Code P0300

Josies370z · 04-24-2019, 11:58 PM

hey guys

any updates on this? i recently starting throwing the same code. 2010 370z 70000 miles with berk hfc, stillen G3, and nismo exhaust with a Ecutek tune are the only mods currently. Clutch/flywheel replaced at approx 50,000 (CSC failed, tune and clutch/flywheel done at Specialty Z). It was running fine until about a week ago when it threw a code. idle is slightly rough but seems to run ok but i can tell its slightly off. check engine flashes and remains on and at one point would flash and disappear but now its just on all the time. changed the spark plugs with oem plugs, cleaned both TB's, didnt make a difference. My next moves are to clean the MAF's and re-inspect the plugs. Guy at the auto store said to check the gaps of the plugs and the coil connections that they may not be making good contact and recommended the contact gel they have, i wasnt sold on the 2 things he mentioned as im assuming the plugs would be pretty accurate from the dealer, possibly the coils but would be a hard to determine. Dont know where to go from there so im looking for any input?? thanks!!

Duci22 · 06-03-2019, 11:36 AM

Recently had my engine rebuilt, the after install it started to throw the infamous P0300 code. Of course the thought was something was not put back together correctly within the engine. After checking several things...plugs, injectors, coil packs, cam sprockets, O2 sensors. I found the the fuel pump assembly had completely come apart in the tank. After replacing the fuel pump and clearing the code, the code is gone. Idles perfect and runs smooth without throwing the code.

JSON · 01-24-2021, 12:21 AM

Quote:

Originally Posted by Josies370z

hey guys

any updates on this? i recently starting throwing the same code. 2010 370z 70000 miles with berk hfc, stillen G3, and nismo exhaust with a Ecutek tune are the only mods currently. Clutch/flywheel replaced at approx 50,000 (CSC failed, tune and clutch/flywheel done at Specialty Z). It was running fine until about a week ago when it threw a code. idle is slightly rough but seems to run ok but i can tell its slightly off. check engine flashes and remains on and at one point would flash and disappear but now its just on all the time. changed the spark plugs with oem plugs, cleaned both TB's, didnt make a difference. My next moves are to clean the MAF's and re-inspect the plugs. Guy at the auto store said to check the gaps of the plugs and the coil connections that they may not be making good contact and recommended the contact gel they have, i wasnt sold on the 2 things he mentioned as im assuming the plugs would be pretty accurate from the dealer, possibly the coils but would be a hard to determine. Dont know where to go from there so im looking for any input?? thanks!!

Sounds like my issue. Any updates on fixing this?

06-03-2019, 11:36 AM	#2 (permalink)
Duci22 Base Member Join Date: Mar 2012 Location: Austin, TX Posts: 77 Drives: 2010 370z MB SP AT Rep Power: 14	Possible Fix for P0300 Recently had my engine rebuilt, the after install it started to throw the infamous P0300 code. Of course the thought was something was not put back together correctly within the engine. After checking several things...plugs, injectors, coil packs, cam sprockets, O2 sensors. I found the the fuel pump assembly had completely come apart in the tank. After replacing the fuel pump and clearing the code, the code is gone. Idles perfect and runs smooth without throwing the code. casper370z likes this. __________________ 2010 370z Monterey Blue 7sp AT Touring Sport Invidia Gemini CBE // Invidia TP // Swift Spec-R // H&R Spacers // Stillen 25R Cooler 2010 Galaxy Black Platinum Armada

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04-24-2019, 11:58 PM	#1 (permalink)
Josies370z Base Member Join Date: Jul 2016 Location: South Washington Posts: 81 Drives: 2010 370z Rep Power: 9	hey guys any updates on this? i recently starting throwing the same code. 2010 370z 70000 miles with berk hfc, stillen G3, and nismo exhaust with a Ecutek tune are the only mods currently. Clutch/flywheel replaced at approx 50,000 (CSC failed, tune and clutch/flywheel done at Specialty Z). It was running fine until about a week ago when it threw a code. idle is slightly rough but seems to run ok but i can tell its slightly off. check engine flashes and remains on and at one point would flash and disappear but now its just on all the time. changed the spark plugs with oem plugs, cleaned both TB's, didnt make a difference. My next moves are to clean the MAF's and re-inspect the plugs. Guy at the auto store said to check the gaps of the plugs and the coil connections that they may not be making good contact and recommended the contact gel they have, i wasnt sold on the 2 things he mentioned as im assuming the plugs would be pretty accurate from the dealer, possibly the coils but would be a hard to determine. Dont know where to go from there so im looking for any input?? thanks!!