Ryan Lawson
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- Joined
- Aug 3, 2020
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Ok, so my speedometer and odometer are not working. All other gauges work correctly. I'm sure this question has been asked several times, but I cannot find a solution to my problem. Here's what I've done so far.
1. Changed out the worm & drive gear inside instrument cluster. No change.
2. Removed VSS and looked inside. Gears look fine.
3. Hooked VSS up to volt meter and spun with drill. It pulled 9 volts at a fast speed.
4. Pulled speedometer part of cluster from junkyard. Replaced the tiny motor the worm gear installs onto. No change.
5. Purchased new harness that plugs into VSS. No change.
6. Saw on google that the 15A fuse that runs the dome light may affect the speedo (not sure if that's true). Checked it anyway and it's fine.
7. Pulled passenger kick panel where the ECU is and located the pink/orange wire and gray/black wire that go to the VSS. Just wiggled them, kind of scared to mess too much in there. No change.
After all that, the only thing I can think of is the small control board for the speedometer inside the cluster may be bad. I have one from the junkyard but I really don't want to change that because the needle has to come off. On my last mustang I changed the overlays and the needles never were right again.
So, my questions are:
1. (obviously) Am I missing anything?
2. Can someone give me more detail on where the wires run from VSS to kick panel? I saw a post on ford460 forum where someone replaced the wires completely, but the guy was extremely vague.
3. Should I go ahead and replace the VSS just to see?
4. If I have to replace the control board, can someone give me detailed instructions on how to do it without screwing my needle movement?
My car is a 1994 cobra. 302 bored .030 over with DSS forged pistons. Trick Flow kit w/ cam. BBK shorty headers & cold air intake. 3.73 rear end gears.
Sorry for the long post, and thanks for any help.
1. Changed out the worm & drive gear inside instrument cluster. No change.
2. Removed VSS and looked inside. Gears look fine.
3. Hooked VSS up to volt meter and spun with drill. It pulled 9 volts at a fast speed.
4. Pulled speedometer part of cluster from junkyard. Replaced the tiny motor the worm gear installs onto. No change.
5. Purchased new harness that plugs into VSS. No change.
6. Saw on google that the 15A fuse that runs the dome light may affect the speedo (not sure if that's true). Checked it anyway and it's fine.
7. Pulled passenger kick panel where the ECU is and located the pink/orange wire and gray/black wire that go to the VSS. Just wiggled them, kind of scared to mess too much in there. No change.
After all that, the only thing I can think of is the small control board for the speedometer inside the cluster may be bad. I have one from the junkyard but I really don't want to change that because the needle has to come off. On my last mustang I changed the overlays and the needles never were right again.
So, my questions are:
1. (obviously) Am I missing anything?
2. Can someone give me more detail on where the wires run from VSS to kick panel? I saw a post on ford460 forum where someone replaced the wires completely, but the guy was extremely vague.
3. Should I go ahead and replace the VSS just to see?
4. If I have to replace the control board, can someone give me detailed instructions on how to do it without screwing my needle movement?
My car is a 1994 cobra. 302 bored .030 over with DSS forged pistons. Trick Flow kit w/ cam. BBK shorty headers & cold air intake. 3.73 rear end gears.
Sorry for the long post, and thanks for any help.