Rev counter stuck at 1000?

[langtoftnick]

Hi guys and gals
Diesel 2.5 1995... manual... rev counter is zero when engine off, then goes up to 1000 and stays there whatever the revs, and may go back to zero I’d revved hard

Any ideas where to start looking for the fault?

Thanks for any help you can offer?

Thanks
Nick

[g8dhe]

The Rev counter is actually driven from the ECU with the input from the Pulse Generator, either could be at fault. I would see if cleaning the sensor would help to start with. If you have the equipment then check to see if the sensor is generating the right pulse output before suspecting the ECU.
The link here to the diagrams shows the position of the Pulse Generator sensor 20-H10 http://www.lushprojects.com/bongopartsm ... o=.html#16

[Northern Bongolow]

As an add on to Geoff's comments. It's at the front offside of the engine block, held in with a little bolt. Undo bolt and gently pull, it's got an O ring round so don't loose it when you pull it out, clean out the socket and the sensor and return. Check the wire and connections.
Check the alternator belts and wiring too, it could be the start of it failing.

[langtoftnick]

Thanks (2 of you!) for the helpful comments!

(I'll get a hammer and smash the sensor, then use a screwdriver to slice up the belts on the alternator.)

there aren't enough weekends to keep up with all the things that go wrong!

Nick