TwinTurbo.NET: Nissan 300ZX forum - Problem solved - Hard start and bucking at random RPMs
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Subject Problem solved - Hard start and bucking at random RPMs
     
Posted by TwinTumor on December 26, 2020 at 6:52 PM
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Message I made several posts trying to figure this out, and I want to post this here because maybe it will help someone in the future as it took me almost a month to figure out. My symptoms are:
-Hard start and backfire out exhaust
-Fuel smell/fuel inside balance tube and intake manifold
-Random misfire/bucking at any given rpm, and gets worse with more load
-weird noise around fuel rail when spinning cas by hand

My answer is a bad O-ring or fuel rail seal. I cannot tell which one went bad, but there is my finding! Hope this helps someone in the future !

     
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