Erratic Idle

[BOSS777]

Hey folks,
could use some help. My 92 300ZX non turbo has a problem with the idle. Very erratic going from 500- 1100 RPM'S. Car only has 41,000 miles. Any help is much appreciated.

[GerryO]

http://home.swipnet.se/e-solutions/IdleTech.html

http://home.swipnet.se/e-solutions/IdleTech2.html

[BOSS777]

Thanks for the link, I will check It out. Hopefully I can get it resolved when I get the time. I will let you know how I make out. Thanks again for the info.

[marty1mc]

A side question for you, has the timing belt been replaced???

[BOSS777]

No, but the injectors were changed about a year ago. The throttle positioning sensor was moved a bit due to a loose screw. When I adjust (not with the meter yet) along with the idle screw, I can get it to idle fine. After it has run a while though it starts doing the same thing.

[marty1mc]

Well, the timing belt isn't the issue with idle. But, the timing belt is 19 yrs old. You seriously need to consider replacing it and doing a 120k kit, Ramey studs for the idler pulleys. If that thing breaks, your idle will not be your issue. Nissan spec is 60k miles OR 48 months...

[GerryO]

Replace the water pump along with the timing belt. PCV valves and clean the EGR tubes too.

[NolimitZ32]

Check for vacuum leaks.