Engine problem - p0300 - Whats the fix?
 

Help!!!
I just bought a used 2009, MT, sport package, w/ 35000 miles about a month ago.
Started her up one cold morning (about 30 degrees) and the service engine soon light came on immediately.
So i bought a code reader off of Amazon and it read p03000.

I was able to clear the code.
Havent been able to drive it yet cause its been snowing here... :(
I did let it idle to normal operating temperature and the light didnt come back on.

Should I be worried? What if it comes back on?
Please help.

Code : P0300 may also be accompanied by a 301-312. the number after the 3 indicated the misfiring cylinder

Definition : Random/Multiple Cylinder Misfire Detected

Symptom : Check Engine Light Illuminated and engine misfire, may also detect loss of power or hesitation while accelerating

Cause : The engine will set this code when a misfire is repeatedly detected.

Repair : Replace the failed component on that particular cylinder. Most commonly the Coil Pack

Damage if not repaired : Engine damage to the cylinders rings and damage to the catalytic converter from raw fuel not being burned, not to mention the poor performance and fuel mileage.

When you pull the check engine light codes and p0300 pops up you may ask yourself, What do I do now? See if there is an additional code such as p0302. The number that follows the 3 ( 02 in this case) identify's the problem cylinder. So the problem would be in the number 2 cylinder and in most cases can be cured by replacing the coil pack.

I suggest repairing the problem so in the future if your car has an additional problem it can illuminate the check engine light to let you know you need to fix an issue.

I personally would wait for it to come back on one more time. Then if so change all plugs a coil pack on that perticular cylinder.

YMMV, but I bought some MAF cleaner for like 5 bucks from autozone and thoroughly cleaned the MAFs and hot-wires and it has not come on since.

http://ep.yimg.com/ca/I/rodi_2245_732852155

^ this too

Coil packs....? serious?
i just did some research on what is required to change spark plugs on the 370z and it looks like a pain in the butt.

Do you know if the strut brace needs to be removed, or can the plugs/coil packs be changed with it on?

Try the MAF cleaning first

Yes it had to be removed. Along with throttle bodies and I can't remember if the manifold had to be to. It's not hard. Just some time.

...update...

since erasing the code ive driven about 200 miles and the service engine soon light hasnt come back on.
everything seems perfect/normal.

It was really cold (near single digits) the morning I started it when the SES soon light came on. A fluke???..maybe the Z's dont like super cold temps.

Need to drive longer than 200 miles to really tell. Past 500 miles then you can rest easy.

^had the same issue. car sat for almost a week when it was really cold, started it up and had that code. car ran fine, cleared it out, hasn't came back since. that was over 10000 miles ago

Correct. Its my understanding that it takes 3 full drive cycles to reset the test. :shakes head:

good to hear!

Coon-azz..
I drove more than 3 driving cycles but the darn code never cleared itself. Everything sounded and operated fine so i cleared it with the code reader tool.

I think that particular code doesnt auto clear...... ? unlike what people say about the Small Emission Leak code.

I had a CEL seemingly every time I went to the track. Not during the event but just before. The first 4 times only. Weird. It was the kind from the gas cap lock. It took awhile but always reset.

OP I hope it goes well for you.

I got that code and turned it off with Uprev:tup:

If it comes back on, clean the MAF sensors like stated above. I had the same code twice since owning the Z and cleaning the sensors worked both times.

Having this issue right now myself with one difference. I am only getting the random misfire detected and no indication of a specific cylinder. While I am driving I also get my "Service Engine Soon" light flashing at me, then off for a half mile then flashing again. Got home and ran the code and it doesn't specify a cylinder. And advice would be great. Thanks :tup:


And have I lost my way, or is one coil pack really $125? :eek:

JDHeart.....when this happened to me the light was steady (not blinking). Im not sure but i think a blinking SES light is worse than a steady one.
Someone else that has had their Z longer or knows more about them can probably verify this for us.......

I keep getting this code, ever since I got my spark plugs replaced and UPREV done on it. Maybe its a bad connection to coil pack?

it's in the owners manual a blinking ses light means that the car is detecting misfire, and congratulations this is the 5000th thread about p0300! you've won the title of permanewb. p0300 is the ecu's catch all for something isn't right. there are over 5 pages of troubleshooting in the factory service manual on it that basically referance every other chapter in the manual, so good luck fixing it.

Edit: the only real fix is to take it to 3 or 4 dealerships porbably about 10 times until they finally figure out what is wrong.

What are you talking about? I didn't post a new thread, this is an ongoing thread on the same issue and I posted a reply on it. There is no 5000th thread, yours is the worthless post. If you don't like people replying to a post ignore and move on.

not you the op do a search 5000 is an exageration but there are tons of threads about p0300, it runs everything in the book from bad tank of gas to plugged cam timing actuators, to a coroded connectors, to a blown engine mount, bad bearings, burned coils, a f'd up ecu, plugged air filters, weak fuel pump, stuck injectors, I personally had a bad thrust bearing and the vibration from the crank was causing it, to bad o2's to dirty mafs to almost anything else on the car, the only way to reliably get it fixed is to keep taking it to the dealership until it is.

^ oh ok ;) I think I might try cleaning my MAF sensors since I run K&N Typhoons.

Seeing as this thread was started over a year ago, I don't think the OP gives a sh1t. :ugh2:

oh in that case guess it was a zombie thread revival.

My car is at dealer as of Saturday for blinking ses and has p300 code. Dealer is going to change plugs and coilpacks since they said the valve cover is leaking. Which I thought they fixed in November but that's another story. If I still have p300 then like people mention could need Maf cleaning or aem cAi messing with signal.

or it could be one of a thousand random other things

so that you don't have to find my posts in one of the older threads when they did mine it took 7 trips to the dealer and 4 months until I found the problem and pointed it out to them(blown thrust bearing)