bigrick147 Posted February 11, 2014 Share Posted February 11, 2014 Hello, I just recently got my 1979 280zx back. The engine is completely rebuilt and 90% new parts. However I am having some issues here. For one the engine itself lacks a bit of power, and has a bit of a misfire at idle and upon acceleration. It has new fuel system, new injectors pump spark plugs/wires. Ect ect. I am just curious if it could be the timing on the engine? Or what and if so I am curious as to how I'd go about setting it if anyone knows the correct degree. Another question is i took it through emissions last week and it passed under load with my readings of hydrocarbons: 89. Carbon monoxide:.14. And at idle my readings were hydrocarbons: 442 and Carbon monoxide:.11 it failed for hydrocarbons. .......any ideas as to what caused that? Quote Link to comment Share on other sites More sharing options...
ttodhunter Posted February 11, 2014 Share Posted February 11, 2014 Maybe the timing is way retarded so at idle it doesn't have time to burn the fuel completely, but as the advance kicks in... Quote Link to comment Share on other sites More sharing options...
AkRev Posted February 12, 2014 Share Posted February 12, 2014 (edited) With high HC you can retard the timing to bring it down. If you go to this website, they have a nice chart of how timing affected an engine for emissions (3/4 the way done the page) http://msextra.com/doc/ms2extra/MS2-Extra_Tuning_Manual.html Good luck Edited February 12, 2014 by AkRev Quote Link to comment Share on other sites More sharing options...
HowlerMonkey Posted February 12, 2014 Share Posted February 12, 2014 The misfire is the reason for high HC. If it is a consistent misfire every time around, check your plugs and determine which one is wet? If you find a wet plug, check the valve clearance on that cylinder. Run your engine at night and look for sparks from the wires. Quote Link to comment Share on other sites More sharing options...
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