Guest G-nose240z Posted January 24, 2004 Share Posted January 24, 2004 Hey all I have a 76' 280z that has started to run really rough and really rich lately. It sounds like it is only running on 5 cyclenders and has a really steady miss through the RPM range. It is also shooting black smoke out the tail pipe. I have checked and replaced a few vacume lines, the AFM, and tried disconnecting the cold start valve but nothing is working. Any ideas? Quote Link to comment Share on other sites More sharing options...
datsunlover Posted January 24, 2004 Share Posted January 24, 2004 I had a 280zx do that to me. Hard to start, spewed black smoke, missed all through the RPM range, ct. I sold it before I could figure it out, but the guy I sold it to found the problem 3 months later: A bad fuel injector. I did the same thing as you, and started replacing stuf, but didn't think of an injector. "doh!" Make sure to check the whole ignition system too, as a bad plug/wire can do similar things. If everything else checks out and is in proper order, I'd bet you have a bad/failing injector. Try taking all of the injectors out and getting them cleaned, or if you have the $$$, just replace them all. Hope this helps! Quote Link to comment Share on other sites More sharing options...
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