Misfire Vehicle Speed Sensor Disco 1

[rovering]

LOL, Monday, morning, I took my son to the train station and on the wayhome, my '88RRC quit! Knowing I've got a wonky fuel gauge, I dumped the five gallons I carry into the tank and drove on.

It happened again! And seemed to be worse when I hit the rumble strips on the edge of the road.

I got it home and thought I'd found the problem as the coil wire was rubbing on the alternator pulley/fan.

Ran to NAPA and clearly, that wasn't the problem. Before leaving NAPA, I crawled benath the truck and disconnected the speed transducer (VSS on early trucks). Voila! No misfires!

I was pretty surprised as this was the first time I'd seen one that was wonky at pretty much all speeds. I was preparing to look at vacuum advance, plugs, wires, ignition amp, etc and merely unplugging the transducer seemed to have resolved the issue.

The first stop sign I came to the engine died as it wasn't sure what to do wit the IAC, I'm sure, but once it figured that out, it hasn't been an issue, but I do plan to replace the trasnducer this afternoon.

FWIW-I have a brandy new VSS for a DI, genuine Land Rover in the box.

What a splendid bit of good fortune on that one! :applause:

I must admit PTSchram, I'm starting to think more and more that I might just be better off buying a new transducer. I mean, the one that's on the truck is the original AMR1253. I'm sure it's the original unit. It appears the part number has changed to YBE100540 now. This might be one of those items that I need to do for sake of doing it before it completely fails (as I'm sure it eventually would).

What's that you say? You've a new transducer in the Rover box? Is it the YBE100540 or a new older stock AMR1253? What might you need to get for this?

 

[mkerr2112]

So, I understand this is an old post, but did you ever trackdown this problem? I'm having similar issues and would like to know. :banghead:

Exact same problem. New VSS installed still runs like crap (Misfire excessive emissions, multiple cylinder misfires). VSS unplugged runs great, except for the stall at deceleration.