Jump to content


Photo

idle problem


  • Please log in to reply
9 replies to this topic

#1 ToxicDepression

ToxicDepression

    Newbie

  • New Members
  • Pip
  • 16 posts
  • Location:Preston
  • Cars:1984 Nissan 720 4X4

Posted 10 January 2017 - 11:03 AM

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



#2 racerx

racerx

    Senior Member

  • Senior Member
  • PipPipPipPipPip
  • 2,534 posts
  • Location:NorCal
  • Cars:71 Datsun 510 and 65 Mustang Fastback

Posted 10 January 2017 - 01:25 PM

kind of vehicle, type of carburetor?



#3 ToxicDepression

ToxicDepression

    Newbie

  • New Members
  • Pip
  • 16 posts
  • Location:Preston
  • Cars:1984 Nissan 720 4X4

Posted 10 January 2017 - 01:29 PM

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



#4 banzai510(hainz)

banzai510(hainz)

    L motor God

  • Senior Member
  • PipPipPipPipPipPipPipPipPipPip
  • 14,595 posts

Posted 10 January 2017 - 02:04 PM

I assume you ck the cable  to make sure not binding and lube it up. Carb binding also?


Throw on some Weber sidedrafts, Rising Sun hood.... call it good

#5 ToxicDepression

ToxicDepression

    Newbie

  • New Members
  • Pip
  • 16 posts
  • Location:Preston
  • Cars:1984 Nissan 720 4X4

Posted 11 January 2017 - 01:21 PM

I assume you ck the cable  to make sure not binding and lube it up. Carb binding also?

what cables are you referring to exactly, Im not too familiar with this carb just yet. 



#6 asid99

asid99

    Newbie

  • New Members
  • Pip
  • 20 posts
  • Location:San Jose, California
  • Cars:1981 Datsun 720, 1970 Datsun 510

Posted 12 January 2017 - 08:15 AM

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.



#7 asid99

asid99

    Newbie

  • New Members
  • Pip
  • 20 posts
  • Location:San Jose, California
  • Cars:1981 Datsun 720, 1970 Datsun 510

Posted 12 January 2017 - 08:17 AM

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

before you try any of those though, check the bottom cover to the steering wheel. It can come loose over time and pull on your ignition wires.



#8 ToxicDepression

ToxicDepression

    Newbie

  • New Members
  • Pip
  • 16 posts
  • Location:Preston
  • Cars:1984 Nissan 720 4X4

Posted 20 January 2017 - 10:01 AM

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. 



#9 datzenmike

datzenmike

    KING RAT

  • User Administrator
  • 65,174 posts
  • Location:Vancouver Island
  • Cars:'74 710 sedan, '76 710. prevoius... '78 620, '71 521, '68 510 new '76 B-210

Posted 20 January 2017 - 03:50 PM

The clutch is part of the emissions system.


Posted Image

#10 asid99

asid99

    Newbie

  • New Members
  • Pip
  • 20 posts
  • Location:San Jose, California
  • Cars:1981 Datsun 720, 1970 Datsun 510

Posted 29 January 2017 - 09:53 PM

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.