Hi All

Posted a couple of years back about a jumpy rev counter in my Saph 4x4 Cossie... before I could try the suggestions it cured itself?

However now it is back with a vengence, and obviously I cant remember what the cure was? Seem to remember it was to earth something like ignition amp, but we have done that with no success (in fact if its possible its worse)?

Any suggestioons very welcome as its doing it all the time now, even at very low revs/speeds?

Thanks in advance

 

Dodgy revcounter or circuit board?

 

I've had 3 Cossies now and they've all done it

There doesn't seem to be a cure for it

 

i hat that problem on saturday revcounter was jumping around
and also it came of the clock then my feking spedocable snapped
so been driveing around with no spedo and gest wat the revcounter
seems to be working again reaving cleanly feking weird or wat

 

Thanks for the replies guys

I am sure someone said it was down to a faulty connection or earth last time, I just cant remember exactly what it was

Back up for the lunch time people...

 

phase sensor

 

TDC &/or phase sensor can cause it, ignition amp can as can a dodgy connection from the coil where the actual rev counter pulse input is picked up from.

 

Ranj,
Can only be possibly this if the car has misfiring issues too.


Kevin B,

Try this....

Next to the coil on the loom is a rev counter filter block.
This is black and about an inch long (bolted on bodywork if escos)
This will have TWO identical cour GREEN wires on in.

Disconnect these wires and temporarily join the wires together.
(only do this if the ignition is OFF otherwise you will get a shock)

See if this sorts things out.

This filter is to prevent radio interference.
One green wire is connected to the coil negative and the other goes to the rev counter.

 

I had that problem on mine, changed the normal coil for a GRP A one and its been perfect ever since.

 

i have got a "lazy" counter seems to be reading approx half of what it should be for every rev

 

Thank you all (again)

In the last few days the bouncyness has been getting worse, ie, its now doing it all the time, including on the over-run? It has also developed a slight mis-fire which is barely noticible (its only noticible at low revs/speed), would this point to the phase sensor? If so what/where is it and what do you have to do to it to sort the problem?

Will have a look at the black block near coil (its a Saph not escy) and see what that does.

Thanks for the replies, if someone (Simon?) could answer the above i would be very appreciative

Thanks.

 

PS - it has got a group a coil on it, and has done for a few years...

 

good thread this one, mine does it some times and now I know what to check

Mat

 

The phase sensor is at the bottom of the dizzy.

The TDC sensor is located on the bottom pulley.

If it has a misfire as well, then it is likely to be one of these.

 

Cheers Mike

Knew where the TDC was, and suspected the phase was under dizzy but was not 100% sure.

What do we have to do to them to check/sort them?

 

Relace them with a know working one and/or recheck the gaps.

 

Or fit a Pectel monitor and this will display any errors .

 

yes that would be cheeper

 

Mike,

Are you saying you have one we can borrow for test purposes??

 

crank position sensor ... i had the same... changed it and it went

 

Kev,
Given that mine is fixed in the car, no . Harvey has one for this purpose though .

 

Cheers Pete - Will have to take a look later.

Mike -

 

How didyou get on m8 ?

 

Usually a Poor Connection on the right hand multplug above the engines cam cover on 4x4s.