75 280z manual

Fuel Injectors Pulsating Too Fast and Flooding Engine

Fuel pressure is 30-35 (appropriate)

When fuel line is clamped off, engine will run til existing gas is depleted. However, when fuel is allowed to be injected at the rate the injectors are pulsating, it floods the engine.

ECU?

My guess would be you've got a cracked reluctor or other problem in your distributor pickup so the ECM is seeing double the # of rpm's it should. Can you swap distributors with someone just to see if problem goes away?

Wait a minute, 280z....is it electronic ignition like the ZX, or points? Got your gap (or dwell) set correctly?

Btw, how did you confirm they're pulsating "too fast?" Did you put a stethoscope on them and those on a similar vehicle?

75 280z manual

Fuel Injectors Pulsating Too Fast and Flooding Engine

Fuel pressure is 30-35 (appropriate)

When fuel line is clamped off, engine will run til existing gas is depleted. However, when fuel is allowed to be injected at the rate the injectors are pulsating, it floods the engine.

ECU?

I have never heard of "injectors pulsing to fast" on a FI Z. perhaps running to rich due to any number of factors including, bad wiring, bad water temp sensor, thermotime switch, stuck CSI, malfuctioning AFM, or TPS.

Edit: bad FPR? did you test after it? is the vacuum line to it fuctioning?

Edited July 13, 201212 yr by grantf

Already swapped with new distributor ... Not the solution.

Is electronic ignition

Confirmed pulse of injectors with a Noid Light

You should be getting one injector pulse per engine revolution. Are you getting more than that?

Try hooking up a timing light and a noid light. The noid light should flash twice as often as the timing light. This will be easiest to confirm when you're cranking the engine.