Question about 1990 Nissan 300ZX

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Nissan 300zx starts smoking when reaches tempture

My nissan 300zx as a regone engine and turbos runs fine just smokes when warm.

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  • binabee3 Feb 20, 2009

    the engine has totally been rebuilt and recon turbos new exhaust doing away with cats stiil got lams behide turbos has bost value fitted no missing runs sweet but when the engine reaches tempture starts smoking vapour and oil loads but goes quickly only does it when engine is ticking over

  • dustin allen May 11, 2010

    i need to know more about the problem

  • Bill Hackett Jul 25, 2014

    Odds are that you have a problem with the cylinderthead temperature sensor or poor connections to it. When the engine is cold it needs the extra fuel to run and the iniector pulse width will be wider which will result in the car seeming to run well when it is cold. As the engine warms up to normal temperature, it doesn't need all that fuel so the ECM will shorten the pulse width of the injectors causing it to lean out. Your description of the sympyom is classic of this problem and of the need in checking for this problem which will probably resolve the complaint. The sensor is located (if you are faceing the engine( look at point where you put the coolant into the engine. Follow it down to the right, torwarrs the lower part of the left front cylinder head. You will see a yellow sensor with a connector pluggrd into it. Corrosion in the plug connectors and/or pins coming off of the temp sensors will give anywhere from no reading to bad readings (resistance values the computer needs to have to make it's mixture change as the temperature changes) These resistance values can be checked where the plugs connect into the computer if you have a "pin out" chart which identifies which position the pins are located in on the plug. You will need an ohm meter, a scale showing the resistance values VS the temp. You can get all if this information off of the Internet. If this doesn't resolve your problem, write back and I'll give you a few other areas to check, but I can't see making things complicated by giving a zillion "could be's" when your description "if accurate" is as classic as it is. Good luck



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  • Contributor
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Trust me its one of the turbos if you take it out for a spin get the turbos working there will be no smoke leave it ticking over for 2-3 mins and the smoke will start if this is the case it is one of the turbos i had it with a new pair

Posted on Feb 27, 2009

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  • Nissan Master
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To check to see if the turbos are the source of the problem, pull thehosess loose for the turbos from thr intske side. Feel arround the turbo outlet for oil, if it,s wet with oil it's a turbo seal. Also put your finger on the center of the rotating part and try to make it move up and down or side to side. if you find any, the bearings in the turbo are shot. In theory it should smoke even when it's cold unless the seal is just starting to fail. The heat causing the metal to expand will be enough to create a gap for a leak which which will cause it to smoke from the oil pressure going to the bearings in the turbo.
Typically an air mass sensor Air flow mwter), if it's bad, will cause a hard start if it will start at all. if it starts, typically it will pop and back fire through the intake any time you try to apply the throttle.I've worked on hundreds of 300Z's and never run accrross one yet which caused that condition, It doesn't mean it's not possible, It's just that I haven't run into one yet..You could have a cylinder head temperature sensor that isn't plugged in solid.or it's bad, telling the computer that the engine is cold which will make it run very rich which would cause ir to smoke, but run strong once it's moving because it would be like having over sized injectors, but you haven't had your computer remaped to propery manage the oversized injectords (Jim Wolf out of California remapes computers and I think the injectors from a 5.0mustsng will fit te Z depedinf on the configuration of the injector. I think the Mustang injectors deliver 550cc which I beleive is more than your turbo delivers. I have more suggestions, like if they tampered with the throttle switch it will show up more when it's hot.I'm leaning torwards the tempersture sensor. Either unplugged, bsd connections, or the sensor it self. I have more ideas, but have run out of time. You canstart looking in the areas as I have described and maybe one of them will resolve your problem. let me know. My son my best friend and I have a roaad raceing team which we race 300Z's
I worked for Nissad back when it was Datdun, starting in 1968

Posted on Jul 03, 2014

  • Bill Hackett Jul 03, 2014

    OOPS on the Nissan and Datsun. I have Parkinsons disease which makes it hard to always catch errors But beleive me, I know my nissans and Datsuns



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