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Misfiring, code P0301

Tiny
FYZOOL KHAN
  • MEMBER
  • 2006 NISSAN WINGROAD
  • 1.5L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 135,000 MILES
P0301 code, cylinder one. I replaced ignition coils, spark plugs, injectors, air flow, cam, crank and oxygen sensors. I did a compression test the reading is good, check cylinder 1, both ignition coils and injector harness getting voltage, ground and continuity between the Jack's to the ECU. No intake vacuum leaks. I also tried another ECU as well. I completely removed the catalytic converter years ago. A while back I had an issue with the fuel pump so I replaced it together with fuel filter some months back. After all this the car still misfiring and showing a code p0301. Any other advise I will be thankful.
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Friday, June 17th, 2022 AT 10:53 AM

5 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Hi,

First, please understand this vehicle isn't offered in the US, but I will try my best to help.

Have you confirmed there is spark at the plug? If not, please do that even though the wiring tests are good. Here is a link that shows how that is done:

https://www.2carpros.com/articles/how-to-check-for-ignition-spark

If that checks good, compression is good, and there are no leaks, it sounds like a faulty fuel injector. Have you checked to make sure it is getting power from the ECM?

Take a look through this link. You may find it helpful.

https://www.2carpros.com/articles/how-to-test-a-fuel-injector

Let me know if any of this helps. Also, let me know if the miss is always present or if it only happens randomly.

Take care,

Joe
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Friday, June 17th, 2022 AT 8:45 PM
Tiny
FYZOOL KHAN
  • MEMBER
  • 3 POSTS
Thanks, Mr Joe, yes, I am getting spark at the plugs, injectors were replaced. I am getting power, ground and I did a continuity test from the signal wire by the Jack's of the no1 injector an ignition coil to the ECM all is good. Missing always when idling and when pulling off I am getting a hesitation, otherwise the car running great an good speed.
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Saturday, June 18th, 2022 AT 2:45 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Hi,

The next thing to check would be engine compression. If there is a variation between cylinders of more than 10%, it can cause a misfire. Usually, it is felt most at idle unless there is a big difference.

Here is a link that explains how it's done:

https://www.2carpros.com/articles/how-to-test-engine-compression

You will need a compression gauge, but most auto part stores will lend one to you. Let me know if you are comfortable performing this test.

Take care,

Joe

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Saturday, June 18th, 2022 AT 10:33 PM
Tiny
FYZOOL KHAN
  • MEMBER
  • 3 POSTS
Will double check the compression and let you know.
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Sunday, June 26th, 2022 AT 4:44 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Hi,

That sounds like a plan. Let me know what you find or if there is anything I can do to help.

Take care,

Joe
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Sunday, June 26th, 2022 AT 9:22 PM

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