Unknown check engine oh boy

Wuero370z · 04-08-2019, 04:10 PM

Well I got the dreaded p0300 code a couple weeks ago and though nothing of it. Just reset my ECU and went on my way. Only for the light to come back on the next day. Reset the ecu again. I know I know. The check engine light means somethings wrong and you should pay attention but the car was running fine. Once again reset it and it came back. Went under the hood and turns out an intake like had came off. (In reality I probably forgot to connect it when I cleaned the throttle bodies). Now the car drives and runs fine. The code only comes on AFTER I drive it and park it. Once I park it and come back to stat the car. The code is back.... with a high idle now. The car seems to idle around 1100/1200 when the code is on and doesn’t run perfectly. Any ideas? I don’t wanna waste my money and time replacing things that won’t help... I’ve read all the threads already so no need to link them. No one really found a solution to this. Oil is current as well as good gas and air filter. Any help would be appreciated

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JARblue · 04-08-2019, 04:14 PM

You've reset the ECU since reinstalling the intake, right?

BettyZ · 04-08-2019, 04:40 PM

Hard reset. Disconnect both battery poles and let it sit overnight

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Wuero370z · 04-08-2019, 04:58 PM

Quote:

Originally Posted by JARblue

You've reset the ECU since reinstalling the intake, right?

I have. I will also try the hard reset as soon as I get home

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SouthArk370Z · 04-08-2019, 06:47 PM

After an ECM reset, the engine will run rough until the ECM relearns. Go for a 10-15 drive at varying speeds/loads.

04-08-2019, 04:10 PM	#1 (permalink)
Wuero370z Enthusiast Member Join Date: Nov 2018 Location: Albuquerque Posts: 358 Drives: 2013 Nissan 370z Rep Power: 6716	Unknown check engine oh boy Well I got the dreaded p0300 code a couple weeks ago and though nothing of it. Just reset my ECU and went on my way. Only for the light to come back on the next day. Reset the ecu again. I know I know. The check engine light means somethings wrong and you should pay attention but the car was running fine. Once again reset it and it came back. Went under the hood and turns out an intake like had came off. (In reality I probably forgot to connect it when I cleaned the throttle bodies). Now the car drives and runs fine. The code only comes on AFTER I drive it and park it. Once I park it and come back to stat the car. The code is back.... with a high idle now. The car seems to idle around 1100/1200 when the code is on and doesn’t run perfectly. Any ideas? I don’t wanna waste my money and time replacing things that won’t help... I’ve read all the threads already so no need to link them. No one really found a solution to this. Oil is current as well as good gas and air filter. Any help would be appreciated Sent from my iPhone using Tapatalk

04-08-2019, 04:14 PM	#2 (permalink)
JARblue A True Z Fanatic Join Date: Mar 2011 Location: Austin, TX Age: 43 Posts: 36,449 Drives: 11 Z34, 98 E36 M3 Rep Power: 2684440	You've reset the ECU since reinstalling the intake, right? BettyZ likes this. __________________ 2011 370Z 6MT Sport Gun Metallic \| ARC \| CJM \| Ecutek \| FI \| Fujimura \| R2C \| SPL \| Stillen \| TWM \| Z1 \| ZSpeed \|

04-08-2019, 04:40 PM	#3 (permalink)
BettyZ A True Z Fanatic Join Date: Aug 2018 Location: Chicagoland Age: 37 Posts: 5,261 Drives: A Garage Queen Rep Power: 2684370	Hard reset. Disconnect both battery poles and let it sit overnight Sent from my SM-G955U using Tapatalk crazy4oldcars likes this. __________________ '14 MB Nismo \| Boost Lab 6870 1.32 AR 553 HP / 471 ft.-lbs. Betty Mods

04-08-2019, 06:47 PM	#5 (permalink)
SouthArk370Z Premium Member Join Date: Nov 2010 Location: South Arkansas Posts: 8,435 Drives: 2014 Challenger Rep Power: 324197	After an ECM reset, the engine will run rough until the ECM relearns. Go for a 10-15 drive at varying speeds/loads. __________________ Steering Lock Links - Search The370Z Bookmarklet - FSM @ NICOclub Mankind has progressed past the need for war but we haven't evolved that far. - NachoMahma

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