Question about Nissan 300ZX

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My 300zx 1990 non turbo as a problem when i keep the gas peadle stady, the rpm is not stady and it feel like the motor is runing on 5 cylinder, i have change thy air mass sensor and the t.p.s and the spar-plug and check the coil, still the same problem can some body help me on this problem or online right now

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  • lajwanti Jan 03, 2009

    I may Have the same problem, when I stop, and the car is idling..the rpm's are going up and down.up and down. I have to keep the fuel lines tightned, and I smell fuel very strong when this is going on...I am sick of this, I have put all new lines on and still have the problem. I am divorced and cant afford to go to the dealership for service, and dont know anyone who has knowledge of my kind of car..Pleassssssssseee help.


  • erinkirkhuff Feb 24, 2009

    I have the same exact problems they mentioned. I had a bad fuel injector and ended up replacing all of them, since then my 91 300 non turbo has been doing the same thing. I went back though and checked my work, no leaks, changed the fuel filter and ran some injector cleaner through the gas tank, no change. then i changed out the Idle air control valve, and still have had no luck. But I will get back out there and check the coils. we had to take them out when we changed the injectors so it is possible one of them got messed up. Thanks



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GUYS i HAVE HE SAME PROBLEM, when the motor warms up after about 15 minuts of driving the check engine comes on and off and the acceleration and smell of gas appears the problem disapears after you get above 3000 rpm then he engine light goes off and normal acceleration returns until you go below 3000 rpm or stop at a light. any help would be appreciated.

Posted on Oct 13, 2008

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Let's start this with the assumption that you have a problem with one of your cylinders and its firing. With the engine idling, disconnect each coil pack, one at a time, and watch for any change in the way the engine runs (plug each one back in before you unplug the next). If it gets worse when a coil is unplugged, then that cylinder was running fine and isn't the problem. If you unplug one, and there's no change in the way the engine runs, you've found the problem cylinder. Try that out and post the results and we'll go from there.

Did you verify that the new spark plugs are gapped correctly? They don't always come pre-gapped and may need to have the gap set before installation. Also, do you have black smoke coming out the tailpipes? If so, that is an indication that the car is running rich, which would likely be the oxygen sensor on whichever side you see smoke from.

Posted on Jul 30, 2008


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