Question about 1998 Nissan 200SX

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Idle too high +goes higher when put in gear (manual transmision

When i start my car idle goes up too 1500 rpm then drops too 1200 rpm and stay but i put it in gear any gear idle goes up at 1500 new maf., tps. sprk.plgs.air+gas filters

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  • Anonymous Mar 27, 2014

    what is the correct idle for a 2004 Lincoln

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  • Nissan Master
  • 705 Answers

IAC valve problem. Nissan has a updated harness (with one way diode inside of the harness) to prevent backfeeding for the IAC valve and a new IAC valve also gets installed. That's where I would look. IAC valve or "idle air control" valve.

Posted on Sep 21, 2008

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1997 acura cl 2.2 revs up to 1500 rpm and down to 1000 rpm just several seconds after start


Cars are design to run at a higher idle at start up to warm them up quick. There is a sensor that reads water temperature and tells your car's computer how fast to idle. Your RPMs seem slightly high but not out of the norm. Does idle ever drop to around 600/800 after about a minute? If not, your engine temperature sensor maybe defective.

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Rpm does not drop below 1000


No,only on carburated engines it,idles down to the set point,on yours,it's fuel injected,pushing gas pedal won't kick idle down,should go down after a certain amount of time,does it automatically,If you start and drive a 5 mile ride and stop at a stop sign,it should idle at it's set point if there's no engine problems,which may be.5 to .7 on your tac.When you normally first start,it will idle between 1000 to 1200 rpm's,don't push on gas,let idle say 15 seconds,put in drive and go.

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Start car and the idle goes to 3000 rpm, holds there for around 12 seconds or so and then comes down to around 1200. when driving if stopped and you put the car in park or nuetral the idle will go up to...


it sounds like a vacuum leak to me, my car had the same problem but when i changed the hose that connected the valve cover to the fuel injectors the rpms dropped back down to about 800 rpms

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RPM run high and slow to drop down


There could be two problems i can think of here. First would be a computer problem. The computer might be telling the car to run at a high speed. A problem like this might be fixable from your local garage. A problem like this could be expensive. Second, as engines age, they natually tend to idle higher. This is a normal occurance. This is accompanied by a decrease of gas mileage. For me, i went from normal 26mpg down to around 22mpg. A problem like this can be fixed by using fuel additives aimed at high mileage cars. I have used fuel injector cleaners, and that has brought my car back to her glorydays of 1996. I hope this helps, if not let me know.

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the rpm will drop after is starts worming up a bit and it will build pressure be for it drops.

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sounds like the tps is bad or idle control motor

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did you check for vacuum leaks? vacuum leak will cause a higher rpm , and some use vacuum to shift transmission,

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