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.
Friday, June 17th, 2022 AT 10:53 AM

5 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,754 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
Was this
answer
helpful?
Yes
No
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.
Was this
answer
helpful?
Yes
No
Saturday, June 18th, 2022 AT 2:45 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,754 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

Was this
answer
helpful?
Yes
No
Saturday, June 18th, 2022 AT 10:33 PM
Tiny
FYZOOL KHAN
  • MEMBER
  • 3 POSTS
Will double check the compression and let you know.
Was this
answer
helpful?
Yes
No
Sunday, June 26th, 2022 AT 4:44 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,754 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
Was this
answer
helpful?
Yes
No
Sunday, June 26th, 2022 AT 9:22 PM

Please login or register to post a reply.

Sponsored links