Weak injector pulse
Posted 22 March 2017 - 01:49 PM
Posted 22 March 2017 - 05:50 PM
Also check the grounds for your ECU, intake manifold, and make sure you are getting a full 12v going to the injector itself.
Is it just low power during cranking or is it not running at all?
Posted 22 March 2017 - 06:45 PM
Verify good constant current when ignition is on. If good, ground the other lead to a good ground, that should fire the injector as long as you hold it grounded. It should dump fuel if the pump is running.
There is also a resistor pack on the radiator core support under the air box, check connections there, but that's not a common fail item. They should measure about 3 ohms each lead to the common lead.
Posted 22 March 2017 - 07:09 PM
Posted 28 March 2017 - 02:19 PM
Posted 28 March 2017 - 08:33 PM
Did you do a resistance check on your injector resistor box?
I had an ECU go bad due to a leaky heater core. It ran down the under glove box panel and onto my ECU connector. That's the only instance I have ever had of a SQ ECU failing. I know that the 3000GTs have issues where capacitors on the board burst causing ECU failure.
Do you also have spark? Have you checked ignition coil resistance and made sure it had battery voltage at the ignition coil?
Lastly just because the injector clicked when you activated it does not mean the injector is good. Check injector resistance. I would also try swaping the injector connections and see if it will spray fuel from the secondary injector.
Posted 29 March 2017 - 02:57 PM
Posted 07 April 2017 - 03:01 PM
Posted 07 April 2017 - 06:25 PM
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Posted 07 April 2017 - 06:52 PM
Posted 07 April 2017 - 07:34 PM
Posted 12 April 2017 - 05:19 AM
If you have 6 ohms on each wire that is double the resistance causing less current to make it to the injector. Think of like there being a kink in a garden hose with the injector being a spray nozzle. If you needed X amount of water to come out, but there is a kink less water will come out.
I would recommend running new injector wires for the whole fuel injector circuit. You could have corrosion or short to ground somewhere. Use the FSM and redo the wiring to match the original layout.
Posted 16 April 2017 - 09:26 AM
Posted 16 April 2017 - 11:04 AM
Posted 17 April 2017 - 05:59 PM
I think Chad was saying that each injector itself is supposed to be 2-3 ohms. I asked if you had gotten 6 ohms on the wires. That is my bad. Any wire should have less than 2 ohms of resistance for it to work properly. Ideally less than 1 ohm.
The resistor box itself also has specific ratings for how much it should ohm out to.
You could have bad injectors, a bad resistor box (unlikely as I haven't ever seen a bad one unless someone else has), or a wiring issue.
Like stated before the ECU controls the grounds. Meaning the ground circuit for the injectors goes directly to the ecu. You can always run new wires from the injector clips behind the motor and inside the car. Then run a crimp splice and see if it fixes the issue. If it fixes your concern you'll know that there was high resistance in the ground circuit for the injectors and then clean up the wire install. Otherwise you'll have to look at other possible failures.
Edited by Turbo Cary, 17 April 2017 - 06:03 PM.
Posted 19 April 2017 - 03:16 PM
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