Question about Nissan 300ZX
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Posted on Jan 02, 2017
SOURCE: High idle
Has it always been this way as it sounds like it warms up and then runs at idle at an ideal rpm which is quite common for many cars although I haven't specifically seen this car run before. Are both idles higher than normal for your car? If so, I can suggest what you can do but if it runs fine otherwise, I don't think there is anything really wrong with it.
Posted on Jul 21, 2008
SOURCE: high idle and engine getting hot
most common thing for this is either a failed coolant temp sensor that is not telling the computer that the car is warmed up and it is still running at cold Idle speed adn the code will tell you that.
Or a vacuum leak and the computer is trying to make up for the leak my making changes to the fuel deliery to keep the engine running .
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The only way to find out what code is stored in the computer and what turned the check engine light on is with an OBDII scan tool and also the only way to turn off the light but just turning off gthe light does not fix the problem, as soon as the computer does it checks again and you have completed the predetermined dive cycles the light will return so the only way to keep the light off is to properly repair the reason it was commanded on in the first place!
Posted on Aug 23, 2008
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
there is either a vacuum leak,or a valve on the throttle body called an iac that is bad. it is the idle air controller.alot of mazda have that problem
Posted on Oct 23, 2009
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