In conjunction with a no start/surging/engine runaway/no response to throttle pedal situation my tach/speedo run wildly or don't work. I also got code 16 (VSS buffer fault). Any ideas about that?
Brian

Have you cleaned all your grounds?

Maybe not all but many. I cleaned all the ones that attach to the engine and the battery terminals but I did not clean the firewall ground and I'm sure I missed some other ones. This wierdness occurred after remote mounting the FSD. I was having dying issues and a code 35. While remote mounting I tightened the resistor nuts on the back of the FSD. At first startup it ran great for 20 miles then started with this. Do the VSS buffers go bad? I think that is near the ecu.

My tach went wacky about 6 months before my alternator took a crap. Put a new one in and it worked perfect............

X2

Louis

My tach went wacky about 6 months before my alternator took a crap. Put a new one in and it worked perfect............
Was it associated with no start/stalling/surging?

No, That sounds like Grounds or pump.......let's say grounds to start with......Clean them, I learned the hard way.
I'm no expert though..........someone will chime in.

Louis

Does your gearbox shift properly?

I cleaned the ground on the passenger side frame rail and the truck fired right up. Throttle pedal would not work. I unplugged the VSS buffer and the throttle worked. Plug it back in and it doesn't work. I was able to drive it up the driveway. I'm going to try to track down a VSS buffer.

Was it associated with no start/stalling/surging?

Not really. I have had to replace the PMD a time or two but what fixed the tach issue was replacing the alternator, no question. I had already checked all grounds, etc..........

My tach went wacky about 6 months before my alternator took a crap. Put a new one in and it worked perfect............

It just happened to me. The tach went out for about 6 months. Finally, it won't start. Put in a new Alternator, it is fixed.

I went to the JY yesterday and got a VSS buffer from a Gas 4x4 2/3 ton Burb. Plugged it in and the truck drove perfectly 40 miles to work this morning towing an empty car trailer. I am a Christian and I thank God for this.

I went to the JY yesterday and got a VSS buffer from a Gas 4x4 2/3 ton Burb. Plugged it in and the truck drove perfectly 40 miles to work this morning towing an empty car trailer. I am a Christian and I thank God for this.


I didn't know he worked on Diesels. ;)