Re: I have a high idle on my Nissan 300ZX what could...
I have a Nissan 300zx twin turbo 1990.... The engine and car are in very good condition ... well serviced... The idle speed will not go below 2000 rpm can you help as there is no manual adjustment...????
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The throttle position sensor may be causing your issue----This sensor monitors the outside air temp.In the winter the throttle opens up far because th.e air temp is cold and vice versus
High idle in most cases is caused by a vacuum leak. Inspect the vacuum hoses and check the intake manifold gaskets as well as the throttle body boot for cracks or tares or loos connections on all areas previously mentioned. The idle is not adjustable and is factory set.
yes, thats the typical symptom of a IAC valve giving you trouble, try cleaning it up but ull probabbly will have to replace it have fun hope this helps
the idle on the 300zx is supposed to be around 750-900 with the na being on the high end and turbo on the low end. sometimes when you clutch the revs drop and the engine does not recover enough. raising the idle to around 850 will help dramatically. also it would be a good idea to check for vacuum leaks as a severe enough one could also cause it to stall. another thing to look at would be if you clutch is fully disengaging. once slowing to a stop if the clutch is still catchin a little the car will stall. if you have a turbo car the clutch is vacuum assisted and the booster has been known to go out from time to time. i would investigate the vacuum and clutch booster
An idle switch regulator also known as a idle air control valve a code 23 for a Nissan 1986 300zx is located on the intake in the center on the passenger side of the Z it has 1 wiring harness and two hose placements one on the front and one on the back difficulty taking this off little if any.
If the car idle on high rpm check if when you will step on the gas pedal over 2500 3000 rpm the car will start shaking and the will die if thats happening then check your mass air flo sensor ,or if there is no air leak that avoid the mass air flo sensor
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