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Forum: Engine & Drivetrain

01-08-2023, 01:13 PM

Replies: 15

The P0300 Saga

Views: 1,756

Posted By Natrix

Update Yesterday, I took apart the bank 1...

Update
Yesterday, I took apart the bank 1 intake to inspect the throttle body valve. Everything looked fine, and it was moving freely. Just to be sure, I wiped the surfaces clean with some...

Forum: Engine & Drivetrain

01-06-2023, 01:58 AM

Replies: 15

The P0300 Saga

Views: 1,756

Posted By Natrix

Update I decided none of the other items in the...

Update
I decided none of the other items in the rough idle symptom table were likely causes, so I put the UIM back on with a new gasket. Before installing, I carefully cleaned the LIM surface with...

Forum: Engine & Drivetrain

01-03-2023, 10:06 AM

Replies: 15

The P0300 Saga

Views: 1,756

Posted By Natrix

This person replaced the flywheel, clutch, slave...

This person replaced the flywheel, clutch, slave cylinder, and CKP (crankshaft position sensor), and claims the issue was resolved for them:
...

Forum: Engine & Drivetrain

01-03-2023, 09:52 AM

Replies: 15

The P0300 Saga

Views: 1,756

Posted By Natrix

Thanks for the suggestion. I will take a look...

Thanks for the suggestion. I will take a look once the fuel level is lower (I just filled up recently, and it's at about 90% full).

Forum: Engine & Drivetrain

01-03-2023, 12:52 AM

Replies: 15

The P0300 Saga

Views: 1,756

Posted By Natrix

Further down the rabbit hole...another thread...

Further down the rabbit hole...another thread linked in one I already posted. This one involves Nissan buying back someone's Z because they couldn't figure it out, Nissan engineers adding ground...

Forum: Engine & Drivetrain

01-03-2023, 12:18 AM

Replies: 15

The P0300 Saga

Views: 1,756

Posted By Natrix

Link to another thread related to P0300 on cold...

Link to another thread related to P0300 on cold starts:

http://www.the370z.com/engine-drivetrain/44411-p0300-cold-mornings.html

One person there reported a failed bearing related to oil system...

Forum: Engine & Drivetrain

01-03-2023, 12:11 AM

Replies: 15

The P0300 Saga

Views: 1,756

Posted By Natrix

Update Last night and today, I pulled off the...

Update
Last night and today, I pulled off the upper intake manifold and checked power and ground to each fuel injector connector, then confirmed that each injector resistance was within spec. All...

Forum: Engine & Drivetrain

01-02-2023, 11:55 AM

Replies: 15

The P0300 Saga

Views: 1,756

Posted By Natrix

The flywheel and engine mounts are stock. That...

The flywheel and engine mounts are stock. That is good thinking, though.

Forum: Engine & Drivetrain

01-01-2023, 11:16 PM

Replies: 15

The P0300 Saga

Views: 1,756

Posted By Natrix

Thanks for the input! I did check resistance...

Thanks for the input!

I did check resistance across t3 and t4 on both upstream O2 sensors, and they were in spec. They also output the ”correct” voltage range at idle, at least according to one...

Forum: Engine & Drivetrain

01-01-2023, 06:26 PM

Replies: 15

The P0300 Saga

Views: 1,756

Posted By Natrix

This thread in our forum documents two cases...

This thread in our forum documents two cases where a faulty ECM/ECU was the cause of misfiring:

http://www.the370z.com/engine-drivetrain/130153-p0302-cylinder-misfire.html

I find it interesting...

Forum: Engine & Drivetrain

01-01-2023, 06:21 PM

Replies: 15

The P0300 Saga

Views: 1,756

Posted By Natrix

Another helpful post about P0300 diagnosis from...

Another helpful post about P0300 diagnosis from our friends over on the My350Z page: https://my350z.com/forum/maintenance-and-repair/379042-rough-idle-and-po300-code.html

Forum: Engine & Drivetrain

01-01-2023, 05:53 PM

Replies: 15

The P0300 Saga

Views: 1,756

Posted By Natrix

Related Links Accel pedal position, throttle...

Related Links
Accel pedal position, throttle valve position, and idle air volume relearning walkthrough: https://www.youtube.com/watch?v=HIiaF0VaTlQ (also found on page EC-14 in FSM)

OBD II PID...

Forum: Engine & Drivetrain

01-01-2023, 05:49 PM

Replies: 15

The P0300 Saga

Views: 1,756

Posted By Natrix

The P0300 Saga

I decided it was time to document this issue that my 370Z has had ever since I purchased it back in 2019. I hope others with the same problem find it helpful in some way. The issue has yet to be...

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