Question about 1990 Nissan 300ZX
My nissan 300zx as a regone engine and turbos runs fine just smokes when warm.
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
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
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