TwinTurbo.NET: Nissan 300ZX forum - Hard starting and fuel in upper plenum after injector swap
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Subject Hard starting and fuel in upper plenum after injector swap
     
Posted by Wisc300Z on March 15, 2011 at 8:41 PM
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Message I replaced all six injectors with Venom injectors after a couple stock injectors went bad after 100K. Did the work myself and initially had two seated poorly and hydro-locked the engine and filled the exhaust with fuel. After replacing o-rings on the two injectors and burning off the raw fuel from the exhaust things ran fine for a week. Then noticed some fuel smell after driving and re-pulled two injectors and reseated them as I noticed a bit of seepage on the top of the injectors.

Since then after driving 30 miles and letting the Z sit all day it starts hard and the exhaust smells a bit rich. I've replaced the plugs with stock NKGs and have noticed when I pulled the balance tube there is some fuel visible in the upper plenum. Not sure if this is normal and/or a problem. Wondering if dampeners could be suspect now. If the car sits for several days it seems to start fine.

I've had it to the shop and they were no help. Looking for any suggestions as the snow is melting and I'm eager to get this resolved. Worst case would be replacing all the injectors with stock as I had no problems prior.

Thanks for any input.

     
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