I can't figure it out, maybe you guys can help?

[kz9]

Well first off my car is not a MSP.

Well I have had my car runnig for about 3 weeks now and I still have a CEL poping up. I have went though the manual many times and everything I have try has not gotten rid of this dam CEL.

P0172 - System too Rich (bank1)

Also sometimes, but not everytime I get a P0300 or P0304. Typical misfire CEL's

Now using my wideband and datalogging it, I can't find where the mofo is going TOO rich. I have tried cold and hot starts and the same frezze frame data comes up.

Fuel System 1 - closed loop

Calculated Load - 27.4%

Engine Coolant Temp - Can be cold or hot

Short Term Fuel Trim (Bank 1) - -6.2%

Long Term Fuel Trim (bank 1) - -25.0%

Engine RPM - 791 rpm

Vehicle Speed - 0 mph

Ignition Timing - (-4.0 deg) this is different every time

Intake Air Temp - 86 deg (depends on weather)

Mass Air Flow Sensor - 000.49 lb/min

TPS - 17.6%

If I get a Misfire, the above is the same FF data.

I have tried pulling LOTS of fuel, and advancing my timing, but no matter what, this still happens. And I mean I'm WAY lean.



So what should I check for? Keep in mind that it is a new OEM o2 sensor and new Innovate WB, that is calibrated.

Thanks

Kellan

[kz9]

Ok, well after I posted this I looked into my problem a bit more. I think I know now what its is.

After letting my foot off the gas in netural, I go rich. I think its suposed to go lean?

The only thing is that the frezze frame data does not match when i am rich.

[Alejo_NIN]

u seem to know alot so don't get offended...
but
have you checked the coils, sparkplugs and sparkplug wires?
also, maybe injectors are bad
bad fuel pump
clogged fuel filter
bad o2 sensor

please, don't be offended if you did

[Fudgie]

Whats your fuel pressure?

[kz9]

Not offended at all.

I have checked all those things.

New wires and plugs
Coil impedence is within range
Injectors are JDM sti ones (pink) --- could be the problem, but I idle fine
Fuel pump is new (walbro 255)
Fuel filter -if it was clogged I would have a hard time putting fuel in at higher needs and thats not the case.
o2 has only 2k at most on it, seems to read fine, but at $150+ for the sensor from Mazda, I'm not going to rush out to buy one.

Thanks for making me think about those points and referencin my notes again.

Keep them coming, I'm willing to check anything again.

I'm going to pull my plugs again to check them for timing and color.

[kz9]

Whats your fuel pressure?

I was at 50psi at idle, and I knew that was high. So I put it back to stock range (36psi-39psi) and still have an issue.

[BOOSTR]

Just throwing these out: check your header/exhaust mounting bolts for tightness and also the intake manifold bolts as unmetered air could throw both of those codes.

[Alejo_NIN]

it could very well be an injector...
failing at a high rate..

can you swap them out?

[kz9]

it could very well be an injector...
failing at a high rate..

can you swap them out?

Its not failing at high rate. This code happens at idle. Duty iirc is only 60 or 70%. I have to pull from -15 to -30 on my fuel maps.

I can swap them out and put in my 440's. But lets let this thread stew for awhile cause I am getting a good response.

[kz9]

Just throwing these out: check your header/exhaust mounting bolts for tightness and also the intake manifold bolts as unmetered air could throw both of those codes.

All tight. no Vac leaks ethier. I did a propane test.

Good point tho!

[jamesk]

you running a egr?

[kz9]

Its hooked up with a breather. But if it was that I would be lean not rich, cause I would be letting in unmetered air. I don't get a EGR CEL.

Still a good point. I think I might put a cap on it and see if I throw the code again.

[jamesk]

i would figure a egr would make you run rich because of the excessive carbon build up it adds to the combustion chamber. plus you also said it happens at idle

[kz9]

i would figure a egr would make you run rich because of the excessive carbon build up it adds to the combustion chamber. plus you also said it happens at idle

Not hooked up to the exhaust.

[Fudgie]

What are you using for an ems and what size injectors? How are you able to determine idc?

[kz9]

E-manage and 525cc JDM sit injectors (pinks)

[Fudgie]

EGR adds inert air to the mix specifically to cool down the combustion chamber temps thus reducing NOx emissions. EGR being activated at idle would cause misfires along with a position code.

[Fudgie]

Sounds like the stock ecu is trying to be where it wants to be and can't compensate enough for that injector without getting pissed. Running 440's with the dsm afc my idle fuel trims were roundabout -18.

[kz9]

Misfire's only happen sometimes. Its a rich misfire.

[Fudgie]

You could always tighten up your plug gap and see what happens........

[kz9]

I'm gonna try and lean out my decel curve. I'm looking at the realtime data/map trace and the decel curve could be leaned out a bit more. I'm gonna try that tomorrow.

It might be the FF data thats off a bit. It says 17.6% TPS, and that sure is not decel.

[kz9]

You could always tighten up your plug gap and see what happens........


I could try that. But it runs fine.

[Fudgie]

Except for the misfire codes??

[kz9]

too much fuel, im going to check my plugs now

[kz9]

nvrmind still warm. I'll check tomorrow.