Check Engine Light +
 

So when I was going to leave work I noticed that the check engine light was on as soon as I started the car. Worried me a little bit but nothing to get to worked up about.

As I was driving home I noticed that the gear revving felt a little wierd. There was some lag when trying to accelerate. Also when I was sitting in neutral I would rev it up to say 4k RPMs, release the gas and the RPMs would come down normally and it would then suddenly stop at 1500 then slowly drop down and idle at 1100.

Is 1100 a normal idle for everyone else?

I'm not sure if this means much I just feel like something is wrong. Any suggestions would be greatly appreciated. Only mod I have is the Stillen Gen3s.

-Nevers

Mine did the exact same thing....the gas cap was loose.

Yeah this happend with my sentra last year. Tighten up your gas cap.

Normal idle would be around 800 to 900 rpm without mods.

Wow, really?! I turn off the engine light on cars all day at my shop for having a loose gas cap, but never has it caused a running problem:confused: I'm glad this thread was here to enlighten me!

I tightened the gas cap, filled the tank, drove it probably 5 miles and the light is still on. Hopefully it will go off after a little more driving

Could always take it to autozone if it remains on and use the scanner to get the code. (it's free)

Just take to the dealer, is under warranty. Unless he has some mods that are creating the check engine light...then that is different.

Ill probably take it to autozone first.

What do you think the chance that the gen3s are causing the light?

You'd be the first..

You also might look into a cheap code reader.. with the range they can read these days, you'll probably end up using it more than you think.. or find a buddy with one.

That being said, you could also check the installation.. if you somehow had a loose silicone connection or something, and bringing in unmetered air, that would definitely do it.

Is it a check engine light (CEL) or a service engine soon (SES) light?

Ahhh the blessings of having a car with warranties!

How long ago were they installed? If they were installed for awhile and your car JUST got the CEL, I doubt it would be the gen3's.

If you installed recently it could be the MAF Sensor got a little dirt in it during installation. That could cause RPM's to act up.

P0300 multiple random misfires. I'm gonna reset the ECU see if it comes back. Any other advice?

OBD-II Trouble Code: P0300 Random/Multiple Cylinder Misfire Detected

P0300 - Check Engine Light Diagnostic Trouble Code Description

Basically it seems that almost anything can trigger that code. I'd say just reset it and see what happens

i'd reset it and see if it comes back. its kind of a fluke thing, but that code can be triggered all of a sudden and not return. it's triggering happens mostly on start up.

^^^ There are a lot of things that can make that code throw. If it comes back take it to the dealership.

**** so I reset it back on the 20th, and it came back today this time p0305, Cylinder 5 misfire! WTF!

Anyway I have an appt to take it in tomorrow bright and early to the dealership, any advice or words of what to expect from tomorrow? What should or shouldnt I do?

Thanks

Im having the same prob. My car is throwing a p0300 too. I had reset it but it came back.

Any update on these P0300 code?

The OP started another thread here: http://www.the370z.com/nissan-370z-g...al-purple.html

I idle at 600. Anything higher than that and the car is cold or ur idling high

my check engine light came on also but this was after I checked my oil and water in my radiator could it be due to that also I left the hood up for an entire night and put water in my radiator any help would be great thanks

Highly unlikely any of that caused a CEL. Go get the code scanned and we can help diagnose it further.

maybe try the unhooking the battery trick, cures alot of ailments

It'll clear the code, but if the code is indicative of a larger issue you won't know what's going on with the car. Get the code scanner and figure out what you're dealing with, then clear it.

Codes should clear once the issue is resolved. Check your air filter and all the intake connections. Mine threw misfire codes when my intake was adjusted by the dealer and it was found falling off. Stillen intake, 2010

Killing the power to the ECM is what I would consider an all-else-has-failed option. As per Chuck33079, any DTCs will be cleared, plus, the ECM will have to relearn the engine and the emissions system will not pass until you have made several trips.

It doesn't hurt anything, so give it a try if you like. But grab the DTCs before you do.