260Z Tacho - Intermittent Sticking Problem

[crowe]

Hi all,

 

I have read a few posts on the issue and it seems potentially related to electonic ignition and a need for a resistor in the signal feed to the tacho. My tacho seems to work fine but does not go above 4500-5000rpm, it just stops and sometimes is will get stuck there for a while before it starts to work again. I have also seen it stick at lower rpms ocassionally.

 

I have Petronix electronic ignition and 1.5ohm Petronix coil and still using a ballast resistor at the moment. Is the issue that stops the tachos working accurately the signal feed to the tacho being too great? I thought with the ballast resistor that the feed is reduced? Can someone clarify?

 

I would like to keep the same tacho if possible and fix the issue, is this 7500-10000 ohm resister that other posts discuss installed in line to the tacho feed the answer? Has someone done this and cured their problem?

 

The coil, electronic ignition and ballast resistor are all new.

 

Thanks, Callum

[2+2er]

I have seen mine do this too but have yet investigated it. It Does happen more often on hot days.

[Lynton]

I thought it was imperative to remove the ballist resistor from the coil so the electronic charge is correct? Lynton

[Zedman240®]

Depends on the coil if you run a ballast resistor or not. Usually electronic ignition coils run on straight 12V and don't need the voltage to be dropped. Points type coils run on 9 volt and only use 12V during start up.