Fuel Injector Knocking weird issue - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

JohnnyDrfiter22 · 04-24-2016, 09:20 PM

My #4 Fuel Injector started kncoking. I swapped them around same one. I can tell it's knocking because I disconnect the connector and it stops. Correct me if I am wrong I tested continuity at the Injector connector and at the #4 fuel Injector driver at the ECU pin out. From what I understand both wires at the Injector should have continuity but only 1 does. I'm running a AEM V2 so I can't just swap ECUs. Any help would be appreciated

JohnnyDrfiter22 · 04-27-2016, 06:54 PM

hmm 80 views and no one knows about injector drives and continuity?

quickdiversion · 04-27-2016, 07:02 PM

I do not know much about then AEM I will look into to it.

Here is the thing. Injectors are simple. One wire is common or ground, the other is the voltage. So you will only have continuity on 1 wire when checking it against grouse with a volt meter. The other wire that is reading open on the voltage meter when using ohms is voltage. Switch the dial to DC Volts with the key in the on position but not running. See what the voltage is if any.

You can look up a video on YouTube in 30 secondary how to check your fuel Injectors with a multimeter.

You need to dig a little deeper and give more information when asking for help, makes it easier for us.

jedi03 · 04-27-2016, 09:43 PM

You are sure it'd the injector and not the coil or the valves?

quickdiversion · 04-27-2016, 10:00 PM

I was going to ask the same question, but he said if he disconnects the fuel Injector it stops so I moved on.

A knock is pre or post detonation, meaning fuel is ignited to early or to late. If you really want to try something. Swap the #4 coil with a different cylinder see if it follows. If it does than its the coil. If not I would look at the ignitor.

There are videos how to test nissan coils on YouTube.

04-24-2016, 09:20 PM	#1
JohnnyDrfiter22 Zilvia Addict Join Date: Apr 2008 Location: New Jersey Age: 38 Posts: 670 Trader Rating: (0) Feedback Score: 0 reviews	Fuel Injector Knocking weird issue My #4 Fuel Injector started kncoking. I swapped them around same one. I can tell it's knocking because I disconnect the connector and it stops. Correct me if I am wrong I tested continuity at the Injector connector and at the #4 fuel Injector driver at the ECU pin out. From what I understand both wires at the Injector should have continuity but only 1 does. I'm running a AEM V2 so I can't just swap ECUs. Any help would be appreciated

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04-27-2016, 06:54 PM	#2
JohnnyDrfiter22 Zilvia Addict Join Date: Apr 2008 Location: New Jersey Age: 38 Posts: 670 Trader Rating: (0) Feedback Score: 0 reviews	hmm 80 views and no one knows about injector drives and continuity?

04-27-2016, 07:02 PM	#3
quickdiversion Zilvia Junkie Join Date: Aug 2012 Location: nj Age: 38 Posts: 341 Trader Rating: (4) Feedback Score: 4 reviews	I do not know much about then AEM I will look into to it. Here is the thing. Injectors are simple. One wire is common or ground, the other is the voltage. So you will only have continuity on 1 wire when checking it against grouse with a volt meter. The other wire that is reading open on the voltage meter when using ohms is voltage. Switch the dial to DC Volts with the key in the on position but not running. See what the voltage is if any. You can look up a video on YouTube in 30 secondary how to check your fuel Injectors with a multimeter. You need to dig a little deeper and give more information when asking for help, makes it easier for us.

04-27-2016, 09:43 PM	#4
jedi03 Nissanaholic! Join Date: Jul 2008 Location: albuquerque Posts: 1,784 Trader Rating: (8) Feedback Score: 8 reviews	You are sure it'd the injector and not the coil or the valves?

04-27-2016, 10:00 PM	#5
quickdiversion Zilvia Junkie Join Date: Aug 2012 Location: nj Age: 38 Posts: 341 Trader Rating: (4) Feedback Score: 4 reviews	I was going to ask the same question, but he said if he disconnects the fuel Injector it stops so I moved on. A knock is pre or post detonation, meaning fuel is ignited to early or to late. If you really want to try something. Swap the #4 coil with a different cylinder see if it follows. If it does than its the coil. If not I would look at the ignitor. There are videos how to test nissan coils on YouTube.