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Tech Talk Technical Discussion About The Nissan 240SX and Nissan Z Cars |
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01-22-2017, 03:53 PM | #1 |
Leaky Injector
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Sr20det cylinder 2 not firing
Hi everyone, so I go to start my car and notice the engine shaking violently and I can feel it throughout the car. I started diagnosing and pinpointed it to cylinder 2 not firing by unplugging the coilpack and seeing no change. Changed the coil pack and still no luck. The previous owner installed the engine by cutting/soldering the engine harness instead of getting the plug and play harness. I've had plans to buy a new harness and I think it may be time now, however, I would like to make sure it is a wiring issue, whether it be the coil pack sub harness or main harness. Any suggestions on how to go about this?
Thanks for your help. Update 1/23: All cylinders have 12v power. As for ecu signal: C1 - .35 C2 - .12 C3 - .15 C4 - .25 Last edited by ZenkiDK; 01-23-2017 at 04:03 PM.. |
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01-22-2017, 05:29 PM | #4 |
Nissanaholic!
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Test signal from ecu to the pin for the coil pack
Ensure you're getting power to the plug and group it good.
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01-22-2017, 09:23 PM | #5 |
Post Whore!
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Move cyl 2 coil to a different one and see if the symptom folllows. That will rule out coil
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01-22-2017, 09:30 PM | #6 | |
Zilvia Addict
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step one: buy a multimeter
step two: learn how to use it Sounds like 5v ECU signal is not reaching C2.
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01-23-2017, 03:34 PM | #7 |
Leaky Injector
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01-23-2017, 04:44 PM | #8 | |
Zilvia Junkie
Join Date: Jul 2009
Location: Vancouver, B.C.
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Quote:
I concur, should have the same reading throughout if wiring is good.
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ig : koukimonst3r |
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01-23-2017, 10:32 PM | #9 |
Nissanaholic!
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Check for the signal where the main harness plugs into the coilpack sub harness. That will tell you if it is main harness or coil pack harness.
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01-23-2017, 10:43 PM | #10 | |
Zilvia Addict
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I would go through all the signal wires, C2 & C3 look suspect. Since you already tested the coil pack plug on the sub harness, test in 5 more places.
ECU plug Input of the ignitor Output side of the ignitor Engine harness of the coil pack plug Sub harness side of the coil pack plug Record any voltage as you work your way towards the coils.
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01-24-2017, 07:41 AM | #11 |
Premium Member
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have you already ensured that the cylinder has good compression and that the injector is firing, and that the plug is in good condition as well?
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02-04-2017, 06:49 AM | #15 |
Zilvia FREAK!
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02-07-2017, 04:54 PM | #16 |
Leaky Injector
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Alright guys, just ran some tests and I'm more confused.
Firstly, I tested for spark and its there. However, while plugged into the engine, I removed coil pack 2 harness and it still made no difference, whereas unplugging the others makes the engine stumble and run rough. Secondly, I tested the injectors by using the screw driver trick and all of them are clicking. Any ideas what I should do next? |
02-07-2017, 06:03 PM | #17 |
Zilvia FREAK!
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Did you try moving the coil pack to another cylinder and trying the test again? That will point to either a bad coil (if problem moves) or possibly wiring or something else.
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02-08-2017, 01:02 PM | #18 |
Zilvia Junkie
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next you should test compression. if it has compression then you'll have to pull the fuel rail and injector and make sure that injector is working.
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