Hy i have my rx-8 2004 GT Manual for 2 year now i d'ont regret my choice, but 1 week ago a i have a problem a got P0172 (system to rich) & P0300 (random missfire)

I have remplaced my coil,wires, plug
Cleaning the SSV
Cleaing the ESS
Cleaning Maf
I have not cat
i have also a Cai
my engine as recently changed by the dealer
i run also premix

when i start the car cold , i have a ruff idlee but at hot she very good and my missfire are between 7-8 rpm but no loss of power help me please

 

Good start on the typical items. Two things more that you can check:
- Is it your CAI that is causing the misfire/rich condition? Most of them can give problems like that
- Compression test, coolant test for combustion gasses, and oil test for coolant.

 

Care to elaborate, just curious as to why a CAI would cause a rich situation?

 

i have my cai for a long time and she run always great and my coolant is good i forgot to write it ,

 

How much premix?

 

CAI pipe diameter smaller than stock would probably be over-reporting air flow, generating a rich condition detected at the O2 sensor.

He didn't say what brand, so I was leaving it open as an option it could be. Some crappy intakes out there.

 

Wasn't aware of any CAI out their that had smaller diameter than stock, regardless good to know.

I only ask because my car is running slightly rich.

 

Yeah, I'm not specifically aware of any either, but well... I imagine they exist, especially on ebay.

 

3p I.D for the CAI

250ml per tank for the premix

 

You really made me convert that

Also its about twice as much as it should be.

 

Hmm

Rich will foul plugs. Fouled plugs will cause misfire... Vacuum leak will make it run lean, not rich.

Dirty injector that is not closing? Run a can of injector cleaner through the tank? I like Lucas, but it depends on what they have where you are.

20 petal stomp after all the work you did?

 

No vacum leak
20 stomp brake pedal with the oil gauge confirm the reset
plug clean and new new coil new wire i try injector cleanor in the fuel no change and today New cel p2097 with my old p0300 p0172

One day..... One day i will find my problem

 

I'm thinking it's the 02 Sensor. If everything was running right I would not suspect the CAI.


Try unplugging the Front 02/lambda Sensor and seeing how it runs.

 

what is the diameter of the pipe to the stock airbox or a good cai


with all your opion im nervous with my custom cai (is not a cheap job tig welded good 3 ply cuppler t-clamp) but in 3In I.D

 

tomorow i try the o2 , i have nothing to lose .... 1 month and i find anyting XD but i make a big tune up and a read a lot for try to solve my problem

my Mazda bpT Gtr megasquirt miss meee **** that was so easy XD .

 

3.375" Stock MAF ID

 

I had the same P0172 code and discovered that the nipple on the throttle body that's supposed to be plugged when a CAI is installed wasn't plugged. The plug had come off somehow. (Maybe I did it when I changed the plug wires.)
Also, smell the oil on your dipstick. Does it smell of gasoline? If so, you should do an oil change.

 

i bet for the cai , anyone have a Aem for sale and ship to canada XD

 

Im gonna burn the car........ a put stock oem box & my car run like **** but i have no more cell for missfire etcc the only i got po171 run to rich

Coil wire plug
Clean ssv
stock air box
clean maf
clean ess
clean injector
clean filter
no vacum leak
i clean all the ground

im out of idea