Sr20det red top. No injector pulse on two cylinders. - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Sweds13 · 11-20-2020, 09:58 AM

The car only runs on two cylinders. Gets spark fine on all. Swapped injectors, same cylinders that don't run. Ohms good on all injectors. Continuity from ecu plug to the injectors on all, so the cables aren't broken.

My conclusion is that it's not getting a proper pulse. Anybody got a idea of what could be the problem.

Thanks in advance!

*e1_griego* · 11-20-2020, 10:16 AM

I've had a bad CAS cause that problem.

Sweds13 · 11-21-2020, 03:59 AM

Quote:

Originally Posted by e1_griego

I've had a bad CAS cause that problem.

But wouldn't that affect spark as well?

*e1_griego* · 11-21-2020, 08:30 AM

I seem to remember that's the same problem I was having.

You can use a noid light (or some LED) to test for signal from the CAS to the ECU. If it's not the CAS it's probably the ECU. Or find an extra CAS and plug it in and spin it and listen for clicks from the injectors.

Sweds13 · 11-22-2020, 03:00 AM

Quote:

Originally Posted by e1_griego

I seem to remember that's the same problem I was having.

You can use a noid light (or some LED) to test for signal from the CAS to the ECU. If it's not the CAS it's probably the ECU. Or find an extra CAS and plug it in and spin it and listen for clicks from the injectors.

Yeah I'll do that, thanks! But regarding noid lights/led do I need a resistor? I mean the injectors are 11ohm

cotbu · 11-24-2020, 03:54 AM

Make sure you have battery voltage 1st, its the simplest to check and repair. KOEO
From there you can do any of the other test, spin cas, manual trigger, etc.

11-20-2020, 09:58 AM	#1
Sweds13 Join Date: Nov 2020 Location: Stockholm Posts: 8 Trader Rating: (0) Feedback Score: 0 reviews	Sr20det red top. No injector pulse on two cylinders. The car only runs on two cylinders. Gets spark fine on all. Swapped injectors, same cylinders that don't run. Ohms good on all injectors. Continuity from ecu plug to the injectors on all, so the cables aren't broken. My conclusion is that it's not getting a proper pulse. Anybody got a idea of what could be the problem. Thanks in advance!

11-24-2020, 03:54 AM	#6
cotbu Post Whore! Join Date: Sep 2005 Location: SWFL Age: 47 Posts: 3,318 Trader Rating: (3) Feedback Score: 3 reviews	Make sure you have battery voltage 1st, its the simplest to check and repair. KOEO From there you can do any of the other test, spin cas, manual trigger, etc. __________________ LoverTechnologies "Half Broken Things!"

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11-20-2020, 10:16 AM	#2
e1_griego Premium Member Join Date: Sep 2004 Location: Independence, Ore. Age: 36 Posts: 2,642 Trader Rating: (24) Feedback Score: 24 reviews	I've had a bad CAS cause that problem.

11-21-2020, 08:30 AM	#4
e1_griego Premium Member Join Date: Sep 2004 Location: Independence, Ore. Age: 36 Posts: 2,642 Trader Rating: (24) Feedback Score: 24 reviews	I seem to remember that's the same problem I was having. You can use a noid light (or some LED) to test for signal from the CAS to the ECU. If it's not the CAS it's probably the ECU. Or find an extra CAS and plug it in and spin it and listen for clicks from the injectors.