My Z sometimes coughs and shoots out smoke through the exhaust. This only happens once and awhile. Just had all vacumm leaks repaired, tune up, fuel pump and filter.
What could be causing this?

 

If it's white smoke it can be your turbo (if yuo have one)
If it's black smoke it's only gasoline. That isn't dangerous!
But the white smoke means that your turbo have seen it's best days!

Black horror

 

when does it smoke? after startup? after starting it after short drives? first thing in the morning? that's common.

otherwise, white smoke means water in the exhaust. Like kaide said, turbo seals or even head gasket.

http://zbum.nissanpower.com

 

Its a non turbo and only does occasionally after its been running a long time. Then when I re- start it, it runs fine. Could it be the fuel line with some moisture? New pump, filter, fuel injection cleaner. No gas smell.

 

Check your ignition parts!
Change spark plugs ext.ext!
It's cheaper than take it to Nissan service!!!


Black horror

 

If it's water in combustion chamber it won't run good at re-start
because there is still water in it!!





Black horror

 

Thanks all for the input. No,its white smoke and only does it every so often. Its almost as when 'you cough" and then goes away. Wierd!1

 

got the same thing going on with me z. The exhaust smells heavily of gasoline. I also have an oil leak I'm guessing with my head gasket, but the white smoke definitely doesn't have a burnt oil smell to it. I'm thinking that I have multiple things wrong with mine though. Something to do with fuel not being all burnt up, oil leaking from head gasket, ect. Anyways, car still runs great! I just ran a thing of slick 50 fuel injector cleaner through it, and replaced the fuel filter and now it accelerates without lack of power whatsoever.

 

The white smoke could be the result of fading piston rings,
the stock rings do okay, for about 100k miles. After that you may experiance some smoke, but if you haven't lost any power I would not worry to much. The time to worry is if there is no power, as this could be the result of no compression/ the bad piston rings. You would notice as well A large amount of bluish/ white smoke(from the oil escaping past the rings into the combustion chamber).