Question about 1990 Nissan 300ZX

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1990 nissan 300zx N/T, when idiling, rpm's go up and down

The rpm's go up, down, up down when idling (as I stop at redlite.ect) I can let out on the clutch a little and it stops. It uses twice as much gas when it acts up. and when I start smelling fuel, I have to retighten the fuel lines...all the fuel lines have been replaced 2 times and still acting crazy, Please help

Carole

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Is your check engine light on? Mass Airflow Sensor would cause this and make your light come on. Check this website it may give you some more insight to what could be wrong ... click on the tech section and there is two sections for erratic idling ......

http://www.z-car.net/

Hope this is helpfull, but I would hook a scanner on it and make sure there aren't any codes also check the vacuume lines.

Posted on Jan 04, 2009

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Monitor the starting problem.

If you're starting OK until BELOW 1/3 of the tank then it's a weak/failing fuel pump + filter filter.

A fuel pump will perform poorly when it's low on fuel.

An old fuel filter will reduce the fuel pressure and cause the fuel pump to work harder.


Also check the gas cap for deteriorating plastic seal.


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