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300zx TT black smoke and bouncing idle 500-1750rpm when warm

Hi, I recently purchased a 300 and I have the current problem with idle and black smoke 


300zx TT black smoke and bouncing idle 500-1750rpm when warm 

when it’s cold it sits at 1500rpm but as soon as it’s warm it just keep bouncing up and down from 500-1750rpm with black smoke 

 

any help or suggestions or anyone who has had this problem before please let me know 

 

thanks 

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    • Tom-B
      Tom-B

      As a quick check, you should be able to unplug the MAF and run it on the base map to rule out if it’s causing the issue. As mentioned above, it’s quite possibly an air leak. The small hoses aroun

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    8 minutes ago, Tom-B said:

    Apologies if you’ve tried this already, but have you tried an ECU reset? You need to do it on the Z32 if you make any modifications.

    By taking the battery off ? Haven’t done it in a while but have tried it a few times since maf replacement 

     

    thanks 

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    I think you need to do more than that, have a look at this link.. further down the page in the section "Clearing Codes"

     

    300ZX ECU diagnostics

    Edited by Tom-B

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