Injector ticking at "ON" position - Nissan : Datsun ZCar forum :Nissan Z Forum: 240Z to 370Z
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post #1 of 10 (permalink) Old 10-14-2019, 09:22 PM Thread Starter
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Injector ticking at "ON" position

What could cause injector to operate when key is at 'ON' position?
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post #2 of 10 (permalink) Old 10-15-2019, 12:52 AM
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Originally Posted by Do Tran View Post
What could cause injector to operate when key is at 'ON' position?
when the key is in 'on' that would be when the engine is running - the injectors should be running at that point

1978 280z - stock L28 engine - Dallas, TX
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post #3 of 10 (permalink) Old 10-15-2019, 02:00 AM
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Unless he means at "ON" before "START".

I wonder, Mr.Tran (or is it Mr.Do?), are you sure it's injectors? If so, is it all or just one?



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post #4 of 10 (permalink) Old 10-19-2019, 12:36 AM Thread Starter
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I mean the injector is spraying at key ON before START. I also notice today the fuel pump is not running for 5 second at first turn ON too. I need to check the fuel pump relay but is having a hard time removing the glove box to get to the fuel pump relay. Any tips on removing the glove box is greatly appreciated.
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post #5 of 10 (permalink) Old 10-19-2019, 01:47 AM
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I'm confused. Are we talking about all the injectors? That is, are all clicking at "ON", before "START"?

That would be interesting as (someone jump in if I'm off base here) none should be firing by just turning the key to "ON".

Incidentally, the fuel pump does not begin until the key is turned to "START".



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post #6 of 10 (permalink) Old 10-19-2019, 12:44 PM Thread Starter
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Yes, look like all injectors are ticking when key is at ON position before START. Page EF38 of the 1981 Turbo Supplement stated Fuel pump should be running for 5 second when key is at ON position before START.
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post #7 of 10 (permalink) Old 10-19-2019, 01:18 PM
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Your ECU is definitely faulty. (And, yes the turbo ECU (ECCS) does "prime" the fuel line by running the fuel pump for approximately 5 seconds at ignition ON, and then resumes full fuel pump operation as long as it's getting a CAS signal that the engine is turning.)

The ECCS has complete control of the fuel pump relay. IF the fuel pump is operational, AND it's wiring is operational, AND the fuel pump relay is operational, THEN the fault is in the ECU. At ignition ON, there is no requirement other than power for the ECU to "prime" the fuel system.

There are other "markers" that your ECU is faulty - Injectors firing with no CAS signal is the biggest, and the LED is another.

1974 "early" 260Z - L28ET - MS3X full sequential fuel and spark, COP=Ford 4.6 coilpacks w/ Nissan Ignitor, diyautotune chopper wheel - FMIC - T04E .63 A/R - 400cc Injectors (too big!), 14point7 Spartan2 Wideband - C/R 5-speed - Coilovers - Big Brake Kit up front, Porterfield friction all around. Mesa, AZ
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post #8 of 10 (permalink) Old 10-19-2019, 11:41 PM
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"1981 Turbo"

Now, that's a bit of info that would have been helpful from the start.

By responding without it, I have aptly demonstrated the Principle of Ass-u-me.

With it, I defer to Mr.sheen.



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post #9 of 10 (permalink) Old 10-20-2019, 06:41 PM
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Quote:
Originally Posted by ensys View Post
"1981 Turbo"

Now, that's a bit of info that would have been helpful from the start.
Yup...

1974 "early" 260Z - L28ET - MS3X full sequential fuel and spark, COP=Ford 4.6 coilpacks w/ Nissan Ignitor, diyautotune chopper wheel - FMIC - T04E .63 A/R - 400cc Injectors (too big!), 14point7 Spartan2 Wideband - C/R 5-speed - Coilovers - Big Brake Kit up front, Porterfield friction all around. Mesa, AZ
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post #10 of 10 (permalink) Old 10-20-2019, 11:53 PM Thread Starter
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Quote:
Originally Posted by ensys View Post
"1981 Turbo"

Now, that's a bit of info that would have been helpful from the start.

By responding without it, I have aptly demonstrated the Principle of Ass-u-me.

With it, I defer to Mr.sheen.
My apology. I should of listed the year and model of my car.
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