Help - VSS, Speedometer
5th Wheeling
Joined: Sep 2010
Posts: 42
Likes: 5
Copy that nogo, I was going off what I had read on this forum about where the speedo picked up its signal, but in the end it was the water in the GEM that was causing all the havoc. Now just trying to find where the water is coming from.
Post Fiend
Joined: Sep 2003
Posts: 6,096
Likes: 26
From: Mesa AZ
Very time consuming and frustrating. I could only produce water after a heavy rain, I think i am down to the weather stripping on the cab near the rear door corner. No matter how much water I put on it either through a hose or sprinkler I cannot get it to leak. I sprayed windex along top of door onto weather stripping and then used low pressure shop air along inside of door and could produce bubbles in one location in weather stripping. Don't know if this is a good way or not but trying anything at this point. I am down to replacing the weather strip and/or reseal front windshield.
The VSS and ABS sensor for the rear axle are the same part, located on the differential housing. The transmission has TSS (Turbine Shaft Speed) and OSS (Output Shaft Speed) sensors. (Assuming 4R100 transmissions....)
5th Wheeling
Joined: Sep 2010
Posts: 42
Likes: 5
Thanks shake-n-bake for the info on the sensor. Pretty sure it is the windshield, after washing the truck today found a drip on the "A" pillar, I left the plastic off so I could monitor. After spraying upper right windshield I could get water along edge of window seal and it then travels down to "A" pillar where it looks like it travels down between 2 pieces of steel that make up "A" pillar and then seeps out the bottom of "A" pillar, which in turns puts the water straight above the GEM, it first drips down onto the small defroster tube leading to left side of dash for window. From there it can drip down and find its way to GEM module, I think 
A little more verification and will be ready to bring in the glass man for a reseal.
A little more verification and will be ready to bring in the glass man for a reseal.
New User
Joined: Apr 2014
Posts: 5
Likes: 0
vss help
Hay any luck with your excursion im having the same problem with my speado mph not working abs light on od light flashing but runs fine just changed the vss and nothing happen oh I have a 2003 excursion 5.4 v8
Thread
Thread Starter
Forum
Replies
Last Post
slimfitz
1999 - 2016 Super Duty
1
May 16, 2016 05:25 AM
brian42
1999 - 2003 7.3L Power Stroke Diesel
15
Aug 18, 2015 02:46 PM
Archimandrite
1987 - 1996 F150 & Larger F-Series Trucks
3
Aug 15, 2012 08:56 AM
