the AIV valve is dirty. This is a very common problem, your best bet is to remove the entire AIV box (located behind the airbox on the drivers side) via the 3 screws holding it in place, then remove and plug the 2 hoses that were leading to it. This is completely safe, and all it is doing is keeping exhaust fumes from entering your intake manifold. If this doesnt work, then try installing a new fuel filter, preferably one for a 1990 300ZX, it is a direct fit and will give you a better throttle response
You can't it is not adjustable, It is controlled by the computor. You have something wrong, Vacuum leak, Dirty Idle air control valve You need to scan engine with a engine scanner to see if something is wrong with the emission system. Is the check engine light on ?? SCAN ENGINE. There is a number of things that could make it idle to fast.
There is no idle adjustment. It is controled by the computer. You need to look for a vacuum leak, And may need to clean the idle air controll that screews into the left rear side of the TBI. throttle body. Is the check engine light on ?? If so need to scan engine with a engine scanner to see what is wrong with the eminssion system.
If you have an FSM, the procedure is spelled out fully in there. If you don't have an FSM, here's how to do it: Fully warm up the engine. Shut engine off. Disconnect the TPS harness connector. It's located on the passenger's side of the engine just above the throttle assembly. Attach timing light. Start engine and set timing to 20 degrees BTDC. Check the idle speed. It should read 650 RPM; If not, adjust the idle screw until you get 650 RPM. The idle screw is located on the passenger's side of the engine near the firewall below the intake manifold. Stop the engine. Reconnect the TPS harness connector. Start engine. The idle speed should now be 700 RPM
That is a plug that has been put in there from the factory to keep you from fooling with the idle screw. THE IDLE SPEED IS COMPUTER CONTROLLED AND NOT ADJUSTABLE. YOU HAVE other PROBLEMS if it won't adle right. Is the check engine light on ?? If it is then you need to have the engine scanned with a engine scanner to find out what is wrong.
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