-27-2011   #2 (permalink)
seanstrey is offline Made Member


Joined: Nov 2009
Posts: 588 Threads: 11
 View seanstrey's 5 photos
Thunder Bay
seanstrey is on a distinguished road
Default

Your VSS is a variable reluctance sensor so if you have access to a labscope you could backprobe it and either spin the sensor or lift the tires and runt he car in gear and see the signal you get. Its basically a magnetic pulse generator... so the faster you go the higher the frequency of pulses. If the waveform on the labscope doesnt look right, or there is no waveform at all you should replace the sensor.

If there is all 8 pulses per rotation of the sensor and if responds properly you should begin diagnosing other possible problems.
__________________
Rice.
seanstrey is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 12-27-2011   #3 (permalink)
scottgt95 is offline Rookie


Joined: Mar 2011
Posts: 47 Threads: 7
 scottgt95's Country Flag
broomfield   Colorado
scottgt95 is on a distinguished road
Default

Where can I get one of these "labscopes" and how do you use it? Thanks for the reply btw.
scottgt95 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 12-27-2011   #4 (permalink)
SPeace-ATL is offline GT Member

Classic Member


Joined: Oct 2009
Posts: 1,675 Threads: 4
 SPeace-ATL's Country Flag  View SPeace-ATL's HomePage
Atlanta   Georgia
SPeace-ATL is on a distinguished road
Default

It wouldn't hurt to pop the VSS out of the side of the transmission and see if the teeth on the little gear are in good shape.

If you have put that 23-tooth gear in there it will likely have lost some teeth... If this is the case, you should go with the more reliable 21-tooth gear and recalibrate the Speed-Cal!
__________________
Stan -
1965 5.0 Coupe /MAF/EFI/AOD/B303 Roller Cam

Mustang Manual Transmission Specialist
SPeace-ATL is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 12-27-2011   #5 (permalink)
scottgt95 is offline Rookie


Joined: Mar 2011
Posts: 47 Threads: 7
 scottgt95's Country Flag
broomfield   Colorado
scottgt95 is on a distinguished road
Default

I pulled out the sensor the first time the speedometer stopped working and there's no gear at all. These years don't use them.
scottgt95 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 12-27-2011   #6 (permalink)
SPeace-ATL is offline GT Member

Classic Member


Joined: Oct 2009
Posts: 1,675 Threads: 4
 SPeace-ATL's Country Flag  View SPeace-ATL's HomePage
Atlanta   Georgia
SPeace-ATL is on a distinguished road
Default

Quote:
Originally Posted by scottgt95 View Post
I pulled out the sensor the first time the speedometer stopped working and there's no gear at all. These years don't use them.
While it is true that beginning in 1994 there is no longer a speedometer cable there STILL IS A GEAR inside that turns the VSS to make the electronic signal to drive the speedometer.

Beginning in 1999 that gear was eliminated by a metal "reluctor" wheel and the sensor became an "OSS" rather than a "VSS"

If there is no gear in there then you are onto the problem...

UNLESS... You mentioned that you have a Speed-Cal.
IF your transmission has been replaced with a 99-04 type it will have that OSS and no gear. The Speed-Cal will translate the signal to the correct number of pulses generated by a VSS which your speedometer was designed for.
__________________
Stan -
1965 5.0 Coupe /MAF/EFI/AOD/B303 Roller Cam

Mustang Manual Transmission Specialist
SPeace-ATL is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 12-27-2011   #7 (permalink)
scottgt95 is offline Rookie


Joined: Mar 2011
Posts: 47 Threads: 7
 scottgt95's Country Flag
broomfield   Colorado
scottgt95 is on a distinguished road
Default

What your saying sounds right, but the speedometer has been working (without a gear on the sensor) for a couple of months. This is the second time my speedometer has quit and I thought about that gear the first time it happened. I pulled the sensor and turns out there was no gear. A buddy of mine works at a ford dealership and the mechanic there said there wasn't supposed to be any gears on those sensors after 93.
scottgt95 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 12-27-2011   #8 (permalink)
scottgt95 is offline Rookie


Joined: Mar 2011
Posts: 47 Threads: 7
 scottgt95's Country Flag
broomfield   Colorado
scottgt95 is on a distinguished road
Default

Oh and btw my transmission is a tremec t5
scottgt95 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 12-27-2011   #9 (permalink)
SPeace-ATL is offline GT Member

Classic Member


Joined: Oct 2009
Posts: 1,675 Threads: 4
 SPeace-ATL's Country Flag  View SPeace-ATL's HomePage
Atlanta   Georgia
SPeace-ATL is on a distinguished road
Default

Quote:
Originally Posted by scottgt95 View Post
Oh and btw my transmission is a tremec t5
Ok, a 94/95 transmission would not have said Tremec on the side.

It is looking more like you have a 99-04 V-6 transmission.

Does the speed sensor cable connect STRAIGHT in towards the transmission, or is it at a RIGHT-ANGLE?
__________________
Stan -
1965 5.0 Coupe /MAF/EFI/AOD/B303 Roller Cam

Mustang Manual Transmission Specialist
SPeace-ATL is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 12-27-2011   #10 (permalink)
scottgt95 is offline Rookie


Joined: Mar 2011
Posts: 47 Threads: 7
 scottgt95's Country Flag
broomfield   Colorado
scottgt95 is on a distinguished road
Default

I cant quite remember. I wanna say it went in perpendicular to the tailshaft.
scottgt95 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 12-27-2011   #11 (permalink)
PANTYEATR is offline GT Member


Joined: Jul 2011
Posts: 1,735 Threads: 111
 PANTYEATR's Country Flag
orlando   Florida
PANTYEATR is on a distinguished road
Default

pics of the tranny ???
__________________
1995 Mustang Cobra, 5.0 V8, T5 transmission

*currently under restoration*

could you repeat all of that, I wasn't listening???
PANTYEATR is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 12-27-2011   #12 (permalink)
SPeace-ATL is offline GT Member

Classic Member


Joined: Oct 2009
Posts: 1,675 Threads: 4
 SPeace-ATL's Country Flag  View SPeace-ATL's HomePage
Atlanta   Georgia
SPeace-ATL is on a distinguished road
Default

Quote:
Originally Posted by PANTYEATR View Post
pics of the tranny ???
Or the number off of the aluminum tag on a tail housing bolt.

That 99+ V-6 T-5 will probably be tagged 1352-260.

This just about has to be what he has...

So, we have an intermittent Speedometer.
The Cluster was replaced.

Then the OSS sender, the Speed-Cal, or some wiring in between would remain to be suspect...
__________________
Stan -
1965 5.0 Coupe /MAF/EFI/AOD/B303 Roller Cam

Mustang Manual Transmission Specialist
SPeace-ATL is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 12-29-2011   #13 (permalink)
scottgt95 is offline Rookie


Joined: Mar 2011
Posts: 47 Threads: 7
 scottgt95's Country Flag
broomfield   Colorado
scottgt95 is on a distinguished road
Default

Sorry I have no pics of the transmission. I won't have time to look at that tailshaft tag until maybe this sunday. I'll see if I can do it any sooner.
scottgt95 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 12-30-2011   #14 (permalink)
scottgt95 is offline Rookie


Joined: Mar 2011
Posts: 47 Threads: 7
 scottgt95's Country Flag
broomfield   Colorado
scottgt95 is on a distinguished road
Default

Also, if I have to break hard or I disengage the clutch while braking the engine stalls. Just thought I'd put that out there just in case it helps narrow down the issue. It only does this when the speedo isn't working.
scottgt95 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Unread 12-30-2011   #15 (permalink)
SPeace-ATL is offline GT Member

Classic Member


Joined: Oct 2009
Posts: 1,675 Threads: 4
 SPeace-ATL's Country Flag  View SPeace-ATL's HomePage
Atlanta   Georgia
SPeace-ATL is on a distinguished road
Default

Quote:
Originally Posted by scottgt95 View Post
Also, if I have to break hard or I disengage the clutch while braking the engine stalls. Just thought I'd put that out there just in case it helps narrow down the issue. It only does this when the speedo isn't working.
Actually that is a clue. The pulses from the speedometer sender are passed to the engine computer to tell it if the car is in motion or just idling around, so yes, if it is confused it may do the wrong thing!
__________________
Stan -
1965 5.0 Coupe /MAF/EFI/AOD/B303 Roller Cam

Mustang Manual Transmission Specialist
SPeace-ATL is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Sponsored Links
Advertisement
 
Reply   Post New Thread



Thread Tools



Mustang Photos
Mustang Links    Top Sites    RSS    Link To Us    Add to Favorites    Archive    Terms of Use    Site Rules    Privacy    Contact    Sponsors    Advertise   
AllFordMustangs is not affiliated with or endorsed by Ford Motor Company. ©Copyright 2002-2011 All Auto Enthusiasts Network

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162