I have a 1978 280Z, lately i have noticed that when i am coming to a stop the engine hovers at about 2000rpms for a few seconds then drops down to normal idle. Also when i get the tachometer above around 3200rpms it begins to just bounce around everywhere, but the engine is not affected at all. If i keep it under 3200 the tach works just like it normally would, i would appreciate any help in this matter.

Thanks
NiSMOGuy

 

The Z tacho's that came on cars after the 240z ie :260z or up had problems not sure about ZX ones.
I had a 260z and all the tacho's I tried were faulty wiring was correct and all.

Gavin,
Melbourne
Australia
73' Datsun 240z

 

Sorry to conclude my advice I'd recommend getting another Tacho an aftermarket one such as Autometer. As the old Z ones arn't exactly accurate.

And the 2000rpm idle might be a sticky accelerator. Try liftting your gas pedal with your foot towards you and see if that stops it idling high. Don't know if 280z had cable or linkages for the accelerator but my 240z used to do it.


Gavin,
Melbourne
Australia
73' Datsun 240z

 

On 280'z, at this age, they almost all need a bit of work on the linkage if it hasn't been done already. A lot of places for stickiness to strike. A favorite spot is make sure the pin is retaining the linkage rod coming from the firewall pivot where it joins the next linkage rod near about #5 cyliner or so. Sometimes they go AWOL there...
The little ball joints up at the throttle body will stick, too. Some silicone or teflon lube there helps (TriFlow is what I've been using lately...). My sympathies on the tach. My latest project car needs a new one, too. And a dash. And some new wheels and tires. And paint. And carpet...

 

I've got a stock 280Z tach that works that I don't want. Any takers?

I plan on putting in an aftermarket one.

-Steve
http://hometown.aol.com/stev240z

 

yea if it work ill take it. email me at nismoguy280@hotmail.com

 

mine bounces a bit around 5000... but its accurate enough to read... wouldn't mind a aftermarket one thou..

<font color=blue>76 260z</font color=blue>
The NiteRider

 

you ever get a tach i have 4 for sale Mark

 

my 78 260Z 2+2 tach is just fine acurate the whole range and doesnt bounce.... i also have 2 x 240Z ones that dont move but neither do the cars at the moment

 

I have an 82ZX.

The tach is fine, but I have had some sticky throttle linkage
problems which were solved with some dry lube. If you jiggle the linkage and the revs drop, that is likely to be your problem.

iksteh

What Rust?