P0300 / Engine RPM speed @ idle

cheshirecat · 03-27-2013, 10:38 AM

Quote:

Originally Posted by Jordo!

Really?
If so then it's bad misfire detection logic in the ECU.
Is it more common in earlier models?

It doesn't happen more in different years that I know of- it seems to be broadly related to the intake design of the HR motor (both 35 and 37). I wouldn't say it's bad detection logic as much as the engine just sensing more air (lean mixture) that could cause a possible misfire condition.

IMO, this code is much less severe than the actual misfire code that specifies a cylinder. In that case, I would look at the connectors for the coil packs as well as the coil packs themselves for the specific cylinder specified in the code.

It personally doesn't make sense to me that the Stillen (or really any) intake triggers these codes so people automatically assume something is suddenly damaged or that a sensor has failed somehow.

IMO, in these cases where the intake is installed and the code just starts popping up, there's just more air getting into the engine which passes a pre-programmed threshold which then trips the code. That's just my guess- please don't take it as a definitive conclusion for why so many people experience this issue.

cg2006 · 04-22-2013, 04:50 AM

Quote:

Originally Posted by 1littlekerr

Bought a 09 370z nismo in Jan with a Stillen gen 3 intake. It has been throwing error code P0300 multi misfire in cylinder according to the dealer every time it rains, 6 times since Jan. Dealer thinks its a Intake issue and Stillen says its a vacuum leak or defective EGR. When I hammer on her from first to second she hesitates as though my foot is off the gas, then catches up and goes. Anyone else run into this issue? Tired of the damn check engine light turning on and the run around from the dealer. Should i take her to get tuned? Any help would be greatly appreciated!

I'm having the exact same issues after getting my Stillen CAI installed this weekend. How did you fix it or does anyone have any suggestions? The car sits at 1K RPM, hammering off the line in first; very slow off the line and the car hesitates for a moment before kicking in, and Service Engine Soon light is constantly on.

I checked all the pipes and tightened all the clamps. My engine also has a fast ticking sound coming from the engine. I don't remember it sounding like that when I first bought it last month. It is still under warranty and I highly doubt within a few weeks that it would be spark plugs. It definitely seems like the Stillen is at fault. I'm debating taking it off bc my car is definitely slower >3K RPMs.

cheshirecat · 04-22-2013, 10:32 AM

The ticking is just your injectors. You can reset the ECU and clear the code with the following:

1. Push start button twice to get - Ignition "ON", count to 3.
2. Depress/Release pedal 5 times - hard and fast.
3. Count to 10 (not 7!) and fully depress pedal.
4. Count to 12 (SES should be blinking), release pedal.
5. Count to 10, depress pedal.
6. Count to 10, release pedal.
7. Turn off ignition, then start engine. ECU reset is done!

cg2006 · 04-22-2013, 01:25 PM

Did that procedure. First time it worked but next day it came back on, idles high, slow hesitant start off line, feels sluggish. Tried procedure next couple of days over 50x, light will not go off even after a successful procedure.

Wantom · 11-26-2013, 06:05 PM

Quote:

Originally Posted by jareau

I had same issue. Cleaned my Stillen Gen 3's, issue disappeared.

what do you mean cleaned it???like took the whole intake off and cleaned the inside and the filters????or you mean like the maf sensors???

Wantom · 11-26-2013, 06:09 PM

I'm having the same issues..... its only happening now since its cold..... i think I'm just gonna get her tuned and stop worrying about it haha...

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04-22-2013, 10:32 AM	#18 (permalink)
cheshirecat A True Z Fanatic Join Date: Jan 2009 Location: Florida Posts: 1,428 Drives: N54 135i Rep Power: 292	The ticking is just your injectors. You can reset the ECU and clear the code with the following: 1. Push start button twice to get - Ignition "ON", count to 3. 2. Depress/Release pedal 5 times - hard and fast. 3. Count to 10 (not 7!) and fully depress pedal. 4. Count to 12 (SES should be blinking), release pedal. 5. Count to 10, depress pedal. 6. Count to 10, release pedal. 7. Turn off ignition, then start engine. ECU reset is done!

04-22-2013, 01:25 PM	#19 (permalink)
cg2006 Enthusiast Member Join Date: Mar 2013 Location: NJ Posts: 269 Drives: Your Girl Wild! Rep Power: 12	Did that procedure. First time it worked but next day it came back on, idles high, slow hesitant start off line, feels sluggish. Tried procedure next couple of days over 50x, light will not go off even after a successful procedure.

11-26-2013, 06:09 PM	#21 (permalink)
Wantom Base Member Join Date: Jan 2013 Location: Virginia Posts: 63 Drives: 2011 silver manual Rep Power: 12	I'm having the same issues..... its only happening now since its cold..... i think I'm just gonna get her tuned and stop worrying about it haha...