Service engine soon...

WELL ZED · 02-22-2017, 08:13 AM

So yesterday morning I started the Z and the "service engine soon" light came on and the car was idle around 1000 RPM. I took it to a local auto shop and they said that I need to take it to Nissan for an "idle relearn". Has anybody had this issue? Also, I believe I still have the extended warranty through Nissan(security plus), I wonder if it'll be covered. Probably not but I thought I would ask. If it helps at all, it was giving a random misfire code (P0300). Ark Grip exhaust is the only aftermarket mod on the car. I tried to find a previous thread about this but no luck.

Thanks!

Chuck33079 · 02-22-2017, 08:48 AM

P0300 is a major pain in the ***. It seems to be the ecu's catch-all code for anything that confuses it. Assuming maintenance is up to date, plugs are good and MAF/TBs are clean, I'd clear it out with your OBD tool and see if it comes back. If it's a legit misfire, there would be another code calling out a specific cylinder.

SouthArk370Z · 02-22-2017, 09:23 AM

What Chuck33079 said. Most modern cars are very good at self-diagnosis, but they're still not perfect. Hook up a code reader, check for DTCs and pending DTCs (write them down, if present), clear DTCs, see what happens.

If car is still idling high after resetting DTCs, several DIYs have been posted on idle relearn. If you can't find one using the site's search, try any web search engine and add "site:the370z.com" to your search string. The high idle makes me think the problem may be with one of the TBs - hopefully it was just a glitch and won't crop up again.

If the P0300 reappears, then it's probably time to clean MAFs and TBs, check plugs, etc (or visit a mechanic).

The FSM is an invaluable resource for trouble-shooting the 370Z. Link in my sig.

demoz34 · 12-30-2022, 09:29 PM

Quote:

Originally Posted by SouthArk370Z

What Chuck33079 said. Most modern cars are very good at self-diagnosis, but they're still not perfect. Hook up a code reader, check for DTCs and pending DTCs (write them down, if present), clear DTCs, see what happens.

If car is still idling high after resetting DTCs, several DIYs have been posted on idle relearn. If you can't find one using the site's search, try any web search engine and add "site:the370z.com" to your search string. The high idle makes me think the problem may be with one of the TBs - hopefully it was just a glitch and won't crop up again.

If the P0300 reappears, then it's probably time to clean MAFs and TBs, check plugs, etc (or visit a mechanic).

The FSM is an invaluable resource for trouble-shooting the 370Z. Link in my sig.

What if I've cleaned and repositioned throttle bodies, cleaned MAF sensors, replaced pcv valves, spark plugs and ignition coils and still have the code and high idle

TreeSemdyZee · 12-30-2022, 09:40 PM

Quote:

Originally Posted by demoz34

What if I've cleaned and repositioned throttle bodies, cleaned MAF sensors, replaced pcv valves, spark plugs and ignition coils and still have the code and high idle

Just curious. Have you checked your oil level?
I overfilled mine a few years ago and the idle went nuts.
I had to do a long drain of the oil due to the air bubbles in the oil.

Averying · 12-31-2022, 06:57 AM

Quote:

Originally Posted by demoz34

What if I've cleaned and repositioned throttle bodies, cleaned MAF sensors, replaced pcv valves, spark plugs and ignition coils and still have the code and high idle

Exhaust leaks and 02 sensors would be two things worth checking as well.

Sent from my iPhone using Tapatalk

Natrix · 01-03-2023, 12:57 AM

Quote:

Originally Posted by demoz34

What if I've cleaned and repositioned throttle bodies, cleaned MAF sensors, replaced pcv valves, spark plugs and ignition coils and still have the code and high idle

Welcome to the P0300 club!

Feel free to take a look at my diagnosis for the same issue, and maybe we can learn from one another: The P0300 Saga

Chuck33079 · 02-22-2017, 09:34 AM

The high idle is a result of the P0300. For some reason the ECU bumps up the idle when it pops that code. Once the code is cleared the idle should go back to normal.

SouthArk370Z · 02-22-2017, 11:46 AM

Quote:

Originally Posted by Chuck33079

The high idle is a result of the P0300. For some reason the ECU bumps up the idle when it pops that code. Once the code is cleared the idle should go back to normal.

Thanks for clearing that up. Should make OPs job a lot easier.

WELL ZED · 02-22-2017, 01:24 PM

Thanks to you both

TreeSemdyZee · 02-22-2017, 10:18 PM

My idle went real high last year, between 1100 and 1200 rpm. I pulled the negative battery cable for about 20 minutes and the reconnected. Idle back to normal.

nis350 · 02-23-2017, 01:35 AM

I was under the impression that disconnecting the battery doesn't reset the ECU and/or clear the code/condition?

Quote:

Originally Posted by TreeSemdyZee

My idle went real high last year, between 1100 and 1200 rpm. I pulled the negative battery cable for about 20 minutes and the reconnected. Idle back to normal.

02-22-2017, 08:13 AM	#1 (permalink)
WELL ZED Base Member Join Date: May 2016 Location: Northern Virginia Posts: 83 Drives: #822 40th Rep Power: 9	Service engine soon... So yesterday morning I started the Z and the "service engine soon" light came on and the car was idle around 1000 RPM. I took it to a local auto shop and they said that I need to take it to Nissan for an "idle relearn". Has anybody had this issue? Also, I believe I still have the extended warranty through Nissan(security plus), I wonder if it'll be covered. Probably not but I thought I would ask. If it helps at all, it was giving a random misfire code (P0300). Ark Grip exhaust is the only aftermarket mod on the car. I tried to find a previous thread about this but no luck. Thanks! Last edited by WELL ZED; 02-22-2017 at 08:20 AM.

02-22-2017, 08:48 AM	#2 (permalink)
Chuck33079 A True Z Fanatic Join Date: Nov 2011 Location: Houston Posts: 12,265 Drives: 2011 370ztt Rep Power: 29539	P0300 is a major pain in the ***. It seems to be the ecu's catch-all code for anything that confuses it. Assuming maintenance is up to date, plugs are good and MAF/TBs are clean, I'd clear it out with your OBD tool and see if it comes back. If it's a legit misfire, there would be another code calling out a specific cylinder. SouthArk370Z and WELL ZED like this. __________________ 2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent

02-22-2017, 09:23 AM	#3 (permalink)
SouthArk370Z Premium Member Join Date: Nov 2010 Location: South Arkansas Posts: 8,435 Drives: 2014 Challenger Rep Power: 324198	What Chuck33079 said. Most modern cars are very good at self-diagnosis, but they're still not perfect. Hook up a code reader, check for DTCs and pending DTCs (write them down, if present), clear DTCs, see what happens. If car is still idling high after resetting DTCs, several DIYs have been posted on idle relearn. If you can't find one using the site's search, try any web search engine and add "site:the370z.com" to your search string. The high idle makes me think the problem may be with one of the TBs - hopefully it was just a glitch and won't crop up again. If the P0300 reappears, then it's probably time to clean MAFs and TBs, check plugs, etc (or visit a mechanic). The FSM is an invaluable resource for trouble-shooting the 370Z. Link in my sig. WELL ZED likes this. __________________ Steering Lock Links - Search The370Z Bookmarklet - FSM @ NICOclub Mankind has progressed past the need for war but we haven't evolved that far. - NachoMahma

02-22-2017, 09:34 AM	#8 (permalink)
Chuck33079 A True Z Fanatic Join Date: Nov 2011 Location: Houston Posts: 12,265 Drives: 2011 370ztt Rep Power: 29539	The high idle is a result of the P0300. For some reason the ECU bumps up the idle when it pops that code. Once the code is cleared the idle should go back to normal. phunk, SouthArk370Z and falicfr like this. __________________ 2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent

02-22-2017, 10:18 PM	#11 (permalink)
TreeSemdyZee Premium Member Join Date: Dec 2009 Location: Kentuck-IANA Age: 60 Posts: 4,886 Drives: '09 370 & ‘14 Juke Rep Power: 27409	My idle went real high last year, between 1100 and 1200 rpm. I pulled the negative battery cable for about 20 minutes and the reconnected. Idle back to normal. __________________ Borla S-Type \| Motordyne \| Z1 (lots) \| South Bend \| K&N \| Nismo/Nismo S-Tune \| Eibach \| Aerojacket \| Fujimara \| Spl \| ZSpeed Performance \| Kenwood-Infinity-Sound Ordnance \| Whiteline \| Ecutek \| Hotchkis \| Clazzio \| VQ Vortex \|Morimoto XB \|Dynosty Tune 329.64hp 265.73 ft/lb

02-22-2017, 01:24 PM	#10 (permalink)
WELL ZED Base Member Join Date: May 2016 Location: Northern Virginia Posts: 83 Drives: #822 40th Rep Power: 9	Thanks to you both

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Service Engine Soon	Zatanna Z	Engine & Drivetrain	6	02-05-2017 05:11 AM
Service Engine Soon	The BlueMax	Nissan 370Z General Discussions	15	01-22-2015 08:18 PM
Service Engine Soon	Keithbeeesh	Nissan 370Z General Discussions	23	11-17-2014 09:05 AM
service engine soon...	ddvette9	Nissan 370Z General Discussions	17	07-15-2010 09:00 AM
HELP!!!! Service engine light came on	tru_Asiatik	Engine & Drivetrain	31	04-15-2009 07:38 PM