| Author | Message | ||
     Jeff Conrad (Jwconrad) Member Username: Jwconrad Post Number: 70 Registered: 02-2002 |
I started getting the tale tale signs of a bad vss, feeling like the key was being turned off and back on, based on info from this bb so I purchased a new one and installed it. After install speedo was not working so I removed and reinstalled, checked connection still same problem. Re-installed old vss and speedo started working again so I assumed that I got hold of a bad part and convienced the dealer to replace it. Reinstalled new part today and speedo was working until switch was turned off and then restarted, now speedo is not working again. Any ideas, is it possible I have gotten two bad parts??? Jeff | ||
| Randall Smith (Mr_smith) Member Username: Mr_smith Post Number: 58 Registered: 04-2003 |
Hello Jeff Obviously it is not likely that you got two bad sensors. But I have only observered D1 owners having "VSS problem", so who knows. Test it with a meter. Your best bet might be to test the whole speed sensor circuit using the Electrical Trouble Shooting Manual. Randall | ||
| Jeff Conrad (Jwconrad) Member Username: Jwconrad Post Number: 72 Registered: 02-2002 |
I am still having this problem. Today I removed the VSS again (the second new part) and like the first, the center pin that fits in the transfer case was out of the sensor. On my original part the center pin appears to be attached, the pin goes through the plastic circle that has a flat side and the plastic is attached to the sensor. On both of the new parts, the plastic circle is loose and it appears that there is enough clearance when installed that it pulls out of the sensor rendering it usless. I re-installed my old part and the speedo started working again but it is to the point that it causes misfires at highway speed and needs to be replaced. Am I missing something here or have I really gotten two bad parts? | ||
| andrew adia (Drew) New Member Username: Drew Post Number: 36 Registered: 03-2003 |
Jeff, Sounds like you may have possiby got two bad parts. I was told, that connection that is loose on the new part has to do with the speedometer control and if not properly connected the speedo. will not work. Can you squeez the plastic circle with some needle nose pliers so it makes a better connetction. Not a great or permanent fix though. I wold try to get another part. Drew | ||
| andrew adia (Drew) New Member Username: Drew Post Number: 37 Registered: 03-2003 |
Or maybe add some dielectric grease in the connectors. Drew | ||
| Jeff Conrad (Jwconrad) Member Username: Jwconrad Post Number: 73 Registered: 02-2002 |
It is not the electrical connection that is the problem, it is the acutal pin that goes into the transfer case. It looks like the end of a speedometer cable. | ||
| Eric J Hendrickson (Ejs_xd) New Member Username: Ejs_xd Post Number: 6 Registered: 09-2003 |
Nice thread of info. Jeff, I am about to embark on the same adventure with a '97 XD. Do you have any pointers/lessons learned? Eric | ||
| Jeff Conrad (Jwconrad) Member Username: Jwconrad Post Number: 74 Registered: 02-2002 |
Eric, the swap is really easy, see the tech article. The one pointer that I found is that to help line up the sensor to fit in the drive I threaded the hex bolt one or two threads which leaves enough clearance to rotate the sensor until it lines up with the drive in the transfer case. It is a tight squeeze and visual is limited but it is fairly straight forward. I hope you have better luck with the part than I have. Jeff | ||
| Mark Groenda (Mhg9797) New Member Username: Mhg9797 Post Number: 19 Registered: 07-2003 |
Jeff, I am about to do the same. Where did you buy your VSS? Is it an lr genuine part? | ||
| Jeff Conrad (Jwconrad) Member Username: Jwconrad Post Number: 76 Registered: 02-2002 |
yep, bought it from LR-Charlotte (NC) genuine part. | ||
| thom mathie (Muskyman) Senior Member Username: Muskyman Post Number: 339 Registered: 11-2002 |
there was a part number change on the VSS back awhile ago...the new parts are much more sloppy then the originale ones . a friend that is a tech at a nearby dealer said that they have discovered a number of bad VSS right out of the box. they seam to have a miss-sized drive connection. so I would say you did get 2 bad units, you may need to talk to your supplier about it. funny how the new parts cost way more and the quality is much worse? | ||
| Randall Smith (Mr_smith) Member Username: Mr_smith Post Number: 69 Registered: 04-2003 |
You should discuss it with one of the mechanics that work on Discoverys every day there at the dealership. The parts counter guy probably doesn't know anything. I am intriqued by this VSS problem. Im fairly certain that it does not effect RR classics. I am also fairly certain that the CUX type of ECU really doesn't make fueling adjustments based on input from the VSS, the exceptions being if the truck is not moving(idling), or is going to fast(110mph). My guess is that on the D1 there is an inherent flaw in the wiring, the speed sensor, or it's connection to the transfer case. And that when this flaw manifests itself, the ECU's thinks that the truck is exceding the 110mph limit, and starts cutting off the fuel supply to restrict the vehicle speed. This is my guess as to why you get missfires. It is based on my understanding of the EFI system, and not based on hands on experience replacing the sensor and diagnosing those wires etc. Randall |
