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idle problem


ToxicDepression

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when its cold than it will idle at around 1200 rpms, but when it warms up to operating temperature, it will "buggle" and almost die down to 200 and jump to about 2000 then slowly go back down to 200. BUT... whenever I step on the clutch then the idle will even out at 2100 rpms and be steady. W......T.......F....?????????? doesn't make any sense. yeah i would understand if it was in gear but its always in neutral. (yes it does happen in gear as well) any ideas

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1984 Nissan 720 4X4 manual transmission with Hitachi carb, Z24 engine 

Is it slowly bogging out, or is it like turning off? If its bogging I would replace the jets and check the float. If it is turning off, I could do a cap and rotor replacement...if that doesn't work, I would change lead wires and plugs......and if that fails again, pray.

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  • 2 weeks later...

Is it slowly bogging out, or is it like turning off? If its bogging I would replace the jets and check the float. If it is turning off, I could do a cap and rotor replacement...if that doesn't work, I would change lead wires and plugs......and if that fails again, pray.

no its jumping from 1200 rpms to about 2200 rpms when its warmed up, BUT when I put the Clutch in, It will steady out... Im just trying to figure out why my clutch has a role in changing the rpms while in neutral. 

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  • 2 weeks later...

no its jumping from 1200 rpms to about 2200 rpms when its warmed up, BUT when I put the Clutch in, It will steady out... Im just trying to figure out why my clutch has a role in changing the rpms while in neutral. 

Check your clutch fluid resivoir, it can be low. I was having the same problem and it turned out to be my hydrolic cable and slave.

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