Question about 1992 Nissan 240SX Fastback
Just a suggestion, but get a fuel pressure gauge and check your pressure regulator. They use intake vacuum to control a diaphram that regulates the fuel based on RPM/vacuum relationship. I had a Supra with a similar problem - had all the mechanics stumped. It was flooding in #1 and # 2 cyl. badly. Turns out rubber diaphram in pressure reg. cracked and the engine vacuum was pulling gas directly into the intake manifold on top of what the injectors were supplying! Also, lifting the regulator's vacuum line off the manifold and holding it close to the vacuum, you'll actually see gas getting sucked in if that's the problem. I took the same route you did, replaced inj. etc, before I stumbled on this. Good luck!
Posted on Sep 03, 2008
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Posted on Jan 02, 2017
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