P0300 cold mornings?

1slow370 · 10-23-2011, 11:24 AM

Anyone else in colder climates experiencing a p0300 random multiple cylinder misfire in the mornings/at night? I get a constant ses light code P0300 and the freeze frame data points to cold startups water temp 72deg, 1272rpm, 0mph, 5% throttle. Car starts runs and drives fine think the battery might be going as the voltgauge is reading 11.8 volts before I start it.

Daishi · 10-24-2011, 07:04 AM

I've seen cases where a bad injector causes this. though usually there's another fault for a specific injector.

JAYNO20 · 11-14-2012, 02:45 AM

Ever figure anything out with this? I am having the same issue on cold nights after work...

370Z JT · 11-14-2012, 03:18 AM

Are you running a cold air intake?

Jordo! · 11-14-2012, 04:38 AM

I think this is common, and due entirely to ECU logic in detecting misfires -- especially if random.

If you have uprev, you can change a few settings to make it less likely to set off (crank drag, DTS off).

JAYNO20 · 11-14-2012, 10:59 AM

Quote:

Originally Posted by 370Z JT

Are you running a cold air intake?

Yes I am. Gen 3's

SouthArk370Z · 11-14-2012, 12:35 PM

P0300 - Random Misfire

Indicates multiple cylinders are misfiring or the ECM cannot identify which cylinder is misfiring.

Possible Causes:
Camshaft position sensor (CMP)
Low fuel (less than 1/8 tank)
Stuck open EGR valve

YMMV

JAYNO20 · 11-14-2012, 01:39 PM

Quote:

Originally Posted by SouthArk370Z

P0300 - Random Misfire

Indicates multiple cylinders are misfiring or the ECM cannot identify which cylinder is misfiring.

Possible Causes:
Camshaft position sensor (CMP)
Low fuel (less than 1/8 tank)
Stuck open EGR valve

YMMV

Full tank of gas... how would I test the other two?

JAYNO20 · 11-14-2012, 01:42 PM

Also never saw this cel before my cai was installed... coincidence?

Jordo! · 11-14-2012, 04:18 PM

Quote:

Originally Posted by JAYNO20

Also never saw this cel before my cai was installed... coincidence?

I'm guessing in your case its a lean miss from either a vacuum leak or the MAF sensor readings are off from the CAI.

If the former, you just have to trace it down; if the latter, only a tune (or turning off the DTS code trip option via uprev) can fix it.

370Z JT · 11-14-2012, 06:40 PM

The P0300 Cel I had occurred right after a rain storm both times. Idle was rough as well. The next morning the Cel was gone. I suspect wet filters from my Gen 3? Perhaps some rain water reached the filters while parked. I no longer drive in heavy rain storms.

JAYNO20 · 11-14-2012, 06:53 PM

Quote:

Originally Posted by 370Z JT

The P0300 Cel I had occurred right after a rain storm both times. Idle was rough as well. The next morning the Cel was gone. I suspect wet filters from my Gen 3? Perhaps some rain water reached the filters while parked. I no longer drive in heavy rain storms.

I am thinking about getting sine hydro shields to prevent that.

SouthArk370Z · 11-14-2012, 07:05 PM

Quote:

Originally Posted by JAYNO20

Full tank of gas... how would I test the other two?

Diagnostic, repair, and maintenance info are in the FSMs if you want to DIY. Otherwise it means a trip to the mechanic.

Since you have installed a CAI, I would investigate in that direction first.

1slow370 · 11-29-2012, 01:14 AM

Haha wow an old one of mine i never updated in my case it was a disintegrated engine bearing due to oil system failure and the amount of banging the crank was doing was triping knock sensor so it THOUGHT it was misfiring. Then the crud plugged the cam actuators and 2months and three trips to the dealer later new motor.

ENT-Z · 11-29-2012, 07:07 PM

Quote:

Originally Posted by 1slow370

Haha wow an old one of mine i never updated in my case it was a disintegrated engine bearing due to oil system failure and the amount of banging the crank was doing was triping knock sensor so it THOUGHT it was misfiring. Then the crud plugged the cam actuators and 2months and three trips to the dealer later new motor.

Damn! I sure hope that's not what is going on with my car (currently in the shop investigating this same code and not finding anything). Was your idle higher when the code came on then went back to normal when it went off? That's what mine does.

10-23-2011, 11:24 AM	#1 (permalink)
1slow370 A True Z Fanatic Join Date: Aug 2009 Location: In the D Posts: 3,732 Drives: v8 74 260z ;) Rep Power: 7250	P0300 cold mornings? Anyone else in colder climates experiencing a p0300 random multiple cylinder misfire in the mornings/at night? I get a constant ses light code P0300 and the freeze frame data points to cold startups water temp 72deg, 1272rpm, 0mph, 5% throttle. Car starts runs and drives fine think the battery might be going as the voltgauge is reading 11.8 volts before I start it. __________________ ANSWER PRICE LIST Answers - - - - - - - - - - - - - - - - $0.75 Answers (requiring thought) - - - - $1.25 Answers (correct) - - - - - - - - - - $12.50

10-24-2011, 07:04 AM	#2 (permalink)
Daishi Track Member Join Date: Jul 2009 Location: NJ Posts: 683 Drives: 09 370z 6Speed Rep Power: 16	I've seen cases where a bad injector causes this. though usually there's another fault for a specific injector. __________________ Cobb Tuned \| Injen Intakes \| Fast Intentions Long Tube Headers \| Fast Intentions TDX Catback 18" Resonators CF Mufflers \| Tommy Kaira Hebi Bebi Shift Knob \| 19x9.5/19x10.5 Five Axis Design S5:F w/ 245/40/19 - 285/35/19 Hankook Ventus V12's

11-14-2012, 02:45 AM	#3 (permalink)
JAYNO20 Track Member Join Date: Mar 2012 Location: Pittsburgh, PA Posts: 802 Drives: 2010 370Z Nismo Rep Power: 14	Ever figure anything out with this? I am having the same issue on cold nights after work... __________________ 2010 Solid Red NISMO #0334 - SOLD 2014 Red Hot Camaro ZL1

11-14-2012, 03:18 AM	#4 (permalink)
370Z JT A True Z Fanatic Join Date: Jan 2010 Location: United States Posts: 2,905 Drives: 370Z PW 7AT Rep Power: 378	Are you running a cold air intake? __________________ Click for My Journal Top Secret \| EVO-R \| Fujimura Auto \| Shine Auto \| Seibon \| MRWorks \| Swift \| SPC \| SSR \| UpRev \| Project Kics \| NST \| Titek \| Eibach \| Nismo \| Whiteline \| Quaife \| Invidia \| Fly1 \| CF Element \| Carbon Signal

11-14-2012, 04:38 AM	#5 (permalink)
Jordo! A True Z Fanatic Join Date: May 2010 Location: nirvana Posts: 6,394 Drives: 2023 NATM Rep Power: 417	I think this is common, and due entirely to ECU logic in detecting misfires -- especially if random. If you have uprev, you can change a few settings to make it less likely to set off (crank drag, DTS off). __________________ Enjoy it. Destroy it. Last edited by Jordo!; 11-14-2012 at 12:30 PM.

11-14-2012, 12:35 PM	#7 (permalink)
SouthArk370Z Premium Member Join Date: Nov 2010 Location: South Arkansas Posts: 8,435 Drives: 2014 Challenger Rep Power: 324197	P0300 - Random Misfire Indicates multiple cylinders are misfiring or the ECM cannot identify which cylinder is misfiring. Possible Causes: Camshaft position sensor (CMP) Low fuel (less than 1/8 tank) Stuck open EGR valve YMMV __________________ Steering Lock Links - Search The370Z Bookmarklet - FSM @ NICOclub Mankind has progressed past the need for war but we haven't evolved that far. - NachoMahma

11-14-2012, 01:42 PM	#9 (permalink)
JAYNO20 Track Member Join Date: Mar 2012 Location: Pittsburgh, PA Posts: 802 Drives: 2010 370Z Nismo Rep Power: 14	Also never saw this cel before my cai was installed... coincidence? __________________ 2010 Solid Red NISMO #0334 - SOLD 2014 Red Hot Camaro ZL1

11-14-2012, 06:40 PM	#11 (permalink)
370Z JT A True Z Fanatic Join Date: Jan 2010 Location: United States Posts: 2,905 Drives: 370Z PW 7AT Rep Power: 378	The P0300 Cel I had occurred right after a rain storm both times. Idle was rough as well. The next morning the Cel was gone. I suspect wet filters from my Gen 3? Perhaps some rain water reached the filters while parked. I no longer drive in heavy rain storms. __________________ Click for My Journal Top Secret \| EVO-R \| Fujimura Auto \| Shine Auto \| Seibon \| MRWorks \| Swift \| SPC \| SSR \| UpRev \| Project Kics \| NST \| Titek \| Eibach \| Nismo \| Whiteline \| Quaife \| Invidia \| Fly1 \| CF Element \| Carbon Signal

11-29-2012, 01:14 AM	#14 (permalink)
1slow370 A True Z Fanatic Join Date: Aug 2009 Location: In the D Posts: 3,732 Drives: v8 74 260z ;) Rep Power: 7250	Haha wow an old one of mine i never updated in my case it was a disintegrated engine bearing due to oil system failure and the amount of banging the crank was doing was triping knock sensor so it THOUGHT it was misfiring. Then the crud plugged the cam actuators and 2months and three trips to the dealer later new motor. __________________ ANSWER PRICE LIST Answers - - - - - - - - - - - - - - - - $0.75 Answers (requiring thought) - - - - $1.25 Answers (correct) - - - - - - - - - - $12.50

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