Question about 1988 Nissan 300ZX

4 Answers

1988 300zx 2+2 rough running, alot of exhaust smoke

Hi i have a '88 300zx 2+2 , i just bought this car off of an old lady and nothing has been done to it except regular maintenence so i bought all the tune-up parts and a timing belt and tensioner. My friend is helping me out because i dont know nearly as much as he does but on the other hand he has not had much experience with 300zx 's. Back to the problem we put everything in ... ngk spark plugs , ngk wires , distributer cap + rotor , fuel filter , pcv valve , air filter , and then the timing belt and tensioner with the spring , also put a valve cover gasket set on because they were leaking on the left and also got a plenum gasket because we had to take it off to get to the valve cover gaskets. After the timing belt was on and everything was lined up we started it and it ran really rough and there was alot of smoke coming out of the exhaust when we stepped on the gas pedal. figured we would take it around the block to see what happens. Did that and it was smoking unbeleivably and all of a sudden there was a semi-loud knocking noise so we brang it back in the shop to take another look but cant seem to figure anything out. I left the car with my friend and he said he worked on it during the week and he replaced a couple of fuel injection wires and it runs a little better but not nearly were it should. he seems to think its some type of fuel problem were its getting too much fuel but he still cant find the problem. i have searched for recalls online and found that there was a fuel injector recall but am not sure if the lady ever had it done. this is my first time here i just happen to google you guys and am praying that you have some suggestion or maybe even a solution.

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  • T1MAC May 24, 2008

    hi thanks for responding so quickly and to answer your question yes the car was runiing before tune-up and any other work done. we did check the mechanical timing and that was ok. its not black smoke i would say grey.

  • T1MAC May 25, 2008

    hi IrishDruid, i did not get to try those tests that you told me yet on the 300zx 1988 yet but when i was reading your solution i noticed you said to check the spark plugs to see if they were really black and i forgot to mention that i pulled them out to see if maybe one of them were bent and they were fine but i did notice they were really black so does that mean the injectors are bad without even trying any of the tests that you mentioned? and if this is so, i know there is a recall but not sure if they were ever replaced on this car. I GREATLY appreciate your help.

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Hi, was the car running before you started to tune it? Is it black smoke, or oil smoke? Sounds alot like the cam timing may have been affected when you changed the timing belt. Are you able to check the mechanical timing to see that it has not been moved.

robotek

Posted on May 24, 2008

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Check the fuel pressure regulator, it could be defective. Remove the vacuum line from it and check the fuel pressure both with it on and off. If the pressure changed then you have a stuck fuel injector and I would pull each plug until you find one or more that is really black and that one or those will be the ones with the injectors that need to be replaced.

Also, follow the fuel lines to the intake and look for the return line. That is the one that does not have a fuel filter on it. The one with a fuel filter is the pressure line that goes to the engine. Now, look for the fuel rail that the fuel lines connect to. On one end there will be a diaphram with a vacuum line on it and that is the pressure regulator. Check the fuel pressure with and without the vacuum line on. There should be about a 8 pound increase with the line off. If there is no change or it is out of range replace the regulator.

hope that helps!

Posted on May 24, 2008

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  • Swilin Sampson
    Swilin Sampson May 24, 2008

    Also check the coolant hosing for any leaks..

  • Swilin Sampson
    Swilin Sampson May 25, 2008

    Yes, that is a definitive indicator of faulty injectors. Before trying to replace them though, check about the recall first. If they are not replacing it, then go ahead and try replacing them yourself.

    That is most likely the root of your problem. However, do try the other tests as well, to root out any and all problems :)


  • Swilin Sampson
    Swilin Sampson May 25, 2008

    Please note that the blackened injectors could ultimately be caused by the fuel pressure regulator, so please check that as well..

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First of all buy the haynes manual with all parts and diagrams

Posted on May 24, 2008

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For one thing...working on this sort of vehicle with just personal know how, is chancy. Sounds to me like the fuel injection system was totally out of synch, hence the smoking, knocking, etc. So, let's begin with a few issues.

Get a service manual on this, like Chilton's etc, study it thoroughly, then find a buddy with direct experience. These 300zx cars are finicky at best(they are called the Japanese Jaguars, due to their tempermental attitude).

And, then, maybe, you'll wind up with a serviceable vehicle.

Patrick

Posted on May 24, 2008

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SOURCE: 1988 300zx 2+2 rough running and smoke

About the recall: Your Nissan dealership service dept should be able to look up your VIN# to see if the recall was done on your car. Mine did and it was. You don't even have to bring in the car. It might be just a phone call.

AlwaysRight

Posted on Aug 15, 2008

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About the recall: Your Nissan dealership service dept should be able to look up your VIN# to see if the recall was done on your car. Mine did and it was. You don't even have to bring in the car. It might be just a phone call.

AlwaysRight

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