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TACHO PULSING ?
Posted: Sun Mar 20, 2005 2:27 pm
by bilby
jumped in the GQ today and the tacho was bouncing between 600 and 800 RPM like it was pulsing ????
it only happens on idle and if u put a bit of throttle into it it sit steady again
got me stumped whats going on
any ideas ????
TB42 engine
Posted: Sun Mar 20, 2005 2:28 pm
by mickyd555
Posted: Sun Mar 20, 2005 2:32 pm
by bilby
yeah pulsating on idle it normally sits steady on 600
it was like like a current spike going thru it
Posted: Sun Mar 20, 2005 3:09 pm
by mickyd555
ok, no more smart arse.........are the revs actually fluctuating, or is it just the taco reading that changes?
Posted: Sun Mar 20, 2005 8:59 pm
by bilby
mickyd555 wrote:ok, no more smart arse.........are the revs actually fluctuating, or is it just the taco reading that changes?
revs dont change only the tacho readout is spiking
sorry just read what i wrote oops
Posted: Sun Mar 20, 2005 10:08 pm
by MQ080
All three of my Nissans have been like that, I don't know why either. Mystery
Posted: Sun Mar 20, 2005 10:44 pm
by TUFFRANGIE
Check the vacuum advance on the dizzy i think that is what was making mine do it
Posted: Mon Mar 21, 2005 3:21 pm
by bazzle
Or if points check bearing in dissy.
Bazzle
Posted: Tue Mar 22, 2005 1:28 am
by bilby
bazzle wrote:Or if points check bearing in dissy.
Bazzle
nope pirana elec. ignition
some one said the regulator on the alternator might be on its way out ???
tacho problem. just go by the hard revs to change gears
Posted: Tue Mar 22, 2005 7:39 pm
by dmar62
Well im not sure where the pick up is for the tacho.. will look it up tomorrow at work... if it is in the alternator, which more than likly it is have the starpoint checked for back connections on the rectifier plate... i have seen faulty diodes do this in alternators...
no worries and good luck...
marto
