SR20 Ponderous no spark on one coil. HELP - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Radkins · 07-31-2023, 04:55 PM

So I am getting no spark on any coil connected to the front pistons harness. I have swapped coils, checked the voltages and ground while running. Getting ground on black and 12v on the other 2 wires via a test light that pokes in the wires. I cleaned the connector and verified it is passing ground and voltage to the pins in the connector. What am I missing? I am getting the same readings on all 4 cylinders but the front simply won't spark. I can take the same coil out and plug it into a different location and it sparks. Seriously confused.

e1_griego · 07-31-2023, 11:01 PM

Could be the Cam Angle Sensor or could the be the ECU.

kanyedian · 08-01-2023, 07:51 AM

I would also check the ground on the battery, make sure it's fully charged, and check your fuses. I couldn't get my car started a few weeks ago and I dived so deep into cam sensor, crank sensors, a million fuel tech ECU settings, and all I needed was to replace a 15A fuse and she fired. Good Luck!

AMD 240 · 08-01-2023, 08:09 AM

I had similar issue with 1 coil not firing, ended up being the coil pack harness.

Radkins · 08-02-2023, 08:19 AM

Would the cam sensor cause only 1 coil not to spark?

Also, why am I getting the same voltage readings on the one that doesn't spark as all the others. Ground on black, 12v on the other 2.

Radkins · 08-02-2023, 08:20 AM

How do I go about checking the ecu?

e1_griego · 08-02-2023, 08:44 AM

It sounds like you checked for continuity. The CAS sends signal to the ECU which in turns fires the injectors and coilpacks.

You can throw a known working CAS at the plug and spin it and it will fire off the cylinders.

I had a CAS drop two injectors in a fresh swap and went round and round checking wiring before figuring out it was the CAS itself not sending signals.

You need noid lights to really test for the signal as a conventional test light won't fire in time.

Radkins · 08-02-2023, 10:17 AM

Quote:

Originally Posted by e1_griego

It sounds like you checked for continuity. The CAS sends signal to the ECU which in turns fires the injectors and coilpacks.

You can throw a known working CAS at the plug and spin it and it will fire off the cylinders.

I had a CAS drop two injectors in a fresh swap and went round and round checking wiring before figuring out it was the CAS itself not sending signals.

You need noid lights to really test for the signal as a conventional test light won't fire in time.

Does the SR20 pull the trigger to ground?

Is there a way to test the CAS?

07-31-2023, 04:55 PM	#1
Radkins Join Date: Oct 2007 Location: IN Age: 49 Posts: 21 Trader Rating: (0) Feedback Score: 0 reviews	SR20 Ponderous no spark on one coil. HELP So I am getting no spark on any coil connected to the front pistons harness. I have swapped coils, checked the voltages and ground while running. Getting ground on black and 12v on the other 2 wires via a test light that pokes in the wires. I cleaned the connector and verified it is passing ground and voltage to the pins in the connector. What am I missing? I am getting the same readings on all 4 cylinders but the front simply won't spark. I can take the same coil out and plug it into a different location and it sparks. Seriously confused. __________________ Recording School

08-01-2023, 08:09 AM	#4
AMD 240 Leaky Injector Join Date: Apr 2005 Location: Lombard Illinois Age: 36 Posts: 125 Trader Rating: (0) Feedback Score: 0 reviews	I had similar issue with 1 coil not firing, ended up being the coil pack harness. __________________

08-02-2023, 08:19 AM	#5
Radkins Join Date: Oct 2007 Location: IN Age: 49 Posts: 21 Trader Rating: (0) Feedback Score: 0 reviews	Would the cam sensor cause only 1 coil not to spark? Also, why am I getting the same voltage readings on the one that doesn't spark as all the others. Ground on black, 12v on the other 2. __________________ Recording School

08-02-2023, 08:20 AM	#6
Radkins Join Date: Oct 2007 Location: IN Age: 49 Posts: 21 Trader Rating: (0) Feedback Score: 0 reviews	How do I go about checking the ecu? __________________ Recording School

07-31-2023, 11:01 PM	#2
e1_griego Post Whore! Join Date: Sep 2004 Location: Independence, Ore. Age: 39 Posts: 2,711 Trader Rating: (24) Feedback Score: 24 reviews	Could be the Cam Angle Sensor or could the be the ECU.

08-01-2023, 07:51 AM	#3
kanyedian Zilvia Junkie Join Date: Apr 2019 Location: Clearwater, FL Age: 34 Posts: 342 Trader Rating: (0) Feedback Score: 0 reviews	I would also check the ground on the battery, make sure it's fully charged, and check your fuses. I couldn't get my car started a few weeks ago and I dived so deep into cam sensor, crank sensors, a million fuel tech ECU settings, and all I needed was to replace a 15A fuse and she fired. Good Luck!

08-02-2023, 08:44 AM	#7
e1_griego Post Whore! Join Date: Sep 2004 Location: Independence, Ore. Age: 39 Posts: 2,711 Trader Rating: (24) Feedback Score: 24 reviews	It sounds like you checked for continuity. The CAS sends signal to the ECU which in turns fires the injectors and coilpacks. You can throw a known working CAS at the plug and spin it and it will fire off the cylinders. I had a CAS drop two injectors in a fresh swap and went round and round checking wiring before figuring out it was the CAS itself not sending signals. You need noid lights to really test for the signal as a conventional test light won't fire in time.